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Alt, Christopher ; Antičić, Tome ; Baatar, B. ; Barna, Daniel ; Bartke, Jerzy ; Betev, Latchezar ; Białkowska, Helena ; Blume, Christoph ; Boimska, Bożena ; Botje, Michiel ; Bracinik, J. ; Bramm, Roland ; Černý, Vladimír ; Christakoglou, Panagiotis ; Chung, P. ; Chvala, Ondrej ; Cramer, John G. ; Csató, Péter ; Dinkelaker, Peter ; Eckard, V. ; Flierl, Dominik Bernhard ; Fodor, Zoltán ; Foka, Panagiota ; Friese, Volker ; Gál, József ; Gaździcki, Marek ; Genchev, Vladimir ; Georgopoulos, George ; Gładysz-Dziaduś, Ewa ; Grebieszkow, Katarzyna ; Hegyi, Sándor ; Höhne, Claudia ; Kadija, Krešo ; Karev, A. ; Kikola, D. ; Kliemant, Michael ; Kniege, Stefan ; Kolesnikov, Vadim I. ; Kornaś, Ewelina ; Korus, Robert ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Laszlo, A. ; Lacey, R ; Leeuwen, Marco van ; Lévai, Péter ; Litov, Leandr ; Lungwitz, Benjamin ; Makariev, Martin ; Malakhov, Aleksandr I. ; Mateev, Matej D. ; Melkumov, Georgy L. ; Mischke, André ; Mitrovski, Michael Kosta ; Molnár, József ; Mrówczynski, Stanislaw ; Nicolic, V. ; Nicolic, G. ; Panagiotou, Apostolos D. ; Panayotov, Dobromir ; Petridis, Athanasios ; Peryt, Wiktor Stanislaw ; Pikna, Miroslav ; Pluta, Jan Marian ; Prindle, Duncan J. ; Pühlhofer, Falk ; Renfordt, Rainer Arno Ernst ; Roland, Christof ; Roland, Gunther ; Rybczyński, Maciej ; Rybicki, Andrzej ; Sandoval, Andres ; Schmitz, N. ; Schuster, Tim ; Seyboth, Peter ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Slodkowski, M. ; Stefanek, Grzegorz ; Stock, Reinhard ; Strabel, Claudia ; Ströbele, Herbert ; Šuša, Tatjana ; Szentpétery, Imre ; Sziklai, János ; Szuba, M. ; Szymanski, P. ; Trubnikov, Victor ; Varga, Dezsö ; Vassiliou, Maria ; Veres, Gábor I. ; Vesztergombi, György ; Vranić, Danilo ; Wetzler, Alexander Albert ; Włodarczyk, Zbigniew ; Wojtaszek, A. ; Yoo, In-Kwon ; Zimányi, József
The energy dependence of multiplicity fluctuations was studied for the most central Pb+Pb collisions at 20A, 30A, 40A, 80A and 158A GeV by the NA49 experiment at the CERN SPS. The multiplicity distribution for negatively and positively charged hadrons is significantly narrower than Poisson one for all energies. No significant structure in energy dependence of the scaled variance of multiplicity fluctuations is observed. The measured scaled variance is lower than the one predicted by the grand-canonical formulation of the hadron-resonance gas model. The results for scaled variance are in approximate agreement with the string-hadronic model UrQMD.
Antičić, Tome ; Baatar, B. ; Barna, Daniel ; Bartke, Jerzy ; Behler, Matthias ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blume, Christoph ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Cerny, Vladimír ; Christakoglou, Panagiotis ; Chvala, Ondrej ; Cramer, John G. ; Csató, Péter ; Darmenov, Nikolay ; Dimitrov, Anton ; Dinkelaker, Peter ; Eckardt, Volker ; Filip, Peter ; Flierl, Dominik Bernhard ; Fodor, Zoltán ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Gál, József ; Gaździcki, Marek ; Georgopoulos, George ; Gładysz-Dziaduś, Ewa ; Grebieszkow, Katarzyna ; Hegyi, Sándor ; Höhne, Claudia ; Kadija, Krešo ; Karev, Alexandre ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Korus, Robert ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lévai, Péter ; Litov, Leandr ; Makariev, Martin Vasilev ; Malakhov, Aleksandr I. ; Markert, Christina ; Mateev, Matej D. ; Mayes, Bill W. ; Melkumov, Georgy L. ; Meurer, Christine ; Mischke, André ; Mitrovski, Michael Kosta ; Molnár, József ; Mrówczyński, Stanislaw ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Panayotov, Dobromir ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Pühlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Retyk, Waldemar ; Roland, Christof ; Roland, Gunther ; Rybczyński, Maciej ; Rybicki, Andrzej ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Seyboth, Peter ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Stefanek, Grzegorz ; Stock, Reinhard ; Ströbele, Herbert ; Šuša, Tatjana ; Szentpétery, Imre ; Sziklai, János ; Trainor, Thomas A. ; Varga, Dezsö ; Vassiliou, Maria ; Veres, Gábor I. ; Vesztergombi, György ; Vranić, Danilo ; Wetzler, Alexander Albert ; Włodarczyk, Zbigniew ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimányi, József
Results are presented on event-by-event fluctuations in transverse momentum of charged particles, produced at forward rapidities in p+p, C+C, Si+Si and Pb+Pb collisions at 158 AGeV. Three different characteristics are discussed: the average transverse momentum of the event, the Phi_pT fluctuation measure and two-particle transverse momentum correlations. In the kinematic region explored, the dynamical fluctuations are found to be small. However, a significant system size dependence of Phi_pT is observed, with the largest value measured in peripheral Pb+Pb interactions. The data are compared with predictions of several models. PACS numbers: 14.20.Jn, 13.75.Cs, 12.39.-x
Alt, Christopher ; Antičić, Tome ; Baatar, B. ; Barna, Daniel ; Bartke, Jerzy ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blume, Christoph ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Černý, Vladimír ; Christakoglou, Panagiotis ; Chvala, Ondrej ; Cramer, John G. ; Csató, Péter ; Darmenov, Nikolay ; Dimitrov, Anton ; Dinkelaker, Peter ; Eckardt, Volker ; Farantatos, Gerassimos ; Flierl, Dominik Bernhard ; Fodor, Zoltan ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Gál, József ; Gaździcki, Marek ; Georgopoulos, George ; Gładysz-Dziaduś, Ewa ; Grebieszkow, Katarzyna ; Hegyi, Sándor ; Höhne, Claudia ; Kadija, Krešo ; Karev, Alexandre ; Kliemant, Michael ; Kniege, Stefan ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Kornas, Ewelina ; Korus, Robert ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lévai, Péter ; Litov, Leandr ; Lungwitz, Benjamin ; Makariev, Martin Vasilev ; Malakhov, Aleksandr I. ; Markert, Christina ; Mateev, Matey D. ; Mayes, Bill W. ; Melkumov, Georgy L. ; Meurer, Christine ; Mischke, André ; Mitrovski, Michael Kosta ; Molnár, József ; Mrówczyński, Stanislaw ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Panayotov, Dobromir ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Pühlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Richard, Agnes Carol Joanna ; Roland, Christof ; Roland, Gunther ; Rybczyński, Maciej ; Rybicki, Andrzej ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Seyboth, Peter ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Stefanek, Grzegorz ; Stock, Reinhard ; Ströbele, Herbert ; Šuša, Tatjana ; Szentpétery, Imre ; Sziklai, János ; Trubnikov, Victor ; Varga, Dezsö ; Vassiliou, Maria ; Veres, Gábor I. ; Vesztergombi, György ; Vranić, Danilo ; Wetzler, Alexander Albert ; Włodarczyk, Zbigniew ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimányi, József
Electric charge correlations were studied for p+p, C+C, Si+Si, and centrality selected Pb+Pb collisions at sqrt[sNN]=17.2 GeV with the NA49 large acceptance detector at the CERN SPS. In particular, long-range pseudorapidity correlations of oppositely charged particles were measured using the balance function method. The width of the balance function decreases with increasing system size and centrality of the reactions. This decrease could be related to an increasing delay of hadronization in central Pb+Pb collisions.
Evidence for an exotic S=-2, Q=-2 baryon resonance in proton-proton collisions at the CERN SPS
(2004)
Alt, Christopher ; Antičić, Tome ; Baatar, B. ; Barna, Daniel ; Bartke, Jerzy ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blume, Christoph ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Černý, Vladimír ; Christakoglou, Panagiotis ; Chvala, Ondrej ; Cramer, John G. ; Csató, Péter ; Darmenov, Nikolay ; Dimitrov, Anton ; Dinkelaker, Peter ; Eckardt, Volker ; Farantatos, Gerassimos ; Filip, Peter ; Flierl, Dominik Bernhard ; Fodor, Zoltán ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Gál, József ; Gaździcki, Marek ; Georgopoulos, George ; Gładysz-Dziaduś, Ewa ; Hegyi, Sándor ; Höhne, Claudia ; Kadija, Krešo ; Karev, Alexandre ; Kniege, Stefan ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Korus, Robert ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lévai, Péter ; Litov, Leandr ; Makariev, Martin Vasilev ; Malakhov, Aleksandr I. ; Markert, Christina ; Mateev, Matej D. ; Mayes, Bill W. ; Melkumov, Georgy L. ; Meurer, Christine ; Mischke, André ; Mitrovski, Michael Kosta ; Molnár, József ; Mrówczyński, Stanislaw ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Panayotov, Dobromir ; Perl, Katarzyna ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Pühlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Retyk, Waldemar ; Roland, Christof ; Roland, Gunther ; Rybczyński, Maciej ; Rybicki, Andrzej ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Seyboth, Peter ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Stefanek, Grzegorz ; Stock, Reinhard ; Ströbele, Herbert ; Šuša, Tatjana ; Szentpétery, Imre ; Sziklai, János ; Trainor, Thomas A. ; Varga, Dezsö ; Vassiliou, Maria ; Veres, Gábor I. ; Vesztergombi, György ; Vranić, Danilo ; Wetzler, Alexander Albert ; Włodarczyk, Zbigniew ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimanyi, József
Results of resonance searches in the Xi - pi -, Xi - pi +, Xi -bar+ pi -, and Xi -bar+ pi + invariant mass spectra in proton-proton collisions at sqrt[s]=17.2 GeV are presented. Evidence is shown for the existence of a narrow Xi - pi - baryon resonance with mass of 1.862±0.002 GeV/c2 and width below the detector resolution of about 0.018 GeV/c2. The significance is estimated to be above 4.2 sigma . This state is a candidate for the hypothetical exotic Xi --3/2 baryon with S=-2, I=3 / 2, and a quark content of (dsdsu-bar). At the same mass, a peak is observed in the Xi - pi + spectrum which is a candidate for the Xi 03/2 member of this isospin quartet with a quark content of (dsusd-bar). The corresponding antibaryon spectra also show enhancements at the same invariant mass.
Observation of an exotic S = -2, Q = -2 baryon resonance in proton-proton collisions at the CERN SPS
(2003)
Alt, Christopher ; Antičić, Tome ; Baatar, B. ; Barna, Daniel ; Bartke, Jerzy ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blume, Christoph ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Cerny, Vladimír ; Christakoglou, Panagiotis ; Chvala, Ondrej ; Cramer, John G. ; Csató, Péter ; Darmenov, Nikolay ; Dimitrov, Anton ; Dinkelaker, Peter ; Eckardt, Volker ; Farantatos, Gerassimos ; Filip, Peter ; Flierl, Dominik Bernhard ; Fodor, Zoltán ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Gál, József ; Gaździcki, Marek ; Georgopoulos, George ; Gładysz-Dziaduś, Ewa ; Hegyi, Sándor ; Höhne, Claudia ; Kadija, Krešo ; Karev, Alexandre ; Kniege, Stefan ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Korus, Robert ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lévai, Péter ; Litov, Leandr ; Makariev, Martin Vasilev ; Malakhov, Aleksandr I. ; Markert, Christina ; Mateev, Matej D. ; Mayes, Bill W. ; Melkumov, Georgy L. ; Meurer, Christine ; Mischke, André ; Mitrovski, Michael Kosta ; Molnár, József ; Mrówczyński, Stanislaw ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Panayotov, Dobromir ; Perl, Katarzyna ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Pühlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Retyk, Waldemar ; Roland, Christof ; Roland, Gunther ; Rybczyński, Maciej ; Rybicki, Andrzej ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Seyboth, Peter ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Stefanek, Grzegorz ; Stock, Reinhard ; Ströbele, Herbert ; Šuša, Tatjana ; Szentpétery, Imre ; Sziklai, János ; Trainor, Thomas A. ; Varga, Dezsö ; Vassiliou, Maria ; Veres, Gábor I. ; Vesztergombi, György ; Vranić, Danilo ; Wetzler, Alexander Albert ; Włodarczyk, Zbigniew ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimányi, József
Results of resonance searches in the Xi- pi-, Xi- pi+, antiXi+ pi- and antiXi+ pi+ invariant mass spectra in proton-proton collisions at sqrt s=17.2 GeV are presented. Evidence is shown for the existence of a narrow Xi- pi- baryon resonance with mass of 1.862+/-0.002 GeV/c^2 and width below the detector resolution of about 0.018 GeV/c^2. The significance is estimated to be 4.0 sigma. This state is a candidate for the hypothetical exotic Xi_(3/2)^-- baryon with S = -2, I = 3/2 and a quark content of (d s d s ubar). At the same mass a peak is observed in the Xi- pi+ spectrum which is a candidate for the Xi_(3/2)^0 member of this isospin quartet with a quark content of (d s u s dbar). The corresponding antibaryon spectra also show enhancements at the same invariant mass.
Report from NA49
(2004)
Gaździcki, Marek ; Alt, Christopher ; Antičić, Tome ; Baatar, B. ; Barna, Daniel ; Bartke, Jerzy ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blume, Christoph ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Cerny, Vladimír ; Christakoglou, Panagiotis ; Chvala, Ondrej ; Cramer, John G. ; Csató, Péter ; Darmenov, Nikolay ; Dimitrov, Anton ; Dinkelaker, Peter ; Eckardt, Volker ; Farantatos, Gerassimos ; Filip, Peter ; Flierl, Dominik Bernhard ; Fodor, Zoltán ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Gál, József ; Georgopoulos, George ; Gładysz-Dziaduś, Ewa ; Grebieszkow, Katarzyna ; Hegyi, Sándor ; Höhne, Claudia ; Kadija, Krešo ; Karev, Alexandre ; Kliemant, Michael ; Kniege, Stefan ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Kornas, Ewelina ; Korus, Robert ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lévai, Péter ; Litov, Leandr ; Lungwitz, Benjamin ; Makariev, Martin Vasilev ; Malakhov, Aleksandr I. ; Markert, Christina ; Mateev, Matej D. ; Mayes, Bill W. ; Melkumov, Georgy L. ; Meurer, Christine ; Mischke, André ; Mitrovski, Michael Kosta ; Molnár, József ; Mrówczyński, Stanislaw ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Panayotov, Dobromir ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Pühlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Richard, Agnes Carol Joanna ; Roland, Christof ; Roland, Gunther ; Rybczyński, Maciej ; Rybicki, Andrzej ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Seyboth, Peter ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Stefanek, Grzegorz ; Stock, Reinhard ; Ströbele, Herbert ; Šuša, Tatjana ; Szentpétery, Imre ; Sziklai, János ; Trainor, Thomas A. ; Varga, Dezsö ; Vassiliou, Maria ; Veres, Gábor I. ; Vesztergombi, György ; Vranić, Danilo ; Wetzler, Alexander Albert ; Włodarczyk, Zbigniew ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimányi, József
The most recent data of NA49 on hadron production in nuclear collisions at CERN SPS energies are presented. Anomalies in the energy dependence of pion and kaon production in central Pb+Pb collisions are observed. They suggest that the onset of deconfinement is located at about 30 AGeV. Large multiplicity and transverse momentum fluctuations are measured for collisions of intermediate mass systems at 158 AGeV. The need for a new experimental programme at the CERN SPS is underlined.
Event-by-event fluctuations of particle ratios in central Pb + Pb collisions at 20 to 158 AGeV
(2004)
Roland, Christof ; Alt, Christopher ; Antičić, Tome ; Baatar, B. ; Barna, Daniel ; Bartke, Jerzy ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blume, Christoph ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Cerny, Vladimír ; Christakoglou, Panagiotis ; Chvala, Ondrej ; Cramer, John G. ; Csató, Péter ; Darmenov, Nikolay ; Dimitrov, Anton ; Dinkelaker, Peter ; Eckardt, Volker ; Farantatos, Gerassimos ; Flierl, Dominik Bernhard ; Fodor, Zoltán ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Gál, József ; Gaździcki, Marek ; Georgopoulos, George ; Gładysz-Dziaduś, Ewa ; Grebieszkow, Katarzyna ; Hegyi, Sándor ; Höhne, Claudia ; Kadija, Krešo ; Karev, Alexandre ; Kliemant, Michael ; Kniege, Stefan ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Kornaś, Ewelina ; Korus, Robert ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lévai, Péter ; Litov, Leandr ; Lungwitz, Benjamin ; Makariev, Martin Vasilev ; Malakhov, Aleksandr I. ; Markert, Christina ; Mateev, Matej D. ; Mayes, Bill W. ; Melkumov, Georgy L. ; Meurer, Christine ; Mischke, André ; Mitrovski, Michael Kosta ; Molnár, József ; Mrówczyński, Stanislaw ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Panayotov, Dobromir ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Pühlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Roland, Gunther ; Richard, Agnes Carol Joanna ; Rybczyński, Maciej ; Rybicki, Andrzej ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Seyboth, Peter ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Stefanek, Grzegorz ; Stock, Reinhard ; Ströbele, Herbert ; Šuša, Tatjana ; Szentpétery, Imre ; Sziklai, János ; Trainor, Thomas A. ; Varga, Dezsö ; Vassiliou, Maria ; Veres, Gábor I. ; Vesztergombi, György ; Vranić, Danilo ; Wetzler, Alexander Albert ; Włodarczyk, Zbigniew ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimányi, József
In the vicinity of the QCD phase transition, critical fluctuations have been predicted to lead to non-statistical fluctuations of particle ratios, depending on the nature of the phase transition. Recent results of the NA49 energy scan program show a sharp maximum of the ratio of K+ to Pi+ yields in central Pb+Pb collisions at beam energies of 20-30 AGeV. This observation has been interpreted as an indication of a phase transition at low SPS energies. We present first results on event-by-event fluctuations of the kaon to pion and proton to pion ratios at beam energies close to this maximum.
Mitrovski, Michael K. ; Alt, Christopher ; Antičić, Tome ; Baatar, B. ; Barna, Daniel ; Bartke, Jerzy ; Behler, Matthias ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blume, Christoph ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Cerny, Vladimír ; Christakoglou, Panagiotis ; Chvala, Ondrej ; Cramer, John G. ; Csató, Péter ; Darmenov, Nikolay ; Dimitrov, Anton ; Dinkelaker, Peter ; Eckardt, Volker ; Filip, Peter ; Fischer, Hans Gerhard ; Flierl, Dominik Bernhard ; Fodor, Zoltán ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Gál, József ; Gaździcki, Marek ; Georgopoulos, George ; Gładysz-Dziaduś, Ewa ; Hegyi, Sándor ; Höhne, Claudia ; Kadija, Krešo ; Karev, Alexandre ; Kliemant, Michael ; Kniege, Stefan ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Kornaś, Ewelina ; Korus, Robert ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lévai, Péter ; Litov, Leandr ; Lungwitz, Benjamin ; Makariev, Martin Vasilev ; Malakhov, Aleksandr I. ; Markert, Christina ; Mateev, Matej D. ; Mayes, Bill W. ; Melkumov, Georgy L. ; Meurer, Christine ; Mischke, André ; Mitrovski, Michael Kosta ; Molnár, József ; Mrówczyński, Stanislaw ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Panayotov, Dobromir ; Perl, Katarzyna ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Pühlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Retyk, Waldemar ; Richard, Agnes Carol Joanna ; Roland, Christof ; Roland, Gunther ; Rybczyński, Maciej ; Rybicki, Andrzej ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Seyboth, Peter ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Stefanek, Grzegorz ; Stock, Reinhard ; Ströbele, Herbert ; Šuša, Tatjana ; Szentpétery, Imre ; Sziklai, János ; Trainor, Thomas A. ; Varga, Dezsö ; Vassiliou, Maria ; Veres, Gábor I. ; Vesztergombi, György ; Vranić, Danilo ; Wenig, Siegfried ; Wetzler, Alexander Albert ; Włodarczyk, Zbigniew ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimányi, József
A non-monotonic energy dependence of the K + / pi + ratio with a sharp maximum close to 30 A GeV is observed in central Pb+Pb collisions. Within a statistical model of the early stage, this is interpreted as a sign of the phase transition to a QGP, which causes a sharp change in the energy dependence of the strangeness to entropy ratio. This observation naturally motivates us to study the production of multistrange hyperons (Xi, Omega) as a function of the beam energy. Furthermore it was suggested that the kinematic freeze-out of Omega takes place directly at QGP hadronization. If this is indeed the case, the transverse momentum spectra of the Omega directly reflect the transverse expansion velocity of a hadronizing QGP. In this report we show preliminary NA49 results on Omega - and Omega + production in central Pb+Pb collisions at 40 and 158 A GeV and compare them to measurements of Xi - and Xi + production in central Pb+Pb collisions at 30, 40, 80 and 158 A GeV.
Alt, Christopher ; Antičić, Tome ; Baatar, B. ; Barna, Daniel ; Bartke, Jerzy ; Behler, Matthias ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blume, Christoph ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Cerny, Vladimír ; Christakoglou, Panagiotis ; Chvala, Ondrej ; Cramer, John G. ; Csató, Péter ; Darmenov, Nikolay ; Dimitrov, Anton ; Dinkelaker, Peter ; Eckardt, Volker ; Filip, Peter ; Flierl, Dominik Bernhard ; Fodor, Zoltán ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Gál, József ; Gaździcki, Marek ; Georgopoulos, George ; Gładysz-Dziaduś, Ewa ; Grebieszkow, Katarzyna ; Hegyi, Sándor ; Höhne, Claudia ; Kadija, Krešo ; Karev, Alexandre ; Kliemant, Michael ; Kniege, Stefan ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Kornas, Ewelina ; Korus, Robert ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lévai, Péter ; Litov, Leandr ; Lungwitz, Benjamin ; Makariev, Martin Vasilev ; Malakhov, Aleksandr I. ; Markert, Christina ; Mateev, Matej D. ; Mayes, Bill W. ; Melkumov, Georgy L. ; Meurer, Christine ; Mischke, André ; Mitrovski, Michael Kosta ; Molnár, József ; Mrówczyński, Stanislaw ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Panayotov, Dobromir ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Pühlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Richard, Agnes Carol Joanna ; Roland, Christof ; Roland, Gunther ; Rybczyński, Maciej ; Rybicki, Andrzej ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Seyboth, Peter ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Stefanek, Grzegorz ; Stock, Reinhard ; Ströbele, Herbert ; Šuša, Tatjana ; Szentpétery, Imre ; Sziklai, János ; Trainor, Thomas A. ; Varga, Dezsö ; Vassiliou, Maria ; Veres, Gábor I. ; Vesztergombi, György ; Vranić, Danilo ; Wetzler, Alexander Albert ; Włodarczyk, Zbigniew ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimányi, József
Results are presented on event-by-event electric charge fluctuations in central Pb+Pb collisions at 20, 30, 40, 80 and 158 AGeV. The observed fluctuations are close to those expected for a gas of pions correlated by global charge conservation only. These fluctuations are considerably larger than those calculated for an ideal gas of deconfined quarks and gluons. The present measurements do not necessarily exclude reduced fluctuations from a quark-gluon plasma because these might be masked by contributions from resonance decays.
System-size dependence of strangeness production in nucleus-nucleus collisions at √sNN = 17.3 GeV
(2005)
Alt, Christopher ; Antičić, Tome ; Baatar, B. ; Barna, Daniel ; Bartke, Jerzy ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blume, Christoph ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Cerny, Vladimír ; Christakoglou, Panagiotis ; Chvala, Ondrej ; Cramer, John G. ; Csató, Péter ; Darmenov, Nikolay ; Dimitrov, Anton ; Dinkelaker, Peter ; Eckardt, Volker ; Farantatos, Gerassimos ; Flierl, Dominik Bernhard ; Fodor, Zoltán ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Gál, József ; Gaździcki, Marek ; Georgopoulos, George ; Gładysz-Dziaduś, Ewa ; Grebieszkow, Katarzyna ; Hegyi, Sándor ; Höhne, Claudia ; Kadija, Krešo ; Karev, Alexandre ; Kliemant, Michael ; Kniege, Stefan ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Kornas, Ewelina ; Korus, Robert ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lévai, Péter ; Litov, Leandr ; Lungwitz, Benjamin ; Makariev, Martin Vasilev ; Malakhov, Aleksandr I. ; Markert, Christina ; Mateev, Matej D. ; Mayes, Bill W. ; Melkumov, Georgy L. ; Meurer, Christine ; Mischke, André ; Mitrovski, Michael Kosta ; Molnár, József ; Mrówczyński, Stanislaw ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Panayotov, Dobromir ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Pühlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Richard, Agnes Carol Joanna ; Roland, Christof ; Roland, Gunther ; Rybczyński, Maciej ; Rybicki, Andrzej ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Seyboth, Peter ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Stefanek, Grzegorz ; Stock, Reinhard ; Ströbele, Herbert ; Šuša, Tatjana ; Szentpétery, Imre ; Sziklai, János ; Trainor, Thomas A. ; Trubnikov, Victor ; Varga, Dezsö ; Vassiliou, Maria ; Veres, Gábor I. ; Vesztergombi, György ; Vranić, Danilo ; Wetzler, Alexander Albert ; Włodarczyk, Zbigniew ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimányi, József
Emission of pi, K, phi and Lambda was measured in near-central C+C and Si+Si collisions at 158 AGeV beam energy. Together with earlier data for p+p, S+S and Pb+Pb, the system-size dependence of relative strangeness production in nucleus-nucleus collisions is obtained. Its fast rise and the saturation observed at about 60 participating nucleons can be understood as onset of the formation of coherent partonic subsystems of increasing size. PACS numbers: 25.75.-q
Antičić, Tome ; Baatar, B. ; Barna, Daniel ; Bartke, Jerzy ; Behler, Matthias ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blume, Christoph ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Cerny, Vladimír ; Christakoglou, Panagiotis ; Chvala, Ondrej ; Cramer, John G. ; Csató, Péter ; Darmenov, Nikolay ; Dimitrov, Anton ; Dinkelaker, Peter ; Eckardt, Volker ; Filip, Peter ; Flierl, Dominik Bernhard ; Fodor, Zoltán ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Gál, József ; Gaździcki, Marek ; Georgopoulos, George ; Gładysz-Dziaduś, Ewa ; Hegyi, Sándor ; Höhne, Claudia ; Kadija, Krešo ; Karev, Alexandre ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Kornas, Ewelina ; Korus, Robert ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lévai, Péter ; Litov, Leandr ; Makariev, Martin Vasilev ; Malakhov, Aleksandr I. ; Markert, Christina ; Mateev, Matej D. ; Mayes, Bill W. ; Melkumov, Georgy L. ; Meurer, Christine ; Mischke, André ; Mitrovski, Michael Kosta ; Molnár, József ; Mrówczyński, Stanislaw ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Panayotov, Dobromir ; Perl, Katarzyna ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Pühlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Retyk, Waldemar ; Roland, Christof ; Roland, Gunther ; Rybczyński, Maciej ; Rybicki, Andrzej ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Seyboth, Peter ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Stefanek, Grzegorz ; Stock, Reinhard ; Ströbele, Herbert ; Šuša, Tatjana ; Szentpétery, Imre ; Sziklai, János ; Trainor, Thomas A. ; Varga, Dezsö ; Vassiliou, Maria ; Veres, Gábor I. ; Vesztergombi, György ; Vranić, Danilo ; Wetzler, Alexander Albert ; Włodarczyk, Zbigniew ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimányi, József
Production of Lambda and Antilambda hyperons was measured in central Pb-Pb collisions at 40, 80, and 158 A GeV beam energy on a fixed target. Transverse mass spectra and rapidity distributions are given for all three energies. The Lambda/pi ratio at mid-rapidity and in full phase space shows a pronounced maximum between the highest AGS and 40 A GeV SPS energies, whereas the anti-Lambda}/pi ratio exhibits a monotonic increase. PACS numbers: 25.75.-q
Alt, Christopher ; Antičić, Tome ; Baatar, B. ; Barna, Daniel ; Bartke, Jerzy ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blume, Christoph ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Cerny, Vladimír ; Christakoglou, Panagiotis ; Chvala, Ondrej ; Cramer, John G. ; Csató, Péter ; Darmenov, Nikolay ; Dimitrov, Anton ; Dinkelaker, Peter ; Eckardt, Volker ; Farantatos, Gerassimos ; Flierl, Dominik Bernhard ; Fodor, Zoltán ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Gál, József ; Gaździcki, Marek ; Georgopoulos, George ; Gładysz-Dziaduś, Ewa ; Grebieszkow, Katarzyna ; Hegyi, Sándor ; Höhne, Claudia ; Kadija, Krešo ; Karev, Alexandre ; Kliemant, Michael ; Kniege, Stefan ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Kornas, Ewelina ; Korus, Robert ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lévai, Péter ; Litov, Leandr ; Lungwitz, Benjamin ; Makariev, Martin Vasilev ; Malakhov, Aleksandr I. ; Markert, Christina ; Mateev, Matej D. ; Mayes, Bill W. ; Melkumov, Georgy L. ; Meurer, Christine ; Mischke, André ; Mitrovski, Michael Kosta ; Molnár, József ; Mrówczyński, Stanislaw ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Panayotov, Dobromir ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Pühlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Richard, Agnes Carol Joanna ; Roland, Christof ; Roland, Gunther ; Rybczyński, Maciej ; Rybicki, Andrzej ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Seyboth, Peter ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Stefanek, Grzegorz ; Stock, Reinhard ; Ströbele, Herbert ; Šuša, Tatjana ; Szentpétery, Imre ; Sziklai, János ; Trainor, Thomas A. ; Varga, Dezsö ; Vassiliou, Maria ; Veres, Gábor I. ; Vesztergombi, György ; Vranić, Danilo ; Wetzler, Alexander Albert ; Włodarczyk, Zbigniew ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimányi, József
Results are presented on Omega production in central Pb+Pb collisions at 40 and 158 AGeV beam energy. Given are transverse-mass spectra, rapidity distributions, and total yields for the sum Omega+Antiomega at 40 AGeV and for Omega and Antiomega separately at 158 AGeV. The yields are strongly under-predicted by the string-hadronic UrQMD model and are in better agreement with predictions from a hadron gas models. PACS numbers: 25.75.Dw
Seyboth, Peter ; Alt, Christopher ; Antičić, Tome ; Baatar, B. ; Barna, Daniel ; Bartke, Jerzy ; Betev, Latchezar ; Białkowska, Helena ; Blume, Christoph ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Černý, Vladimír ; Christakoglou, Panagiotis ; Chvala, Ondrej ; Cramer, John G. ; Csató, Péter ; Darmenov, Nikolay ; Dimitrov, Anton ; Dinkelaker, Peter ; Eckardt, Volker ; Farantatos, Gerassimos ; Flierl, Dominik Bernhard ; Fodor, Zoltán ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Gál, József ; Gaździcki, Marek ; Georgopoulos, George ; Gładysz-Dziaduś, Ewa ; Grebieszkow, Katarzyna ; Hegyi, Sándor ; Hoehne, Claudia ; Kadija, Krešo ; Karev, Alexandre ; Kliemant, Michael ; Kniege, Stefan ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Kornaś, Ewelina ; Korus, Robert ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lévai, Péter ; Litov, Leandr ; Lungwitz, Benjamin ; Makariev, Martin Vasilev ; Malakhov, Aleksandr I. ; Markert, Christina ; Mateev, Matej D. ; Mayes, Bill W. ; Melkumov, Georgy L. ; Meurer, Christine ; Mischke, André ; Mitrovski, Michael Kosta ; Molnar, József ; Mrowczynski, Stanislaw ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Panayotov, Dobromir ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Pühlhofer, Falk ; Renfordt, Rainer Arno Ernst ; Richard, Agnes Carol Joanna ; Roland, Christof ; Roland, Gunther ; Rybczyński, Maciej ; Rybicki, Andrzej ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Seyboth, Peter ; Sikler, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Stefanek, Grzegorz ; Stock, Reinhard ; Ströbele, Herbert ; Šuša, Tatjana ; Szentpetery, Imre ; Sziklai, János ; Trainor, Thomas A. ; Varga, Dezsö ; Vassiliou, Maria ; Veres, Gábor I. ; Vesztergombi, György ; Vranić, Danilo ; Wetzler, Alexander Albert ; Włodarczyk, Zbigniew ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimanyi, József
Particle production in central Pb+Pb collisions was studied with the NA49 large acceptance spectrometer at the CERN SPS at beam energies of 20, 30, 40, 80, and 158 GeV per nucleon. A change of the energy dependence is observed around 30A GeV for the yields of pions and strange particles as well as for the shapes of the transverse mass spectra. At present only a reaction scenario with onset of deconfinement is able to reproduce the measurements.
Flierl, Dominik Bernhard ; Alt, Christopher ; Antičić, Tome ; Baatar, B. ; Barna, Daniel ; Bartke, Jerzy ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blume, Christoph ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Černý, Vladimír ; Christakoglou, Panagiotis ; Chvala, Ondrej ; Cramer, John G. ; Csató, Péter ; Darmenov, Nikolay ; Dimitrov, Anton ; Dinkelaker, Peter ; Eckardt, Volker ; Fodor, Zoltán ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Gál, József ; Gaździcki, Marek ; Georgopoulos, George ; Gładysz-Dziaduś, Ewa ; Grebieszkow, Katarzyna ; Hegyi, Sándor ; Höhne, Claudia ; Kadija, Krešo ; Karev, Alexandre ; Kliemant, Michael ; Kniege, Stefan ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Kornas, Ewelina ; Korus, Robert ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lévai, Péter ; Litov, Leandr ; Lungwitz, Benjamin ; Makariev, Martin Vasilev ; Malakhov, Aleksandr I. ; Markert, Christina ; Mateev, Matej D. ; Mayes, Bill W. ; Melkumov, Georgy L. ; Meurer, Christine ; Mischke, André ; Mitrovski, Michael Kosta ; Molnár, József ; Mrówczynski, Stanislaw ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Panayotov, Dobromir ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Pühlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Richard, Agnes Carol Joanna ; Roland, Christof ; Roland, Gunther ; Rybczyński, Maciej ; Rybicki, Andrzej ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Seyboth, Peter ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Stefanek, Grzegorz ; Stock, Reinhard ; Ströbele, Herbert ; Šuša, Tatjana ; Szentpétery, Imre ; Sziklai, János ; Trainor, Thomas A. ; Trubnikov, Victor ; Varga, Dezsö ; Vassiliou, Maria ; Veres, Gábor I. ; Vesztergombi, György ; Vranić, Danilo ; Wetzler, Alexander Albert ; Włodarczyk, Zbigniew ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimanyi, József
The hadronic final state of central Pb+Pb collisions at 20, 30, 40, 80, and 158 AGeV has been measured by the CERN NA49 collaboration. The mean transverse mass of pions and kaons at midrapidity stays nearly constant in this energy range, whereas at lower energies, at the AGS, a steep increase with beam energy was measured. Compared to p+p collisions as well as to model calculations, anomalies in the energy dependence of pion and kaon production at lower SPS energies are observed. These findings can be explained, assuming that the energy density reached in central A+A collisions at lower SPS energies is sufficient to transform the hot and dense nuclear matter into a deconfined phase.
Flierl, Dominik Bernhard ; Alt, Christopher ; Antičić, Tome ; Baatar, B. ; Barna, Daniel ; Bartke, Jerzy ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blume, Christoph ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Černý, Vladimír ; Christakoglou, Panagiotis ; Chvala, Ondrej ; Cramer, John G. ; Csato, Péter ; Darmenov, Nikolay ; Dimitrov, Anton ; Dinkelaker, Peter ; Eckardt, Volker ; Farantatos, Gerassimos ; Fodor, Zoltán ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Gal, József ; Gaździcki, Marek ; Georgopoulos, George ; Gładysz-Dziaduś, Ewa ; Grebieszkow, Katarzyna ; Hegyi, Sándor ; Hohne, Claudia ; Kadija, Krešo ; Karev, Alexandre ; Kliemant, Michael ; Kniege, Stefan ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Kornas, Ewelina ; Korus, Robert ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lévai, Péter ; Litov, Leandr ; Lungwitz, Benjamin ; Makariev, Martin Vasilev ; Malakhov, Aleksandr I. ; Markert, Christina ; Mateev, Matej D. ; Mayes, Bill W. ; Melkumov, Georgy L. ; Meurer, Christine ; Mischke, André ; Mitrovski, Michael Kosta ; Molnar, József ; Mrowczynski, Stanislaw ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Panayotov, Dobromir ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence S. ; Puhlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Richard, Agnes Carol Joanna ; Roland, Christof ; Roland, Gunther ; Rybczyński, Maciej ; Rybicki, Andrzej ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Seyboth, Peter ; Sikler, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Stefanek, Grzegorz ; Stock, Reinhard ; Ströbele, Herbert ; Šuša, Tatjana ; Szentpetery, Imre ; Sziklai, János ; Trainor, Thomas A. ; Trubnikov, Victor ; Varga, Dezsö ; Vassiliou, Maria ; Veres, Gábor I. ; Vesztergombi, György ; Vranić, Danilo ; Wetzler, Alexander Albert ; Włodarczyk, Zbigniew ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimanyi, József
The hadronic final state of central Pb+Pb collisions at 20, 30, 40, 80, and 158 AGeV has been measured by the CERN NA49 collaboration. The mean transverse mass of pions and kaons at midrapidity stays nearly constant in this energy range, whereas at lower energies, at the AGS, a steep increase with beam energy was measured. Compared to p+p collisions as well as to model calculations, anomalies in the energy dependence of pion and kaon production at lower SPS energies are observed. These findings can be explained, assuming that the energy density reached in central A+A collisions at lower SPS energies is sufficient to force the hot and dense nuclear matter into a deconfined phase.
Abgrall, Nicolas ; Aduszkiewicz, Antoni ; Andronov, Evgeny V. ; Antičić, Tome ; Baatar, B. ; Baszczyk, Mateusz ; Bhosale, S. ; Blondel, A. ; Bogomilov, Mariyan ; Brandin, Andrei V. ; Bravar, Alessandro ; Bryliński, Wojciech ; Brzychczyk, Janusz ; Bunyatov, S. A. ; Busygina, O. ; Bzdak, A. ; Cherif, H. ; Ćirković, M. ; Czopowicz, T. ; Damyanova, A. ; Davis, N. ; Deveaux, Michael ; Dominik, W. ; Dorosz, Piotr ; Dumarchez, J. ; Engel, Ralph ; Ereditato, A. ; Feofilov, Grigori A. ; Fields, L. ; Fodor, Zoltán ; Garibov, A. ; Gaździcki, Marek ; Golosov, Oleg ; Golubeva, Marina ; Grebieszkow, Katarzyna ; Guber, Fedor ; Haesler, A. ; Hasegawa, T. ; Hervé, A. E. ; Igolkin, Sergey N. ; Ilieva, Stoyanka ; Ivashkin, Alexander ; Johnson, S. R. ; Kadija, Krešo ; Kaptur, E. ; Kargin, N. ; Kashirin, E. ; Kiełbowicz, Mirosław ; Kireyeu, Viktar A. ; Klochkov, Viktor ; Kobayashi, Taiyo ; Kolesnikov, Vadim I. ; Kolev, D. ; Korzenev, A. ; Kovalenko, V. N. ; Kowalik, K. ; Kowalski, S. ; Koziel, Michal ; Krasnoperov, A. ; Kucewicz, Wojciech ; Kuich, M. ; Kurepin, Alexander ; Larsen, Dag Toppe ; László, A. ; Lazareva, Tatiana V. ; Lewicki, M. ; Łojek, K. ; Łysakowski, B. ; Lyubushkin, V. V. ; Maćkowiak-Pawłowska, Maja ; Majka, Zbigniew ; Maksiak, B. ; Malakhov, Aleksandr I. ; Manić, D. ; Marchionni, A. ; Marcinek, A. ; Marino, A. D. ; Marton, K. ; Mathes, H. J. ; Matulewicz, Tomasz ; Matveev, V. ; Melkumov, Georgy L. ; Merzlaya, Anastasia O. ; Messerly, B. ; Mik, Łukasz ; Mills, G. B. ; Morozov, Sergey ; Mrówczyński, Stanislaw ; Nagai, Y. ; Nakadaira, T. ; Naskręt, Michał ; Nishikawa, K. ; Ozvenchuk, Vitalii ; Paolone, V. ; Pavin, M. ; Petukhov, Oleg ; Pistillo, C. ; Płaneta, Roman ; Podlaski, P. ; Popov, B. A. ; Posiadała-Zezula, M. ; Prokhorova, D. S. ; Puławski, S. ; Puzović, Jovan ; Rauch, Wolfgang Hans ; Ravonel, M. ; Renfordt, Rainer Arno Ernst ; Richter-Wąs, E. ; Röhrich, Dieter ; Rondio, E. ; Roth, M. ; Rumberger, Brant T. ; Rustamov, Anar ; Rybczyński, Maciej ; Rybicki, Andrzej ; Sadovsky, Alexander ; Sakashita, K. ; Schmidt, K. ; Sekiguchi, T. ; Selyuzhenkov, Ilya ; Seryakov, A. Yu. ; Seyboth, Peter ; Shibata, M. ; Słodkowski, M. ; Snoch, Aleksandra ; Staszel, P. ; Stefanek, Grzegorz ; Stepaniak, J. ; Strichanov, Michail Nikolaevič ; Ströbele, Herbert ; Šuša, Tatjana ; Tada, M. ; Taranenko, Arkadiy ; Tefelska, A. ; Tefelski, Dariusz ; Tereshchenko, V. ; Toia, Alberica ; Tsenov, R. ; Turko, L. ; Ulrich, R. ; Unger, M. ; Valiev, F. F. ; Veberič, Darko ; Vechernin, V. V. ; Walewski, M. ; Wickremasinghe, A. ; Włodarczyk, Zbigniew ; Wojtaszek-Szwarc, Agnieszka ; Wyszyński, Oskar ; Zambelli, L. ; Zimmerman, E. D. ; Zwaska, Robert ; Berns, L. ; Fiorentini, G. A. ; Friend, M. ; Hartz, M. ; Vladisavljevic, T. ; Yu, M.
Measurements of the π±, K±, and proton double differential yields emitted from the surface of the 90-cm-long carbon target (T2K replica) were performed for the incoming 31 GeV/c protons with the NA61/SHINE spectrometer at the CERN SPS using data collected during 2010 run. The double differential π± yields were measured with increased precision compared to the previously published NA61/SHINE results, while the K± and proton yields were obtained for the first time. A strategy for dealing with the dependence of the results on the incoming proton beam profile is proposed. The purpose of these measurements is to reduce significantly the (anti)neutrino flux uncertainty in the T2K long-baseline neutrino experiment by constraining the production of (anti)neutrino ancestors coming from the T2K target.
Aduszkiewicz, Antoni ; Ali, Yasir ; Andronov, Evgeny V. ; Antičić, Tome ; Baatar, B. ; Baszczyk, Mateusz ; Bhosale, S. ; Blondel, A. ; Bogomilov, Mariyan ; Brandin, Andrei V. ; Bravar, Alessandro ; Brzychczyk, Janusz ; Bunyatov, S. A. ; Busygina, O. ; Cherif, H. ; Ćirković, M. ; Czopowicz, T. ; Damyanova, A. ; Davis, N. ; Dembinski, H. ; Deveaux, Michael ; Dominik, W. ; Dorosz, Piotr ; Dumarchez, J. ; Engel, Ralph ; Ereditato, A. ; Faas, S. ; Feofilov, Grigori A. ; Fodor, Zoltán ; Francois, C. ; Garrido, X. ; Garibov, A. ; Gaździcki, Marek ; Golubeva, Marina ; Grebieszkow, Katarzyna ; Guber, Fedor ; Haesler, A. ; Hervé, A. E. ; Hylen, J. ; Igolkin, Sergey N. ; Ivashkin, Alexander ; Johnson, S. R. ; Kadija, Krešo ; Kaptur, E. ; Kiełbowicz, Mirosław ; Kireyeu, Viktar A. ; Klochkov, Viktor ; Kolesnikov, Vadim I. ; Kolev, D. ; Korzenev, A. ; Kovalenko, V. N. ; Kowalik, K. ; Kowalski, S. ; Koziel, Michal ; Krasnoperov, A. ; Kucewicz, Wojciech ; Kuich, M. ; Kurepin, Alexander ; Larsen, Dag Toppe ; László, A. ; Lazareva, Tatiana V. ; Lewicki, M. ; Lundberg, B. ; Łysakowski, B. ; Lyubushkin, V. V. ; Mariş, I. C. ; Maćkowiak-Pawłowska, Maja ; Maksiak, B. ; Malakhov, Aleksandr I. ; Manić, D. ; Marchionni, A. ; Marcinek, A. ; Marino, A. D. ; Marton, K. ; Mathes, H. -J. ; Matulewicz, Tomasz ; Matveev, V. ; Melkumov, Georgy L. ; Merzlaya, Anastasia O. ; Messerly, B. ; Mik, Łukasz ; Mills, G. B. ; Morozov, Sergey ; Mrówczyński, Stanislaw ; Nagai, Y. ; Naskręt, Michał ; Ozvenchuk, Vitalii ; Paolone, V. ; Pavin, M. ; Petukhov, Oleg ; Pistillo, C. ; Płaneta, Roman ; Podlaski, P. ; Popov, B. A. ; Posiadała, M. ; Puławski, S. ; Puzović, Jovan ; Rameika, R. ; Rauch, Wolfgang Hans ; Ravonel, M. ; Renfordt, Rainer Arno Ernst ; Richter-Wąs, E. ; Röhrich, Dieter ; Rondio, E. ; Roth, M. ; Rumberger, Brant T. ; Ruprecht, M. ; Rustamov, Anar ; Rybczyński, Maciej ; Rybicki, Andrzej ; Sadovsky, Alexander ; Schmidt, K. ; Selyuzhenkov, Ilya ; Seryakov, A. Yu. ; Seyboth, Peter ; Słodkowski, M. ; Snoch, Aleksandra ; Staszel, P. ; Stefanek, Grzegorz ; Stepaniak, J. ; Strichanov, Michail Nikolaevič ; Ströbele, Herbert ; Šuša, Tatjana ; Szuba, M. ; Taranenko, Arkadiy ; Tefelska, A. ; Tefelski, Dariusz ; Tereshchenko, V. ; Toia, Alberica ; Tsenov, R. ; Turko, L. ; Ulrich, R. ; Unger, M. ; Valiev, F. F. ; Veberič, Darko ; Vechernin, V. V. ; Walewski, M. ; Wickremasinghe, A. ; Wilkinson, C. ; Włodarczyk, Zbigniew ; Wojtaszek-Szwarc, Agnieszka ; Wyszyński, Oskar ; Zambelli, L. ; Zimmerman, E. D. ; Zwaska, Robert
We present measurements of ρ0, ω and K∗0 spectra in π−+ C production interactions at 158 GeV / c and ρ0 spectra at 350 GeV / c using the NA61/SHINE spectrometer at the CERN SPS. Spectra are presented as a function of the Feynman’s variable xF in the range 0<xF<1 and 0<xF<0.5 for 158 and 350 GeV / c respectively. Furthermore, we show comparisons with previous measurements and predictions of several hadronic interaction models. These measurements are essential for a better understanding of hadronic shower development and for improving the modeling of cosmic ray air showers.
Aduszkiewicz, Antoni ; Andronov, Evgeny V. ; Antičić, Tome ; Babkin, Vadim A. ; Baszczyk, Mateusz ; Bhosale, S. ; Blondel, A. ; Bogomilov, Mariyan ; Brandin, Andrei V. ; Bravar, Alessandro ; Bryliński, Wojciech ; Brzychczyk, Janusz ; Buryakov, M. ; Busygina, O. ; Bzdak, A. ; Cherif, H. ; Ćirković, M. ; Csanád, Máté ; Cybowska, J. ; Czopowicz, T. ; Damyanova, A. ; Davis, N. ; Deliyergiyev, M. ; Deveaux, Michael ; Dmitriev, A. ; Dominik, W. ; Dorosz, Piotr ; Dumarchez, J. ; Engel, Ralph ; Feofilov, Grigori A. ; Fields, L. ; Fodor, Zoltán ; Garibov, A. ; Gaździcki, Marek ; Golosov, Oleg ; Golovatyuk, V. ; Golubeva, Marina ; Grebieszkow, Katarzyna ; Guber, Fedor ; Haesler, A. ; Igolkin, Sergey N. ; Ilieva, Stoyanka ; Ivashkin, Alexander ; Johnson, S. R. ; Kadija, Krešo ; Kargin, N. ; Kashirin, E. ; Kiełbowicz, Mirosław ; Kireyeu, Viktar A. ; Klochkov, Viktor ; Kolesnikov, Vadim I. ; Kolev, D. ; Korzenev, A. ; Kovalenko, V. N. ; Kowalski, S. ; Koziel, Michal ; Krasnoperov, A. ; Kucewicz, Wojciech ; Kuich, M. ; Kurepin, Alexander ; Larsen, Dag Toppe ; László, A. ; Lazareva, Tatiana V. ; Lewicki, M. ; Łojek, K. ; Lyubushkin, V. V. ; Maćkowiak-Pawłowska, Maja ; Majka, Zbigniew ; Maksiak, B. ; Malakhov, Aleksandr I. ; Marcinek, A. ; Marino, A. D. ; Marton, K. ; Mathes, H.-J. ; Matulewicz, Tomasz ; Matveev, V. ; Melkumov, Georgy L. ; Merzlaya, Anastasia O. ; Messerly, B. ; Mik, Łukasz ; Morozov, Sergey ; Mrówczyński, Stanislaw ; Nagai, Y. ; Naskręt, Michał ; Ozvenchuk, Vitalii ; Paolone, V. ; Petukhov, Oleg ; Płaneta, Roman ; Podlaski, P. ; Popov, B. A. ; Porfy, B. ; Posiadała-Zezula, M. ; Prokhorova, D. S. ; Pszczel, Damian ; Puławski, S. ; Puzović, Jovan ; Ravonel, M. ; Renfordt, Rainer Arno Ernst ; Röhrich, Dieter ; Rondio, E. ; Roth, M. ; Rumberger, Brant T. ; Rumyantsev, M. ; Rustamov, Anar ; Rybczyński, Maciej ; Rybicki, Andrzej ; Sadovsky, Alexander ; Schmidt, K. ; Selyuzhenkov, Ilya ; Seryakov, A. Yu. ; Seyboth, Peter ; Słodkowski, M. ; Staszel, P. ; Stefanek, Grzegorz ; Stepaniak, J. ; Strichanov, Michail Nikolaevič ; Ströbele, Herbert ; Šuša, Tatjana ; Taranenko, Arkadiy ; Tefelska, A. ; Tefelski, Dariusz ; Tereshchenko, V. ; Toia, Alberica ; Tsenov, R. ; Turko, L. ; Ulrich, R. ; Unger, M. ; Uzhva, Denis ; Valiev, F. F. ; Veberič, Darko ; Vechernin, V. V. ; Wickremasinghe, A. ; Włodarczyk, Zbigniew ; Wojcik, K. ; Wyszyński, Oskar ; Zimmerman, E. D. ; Zwaska, Robert
his Erratum replaces incorrect plots shown in Fig. 7 with the corrected ones. In the publication, the NA57 [1] ratios of Ξ− and Ξ¯¯¯¯+ to the number of wounded nucleons at ⟨NW⟩=349 by mistake were plotted at the wrong values. The ratios were calculated and plotted by mistake using ⟨NW⟩=249.
The correct normalization does not change the conclusions of the paper. The correctly normalized results are presented in Fig. 7.
Aduszkiewicz, Antoni ; Andronov, Evgeny V. ; Antičić, Tome ; Babkin, Vadim A. ; Baszczyk, Mateusz ; Bhosale, S. ; Blondel, A. ; Bogomilov, Mariyan ; Brandin, Andrei V. ; Bravar, Alessandro ; Bryliński, Wojciech ; Brzychczyk, Janusz ; Buryakov, M. ; Busygina, O. ; Bzdak, A. ; Cherif, H. ; Ćirković, M. ; Csanád, Máté ; Cybowska, J. ; Czopowicz, T. ; Damyanova, A. ; Davis, N. ; Deliyergiyev, M. ; Deveaux, Michael ; Dmitriev, A. ; Dominik, W. ; Dorosz, Piotr ; Dumarchez, J. ; Engel, Ralph ; Feofilov, Grigori A. ; Fields, L. ; Fodor, Zoltán ; Garibov, A. ; Gaździcki, Marek ; Golosov, Oleg ; Golovatyuk, V. ; Golubeva, Marina ; Grebieszkow, Katarzyna ; Guber, Fedor ; Haesler, A. ; Igolkin, Sergey N. ; Ilieva, Stoyanka ; Ivashkin, Alexander ; Johnson, S. R. ; Kadija, Krešo ; Kargin, N. ; Kashirin, E. ; Kiełbowicz, Mirosław ; Kireyeu, Viktar A. ; Klochkov, Viktor ; Kolesnikov, Vadim I. ; Kolev, D. ; Korzenev, A. ; Kovalenko, V. N. ; Kowalski, S. ; Koziel, Michal ; Krasnoperov, A. ; Kucewicz, Wojciech ; Kuich, M. ; Kurepin, Alexander ; Larsen, Dag Toppe ; László, A. ; Lazareva, Tatiana V. ; Lewicki, M. ; Łojek, K. ; Lyubushkin, V. V. ; Maćkowiak-Pawłowska, Maja ; Majka, Zbigniew ; Maksiak, Bartosz ; Malakhov, Aleksandr I. ; Marcinek, A. ; Marino, A. D. ; Marton, K. ; Mathes, H.-J. ; Matulewicz, Tomasz ; Matveev, V. ; Melkumov, Georgy L. ; Merzlaya, Anastasia O. ; Messerly, B. ; Mik, Łukasz ; Morozov, Sergey ; Mrówczyński, Stanislaw ; Nagai, Y. ; Naskręt, Michał ; Ozvenchuk, Vitalii ; Paolone, V. ; Petukhov, Oleg ; Płaneta, Roman ; Podlaski, P. ; Popov, B. A. ; Porfy, B. ; Posiadała-Zezula, M. ; Prokhorova, D. S. ; Pszczel, Damian ; Puławski, Szymon ; Puzović, Jovan ; Ravonel, M. ; Renfordt, Rainer Arno Ernst ; Röhrich, Dieter ; Rondio, E. ; Roth, M. ; Rumberger, Brant T. ; Rumyantsev, M. ; Rustamov, Anar ; Rybczyński, Maciej ; Rybicki, Andrzej ; Sadovsky, Alexander ; Schmidt, K. ; Selyuzhenkov, Ilya ; Seryakov, A. Yu. ; Seyboth, Peter ; Słodkowski, M. ; Staszel, P. ; Stefanek, Grzegorz ; Stepaniak, J. ; Strichanov, Michail Nikolaevič ; Ströbele, Herbert ; Šuša, Tatjana ; Taranenko, Arkadiy ; Tefelska, A. ; Tefelski, Dariusz ; Tereshchenko, V. ; Toia, Alberica ; Tsenov, R. ; Turko, L. ; Ulrich, R. ; Unger, M. ; Uzhva, Denis ; Valiev, F. F. ; Veberič, Darko ; Vechernin, V. V. ; Wickremasinghe, A. ; Włodarczyk, Zbigniew ; Wojcik, K. ; Wyszyński, Oskar ; Zimmerman, E. D. ; Zwaska, Robert
The production of Ξ(1321)− and Ξ¯¯¯¯(1321)+ hyperons in inelastic p+p interactions is studied in a fixed target experiment at a beam momentum of 158 GeV/c. Double differential distributions in rapidity y and transverse momentum pT are obtained from a sample of 33M inelastic events. They allow to extrapolate the spectra to full phase space and to determine the mean multiplicity of both Ξ− and Ξ¯¯¯¯+. The rapidity and transverse momentum spectra are compared to transport model predictions. The Ξ− mean multiplicity in inelastic p+p interactions at 158 GeV/c is used to quantify the strangeness enhancement in A+A collisions at the same centre-of-mass energy per nucleon pair.
Acharya, A. ; Adhikary, H. ; Allison, K. K. ; Andronov, Evgeny V. ; Antičić, Tome ; Babkin, Vadim A. ; Baszczyk, Mateusz ; Bhosale, S. ; Blondel, A. ; Bogomilov, Mariyan ; Brandin, Andrei V. ; Bravar, Alessandro ; Bryliński, Wojciech ; Brzychczyk, Janusz ; Buryakov, M. ; Busygina, O. ; Bzdak, A. ; Cherif, H. ; Ćirković, M. ; Csanád, Máté ; Cybowska, J. ; Czopowicz, T. ; Damyanova, A. ; Davis, N. ; Deliyergiyev, M. ; Deveaux, Michael ; Dmitriev, A. ; Dominik, W. ; Dorosz, Piotr ; Dumarchez, J. ; Engel, Ralph ; Feofilov, Grigori A. ; Fields, L. ; Fodor, Zoltán ; Garibov, A. ; Gaździcki, Marek ; Golosov, Oleg ; Golovatyuk, V. ; Golubeva, Marina ; Grebieszkow, Katarzyna ; Guber, Fedor ; Haesler, A. ; Igolkin, Sergey N. ; Ilieva, Stoyanka ; Ivashkin, Alexander ; Johnson, S. R. ; Kadija, Krešo ; Kargin, N. ; Kashirin, E. ; Kiełbowicz, Mirosław ; Kireyeu, Viktar A. ; Klochkov, Viktor ; Kolesnikov, Vadim I. ; Kolev, D. ; Korzenev, A. ; Kovalenko, V. N. ; Kowalski, S. ; Koziel, Michal ; Kozłowski, B. ; Krasnoperov, A. ; Kucewicz, Wojciech ; Kuich, M. ; Kurepin, Alexander ; Larsen, Dag Toppe ; László, A. ; Lazareva, Tatiana V. ; Lewicki, M. ; Łojek, K. ; Lyubushkin, V. V. ; Maćkowiak-Pawłowska, Maja ; Majka, Zbigniew ; Maksiak, B. ; Malakhov, Aleksandr I. ; Marcinek, A. ; Marino, A. D. ; Marton, K. ; Mathes, H. -J. ; Matulewicz, Tomasz ; Matveev, V. ; Melkumov, Georgy L. ; Merzlaya, Anastasia O. ; Messerly, B. ; Mik, Łukasz ; Morozov, Sergey ; Nagai, Y. ; Naskręt, Michał ; Ozvenchuk, Vitalii ; Paolone, V. ; Petukhov, Oleg ; Pidhurskyi, I. ; Płaneta, Roman ; Podlaski, P. ; Popov, B. A. ; Porfy, B. ; Posiadała-Zezula, M. ; Prokhorova, D. S. ; Pszczel, Damian ; Puławski, S. ; Puzović, Jovan ; Ravonel, M. ; Renfordt, Rainer Arno Ernst ; Röhrich, Dieter ; Rondio, E. ; Roth, M. ; Rumberger, Brant T. ; Rumyantsev, M. ; Rustamov, Anar ; Rybczyński, Maciej ; Rybicki, Andrzej ; Sadhu, Samrangy ; Sadovsky, Alexander ; Schmidt, K. ; Selyuzhenkov, Ilya ; Seryakov, A. Yu. ; Seyboth, Peter ; Słodkowski, M. ; Staszel, P. ; Stefanek, Grzegorz ; Stepaniak, J. ; Strichanov, Michail Nikolaevič ; Ströbele, Herbert ; Šuša, Tatjana ; Taranenko, Arkadiy ; Tefelska, A. ; Tefelski, Dariusz ; Tereshchenko, V. ; Toia, Alberica ; Tsenov, R. ; Turko, L. ; Ulrich, R. ; Unger, M. ; Uzhva, Denis ; Valiev, F. F. ; Veberič, Darko ; Vechernin, V. V. ; Wickremasinghe, A. ; Wójcik, K. ; Wyszyński, Oskar ; Zaitsev, A. ; Zimmerman, E. D. ; Zwaska, Robert
The physics goal of the strong interaction program of the NA61/SHINE experiment at the CERN Super Proton Synchrotron (SPS) is to study the phase diagram of hadronic matter by a scan of particle production in collisions of nuclei with various sizes at a set of energies covering the SPS energy range. This paper presents differential inclusive spectra of transverse momentum, transverse mass and rapidity of π− mesons produced in central 40Ar+45Sc collisions at beam momenta of 13A, 19A, 30A, 40A, 75A and 150A Ge V /c. Energy and system size dependence of parameters of these distributions – mean transverse mass, the inverse slope parameter of transverse mass spectra, width of the rapidity distribution and mean multiplicity – are presented and discussed. Furthermore, the dependence of the ratio of the mean number of produced pions to the mean number of wounded nucleons on the collision energy was derived. The results are compared to predictions of several models.