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Afanasiev, Sergey V. ; Antičić, Tome ; Bächler, Joachim ; Barna, Daniel ; Barnby, Lee Stuart ; Bartke, Jerzy ; Barton, Robert Allan ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blume, Christoph ; Blyth, Charles O. ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Brady, Franklin Paul ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Carr, Lincoln D. ; Cebra, Daniel A. ; Cooper, Glenn E. ; Cramer, John G. ; Csató, Péter ; Eckardt, Volker ; Eckhardt, Frank ; Ferenc, Daniel ; Filip, Peter ; Fischer, Hans Gerhard ; Fodor, Zoltán ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Ftacnik, Jan ; Gál, József ; Gaździcki, Marek ; Georgopoulos, George ; Gładysz-Dziaduś, Ewa ; Harris, John W. ; Hegyi, Sándor ; Hlinka, V. ; Höhne, Claudia ; Igo, George J. ; Ivanov, Marian ; Jacobs, Peter Martin ; Janik, Rudolf ; Jones, Peter Graham ; Kadija, Krešo ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Kowalski, Marek ; Lasiuk, Brian ; Leeuwen, Marco van ; Lévai, Péter ; Malakhov, Aleksandr I. ; Margetis, Spyridon ; Markert, Christina ; Mayes, Bill W. ; Melkumov, Georgy L. ; Mischke, André ; Molnár, József ; Nelson, John M. ; Odyniec, Grazyna Janina ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Poskanzer, Arthur M. ; Prindle, Duncan J. ; Pühlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Retyk, Waldemar ; Ritter, Hans Georg ; Röhrich, Dieter ; Roland, Christof ; Roland, Gunther ; Rybicki, Andrzej ; Sammer, Thomas ; Sandoval, Andres ; Sann, Hans ; Schäfer, Erich ; Schmitz, Norbert ; Seyboth, Peter ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Snellings, Raimond ; Squier, Gordon Thomas Anderson ; Stock, Reinhard ; Strmen, Peter ; Ströbele, Herbert ; Šuša, Tatjana ; Szarka, Imrich ; Szentpétery, Imre ; Sziklai, János ; Toy, Milton Y. ; Trainor, Thomas A. ; Trentalange, Stephen ; Ullrich, Thomas ; Varga, Dezsö ; Vassiliou, Maria ; Veres, Gábor I. ; Vesztergombi, György ; Voloshin, Sergei ; Vranić, Danilo ; Wang, Feipeng ; Weerasundara, Dhammika D. ; Wenig, Siegfried ; Wetzler, Alexander Albert ; Whitten, Charles A. ; Xu, Nu ; Yates, Tim A. ; Yoo, In-Kwon ; Zimányi, József
We present the first measurement of fluctuations from event to event in the production of strange particles in collisions of heavy nuclei. The ratio of charged kaons to charged pions is determined for individual central Pb+Pb collisions. After accounting for the fluctuations due to detector resolution and finite number statistics we derive an upper limit on genuine non-statistical fluctuations, perhaps related to a first or second order QCD phase transition. Such fluctuations are shown to be very small.
Afanasiev, Sergey V. ; Antičić, Tome ; Barna, Daniel ; Bartke, Jerzy ; Barton, Robert Allan ; Behler, Matthias ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blume, Christoph ; Blyth, Charles O. ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Cerny, Vladimír ; Cramer, John G. ; Csató, Péter ; Dinkelaker, Peter ; Eckardt, Volker ; Filip, Peter ; Fodor, Zoltán ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Gál, József ; Gaździcki, Marek ; Georgopoulos, George ; Gładysz-Dziaduś, Ewa ; Hegyi, Sándor ; Höhne, Claudia ; Igo, George J. ; Jones, Peter Graham ; Kadija, Krešo ; Karev, Alexandre ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lévai, Péter ; Malakhov, Aleksandr I. ; Margetis, Spyridon ; Markert, Christina ; Mayes, Bill W. ; Melkumov, Georgy L. ; Mischke, André ; Molnár, József ; Nelson, John M. ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Perl, Katarzyna ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Pühlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Retyk, Waldemar ; Roland, Christof ; Roland, Gunther ; Rybicki, Andrzej ; Sammer, Thomas ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Seyboth, Peter ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Squier, Gordon Thomas Anderson ; 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 ; Whitten, Charles A. ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimányi, József
Measurements of charged pion and kaon production in central Pb+Pb collisions at 40, 80 and 158 AGeV are presented. These are compared with data at lower and higher energies as well as with results from p+p interactions. The mean pion multiplicity per wounded nucleon increases approximately linearly with s_NN^1/4 with a change of slope starting in the region 15-40 AGeV. The change from pion suppression with respect to p+p interactions, as observed at low collision energies, to pion enhancement at high energies occurs at about 40 AGeV. A non-monotonic energy dependence of the ratio of K^+ to pi^+ yields is observed, with a maximum close to 40 AGeV and an indication of a nearly constant value at higher energies.The measured dependences may be related to an increase of the entropy production and a decrease of the strangeness to entropy ratio in central Pb+Pb collisions in the low SPS energy range, which is consistent with the hypothesis that a transient state of deconfined matter is created above these energies. Other interpretations of the data are also discussed.
Afanasiev, Sergey V. ; Antičić, Tome ; Baatar, B. ; Barna, Daniel ; Bartke, Jerzy ; Barton, Robert Allan ; Behler, Matthias ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blume, Christoph ; Blyth, Charles O. ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Černý, Vladimír ; Chvala, Ondrej ; Cramer, John G. ; Csató, Péter ; Dinkelaker, Peter ; Eckardt, Volker ; Filip, Peter ; Fodor, Zoltan ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Gál, József ; Gaździcki, Marek ; Georgopoulos, George ; Gładysz, Ewa ; Hegyi, Sándor ; Höhne, Claudia ; Igo, George J. ; Jones, Peter Graham ; Kadija, Krešo ; Karev, Alexandre ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lednicky, Richard ; Lévai, Péter ; Malakhov, Aleksandr I. ; Margetis, Spyridon ; Markert, Christina ; Mayes, Bill W. ; Melkumov, Georgy L. ; Meurer, Christine ; Mischke, André ; Mitrovski, Michael Kosta ; Molnár, József ; Nelson, John M. ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Perl, Katarzyna ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Pühlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Retyk, Waldemar ; Roland, Christof ; Roland, Gunther ; Rybicki, Andrzej ; Sammer, Thomas ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Seyboth, Peter ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Squier, Gordon Thomas Anderson ; Stock, Reinhard ; Ströbele, Herbert ; Susa, Tatjana ; Szentpétery, Imre ; Sziklai, János ; Trainor, Thomas A. ; Varga, Dezsö ; Vassiliou, Maria ; Veres, Gábor I. ; Vesztergombi, György ; Vranić, Danilo ; Wetzler, Alexander Albert ; Whitten, Charles A. ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimányi, József
Bose-Einstein correlations of charged kaons were measured near mid-rapidity in central Pb+Pb collisions at 158 A GeV by the NA49 experiment at the CERN SPS. Source radii were extracted using the Yano-Koonin-Podgoretsky and Bertsch-Pratt parameterizations. The results are compared to published pion data. The measured m_perp dependence for kaons and pions is consistent with collective transverse expansion of the source and a freeze-out time of about 9.5 fm.
Blume, Christoph ; Afanasiev, Sergey V. ; Antičić, Tome ; Baatar, B. ; Barna, Daniel ; Bartke, Jerzy ; Barton, Robert Allan ; Behler, Matthias ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blyth, Charles O. ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Černý, Vladimír ; Chvala, Ondrej ; Cramer, John G. ; Csató, Péter ; Dinkelaker, Peter ; Eckardt, Volker ; Filip, Peter ; Fischer, Hans Gerhard ; Fodor, Zoltán ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Gál, József ; Gaździcki, Marek ; Georgopoulos, George ; Gładysz, Ewa ; Hegyi, Sándor ; Höhne, Claudia ; Igo, George J. ; Jones, Peter Graham ; Kadija, Krešo ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lednický, Richard ; Lévai, Péter ; Malakhov, Aleksandr I. ; Margetis, Spyridon ; Markert, Christina ; Mayes, Bill W. ; Melkumov, Georgy L. ; Meurer, Christine ; Mischke, André ; Mitrovski, Michael Kosta ; Molnár, József ; Nelson, John M. ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Perl, Katarzyna ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Pühlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Retyk, Waldemar ; Roland, Christof ; Roland, Gunther ; Rybicki, Andrzej ; Sammer, Thomas ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Seyboth, Peter ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Smolik, Jan ; Squier, Gordon Thomas Anderson ; 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 ; Whitten, Charles A. ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimányi, József
The large acceptance and high momentum resolution as well as the significant particle identification capabilities of the NA49 experiment at the CERN SPS allow for a broad study of fluctuations and correlations in hadronic interactions. In the first part recent results on event-by-event charge and p_t fluctuations are presented. Charge fluctuations in central Pb+Pb reactions are investigated at three different beam energies (40, 80, and 158 AGeV), while for the p_t fluctuations the focus is put on the system size dependence at 158 AGeV. In the second part recent results on Bose Einstein correlations of h-h- pairs in minimum bias Pb+Pb reactions at 40 and 158 AGeV, as well as of K+K+ and K-K- pairs in central Pb+Pb collisions at 158 AGeV are shown. Additionally, other types of two particle correlations, namely pi p, Lambda p, and Lambda Lambda correlations, have been measured by the NA49 experiment. Finally, results on the energy and system size dependence of deuteron coalescence are discussed.
Mischke, André ; Afanasiev, Sergey V. ; Antičić, Tome ; Baatar, B. ; Barna, Daniel ; Bartke, Jerzy ; Barton, Robert Allan ; Behler, Matthias ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blume, Christoph ; Blyth, Charles O. ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Cerny, Vladimír ; Chvala, Ondrej ; Cramer, John G. ; Csató, Péter ; Dinkelaker, Peter ; Eckardt, Volker ; Filip, Peter ; Fischer, Hans Gerhard ; Fodor, Zoltán ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Gál, József ; Gaździcki, Marek ; Georgopoulos, George ; Gładysz-Dziaduś, Ewa ; Hegyi, Sándor ; Höhne, Claudia ; Igo, George J. ; Jones, Peter Graham ; Kadija, Krešo ; Karev, Alexandre ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lévai, Péter ; Malakhov, Aleksandr I. ; Margetis, Spyridon ; Markert, Christina ; Mayes, Bill W. ; Melkumov, Georgy L. ; Meurer, Christine ; Mischke, André ; Mitrovski, Michael Kosta ; Molnár, József ; Nelson, John M. ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Perl, Katarzyna ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Pühlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Retyk, Waldemar ; Roland, Christof ; Roland, Gunther ; Rybicki, Andrzej ; Sammer, Thomas ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Seyboth, Peter ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Squier, Gordon Thomas Anderson ; 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 ; Whitten, Charles A. ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimányi, József
Rapidity distributions for Lambda and anti-Lambda hyperons in central Pb-Pb collisions at 40, 80 and 158 AGeV and for K 0 s mesons at 158 AGeV are presented. The lambda multiplicities are studied as a function of collision energy together with AGS and RHIC measurements and compared to model predictions. A different energy dependence of the Lambda/pi and anti-Lambda/pi is observed. The anti-Lambda/Lambda ratio shows a steep increase with collision energy. Evidence for a anti-Lambda/anti-p ratio greater than 1 is found at 40 AGeV.
Leeuwen, Marco van ; Afanasiev, Sergey V. ; Antičić, Tome ; Baatar, B. ; Barna, Daniel ; Bartke, Jerzy ; Barton, Robert Allan ; Behler, Matthias ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blume, Christoph ; Blyth, Charles O. ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Černý, Vladimír ; Chvala, Ondrej ; Cramer, John G. ; Csató, Péter ; Dinkelaker, Peter ; Eckardt, Volker ; Filip, Peter ; Fischer, Hans Gerhard ; Fodor, Zoltán ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Gál, József ; Gaździcki, Marek ; Georgopoulos, George ; Gładysz, Ewa ; Hegyi, Sándor ; Höhne, Claudia ; Igo, George J. ; Jones, Peter Graham ; Kadija, Krešo ; Karev, Alexandre ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lévai, Péter ; Malakhov, Aleksandr I. ; Margetis, Spyridon ; Markert, Christina ; Mayes, Bill W. ; Melkumov, Georgy L. ; Meurer, Christine ; Mischke, André ; Mitrovski, Michael Kosta ; Molnár, József ; Nelson, John M. ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Perl, Katarzyna ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Pühlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Retyk, Waldemar ; Roland, Christof ; Roland, Gunther ; Rybicki, Andrzej ; Sammer, Thomas ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Seyboth, Peter ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Squier, Gordon Thomas Anderson ; 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 ; Whitten, Charles A. ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimányi, József
The energy dependence of hadron production in central Pb+Pb collisions is presented and discussed. In particular, midrapidity m_T-spectra for pi-, K-, K+, p, bar p, d, phi, Lambda and bar Lambda at 40, 80 and 158 AGeV are shown. In addition Xi and Omega spectra are available at 158 AGeV. The spectra allow to determine the thermal freeze-out temperature T and the transverse flow velocity beta_T at the three energies. We do not observe a significant energy dependence of these parameters; furthermore there is no indication of early thermal freeze-out of Xi and Omega at 158 AGeV. Rapidity spectra for pi-, K-, K+ and phi at 40, 80 and 158 AGeV are shown, as well as first results on Omega rapidity distributions at 158 AGeV. The chemical freeze-out parameters T and mu_B at the three energies are determined from the total yields. The parameters are close to the expected phase boundary in the SPS energy range and above. Using the total yields of kaons and lambdas, the energy dependence of the strangeness to pion ratio is discussed. A maximum in this ratio is found at 40 AGeV. This maximum could indicate the formation of deconfined matter at energies above 40 AGeV. A search for open charm in a large sample of 158 AGeV events is presented. No signal is observed. This result is compared to several model predictions.
Seyboth, Peter ; Kniege, Stefan ; Antičić, Tome ; Barna, Daniel ; Bartke, Jerzy ; Barton, Robert Allan ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blume, Christoph ; Blyth, Charles O. ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Cerny, Vladimír ; Chvala, Ondrej ; Cramer, John G. ; Csató, Péter ; Dinkelaker, Peter ; Eckardt, Volker ; Filip, Peter ; Fischer, Hans Gerhard ; Fodor, Zoltán ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Gál, József ; Gaździcki, Marek ; Georgopoulos, George ; Gładysz-Dziaduś, Ewa ; Hegyi, Sándor ; Höhne, Claudia ; Jones, Peter Graham ; Kadija, Krešo ; Karev, Alexandre ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lévai, Péter ; Malakhov, Aleksandr I. ; Markert, Christina ; Mayes, Bill W. ; Melkumov, Georgy L. ; Mischke, André ; Molnár, József ; Nelson, John M. ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Perl, Katarzyna ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Pühlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Retyk, Waldemar ; Roland, Christof ; Roland, Gunther ; Rybicki, Andrzej ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Squier, Gordon Thomas Anderson ; 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 ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimányi, József
Experiment NA49 at the Cern SPS uses a large acceptance detector for a systematic study of particle yields and correlations in nucleus-nucleus, nucleon-nucleus and nucleon-nucleon collisions. Preliminary results for Pb+Pb collisions at 40, 80 and 158 A*GeV beam energy are shown and compared to measurements at lower and higher energies.
Mischke, André ; Afanasiev, Sergey V. ; Antičić, Tome ; Baatar, B. ; Barna, Daniel ; Bartke, Jerzy ; Barton, Robert Allan ; Betev, Latchezar ; Białkowska, Helena ; Billmeier, Anja ; Blyth, Charles O. ; Blume, Christoph ; Boimska, Bożena ; Botje, Michiel ; Bracinik, Juraj ; Bramm, Roland ; Brun, René ; Bunčić, Predrag ; Cerny, Vladimír ; Chvala, Ondrej ; Cramer, John G. ; Csató, Péter ; 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 ; Igo, George J. ; Jones, Peter Graham ; Kadija, Krešo ; Karev, Alexandre ; Kolesnikov, Vadim I. ; Kollegger, Thorsten ; Kowalski, Marek ; Kraus, Ingrid ; Kreps, Michal ; Leeuwen, Marco van ; Lévai, Péter ; Malakhov, Aleksandr I. ; Margetis, Spyridon ; Markert, Christina ; Mayes, Bill W. ; Melkumov, Georgy L. ; Meurer, Christine ; Mitrovski, Michael Kosta ; Molnár, József ; Nelson, John M. ; Pálla, Gabriella ; Panagiotou, Apostolos D. ; Perl, Katarzyna ; Petridis, Athanasios ; Pikna, Miroslav ; Pinsky, Lawrence ; Pühlhofer, Falk ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Retyk, Waldemar ; Roland, Christof ; Roland, Gunther ; Rybicki, Andrzej ; Sammer, Thomas ; Sandoval, Andres ; Sann, Hans ; Schmitz, Norbert ; Seyboth, Peter ; Siklér, Ferenc ; Sitar, Branislav ; Skrzypczak, Ewa ; Squier, Gordon Thomas Anderson ; 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 ; Whitten, Charles A. ; Yoo, In-Kwon ; Zaranek, Jacek ; Zimányi, József
Rapidity distributions for $\Lambda$ and $\bar{\Lambda}$ hyperons in central Pb-Pb collisions at 40, 80 and 158 A$\cdot$GeV and for ${\rm K}_{s}^{0}$ mesons at 158 A$\cdot$GeV are presented. The lambda multiplicities are studied as a function of collision energy together with AGS and RHIC measurements and compared to model predictions. A different energy dependence of the $\Lambda/\pi$ and $\bar{\Lambda}/\pi$ is observed. The $\bar{\Lambda}/\Lambda$ ratio shows a steep increase with collision energy. Evidence for a $\bar{\Lambda}/\bar{\rm p}$ ratio greater than 1 is found at 40 A$\cdot$GeV.
Abelev, Betty ; Adam, Jaroslav ; Adamová, Dagmar ; Aggarwal, Madan Mohan ; Aglieri Rinella, Gianluca ; Agnello, Michelangelo ; Agocs, Andras Gabor ; Agostinelli, A. ; Agrawal, Neelima ; Ahammed, Zubayer ; Ahmad, Nazeer ; Ahmad Masoodi, A. ; Ahmed, I. ; Ahn, Sang Un ; Ahn, S. A. ; Aimo, Ilaria ; Aiola, Salvatore ; Ajaz, Muhammad ; Akindinov, Alexander ; Aleksandrov, Dmitry ; Alessandro, Bruno ; Alexandre, Didier ; Alici, Andrea ; Alkin, Anton ; Alme, Johan ; Alt, Torsten ; Altini, Valerio ; Altinpinar, Sedat ; Altsybeev, Igor ; Prado, Caio Alves Garcia ; Andrei, Cristian ; Andronic, Anton ; Anguelov, Venelin ; Anielski, Jonas ; Antičić, Tome ; Antinori, Federico ; Antonioli, Pietro ; Aphecetche, Laurent Bernard ; Appelshäuser, Harald ; Arbor, N. ; Arcelli, Silvia ; Armesto, Néstor ; Arnaldi, Roberta ; Aronsson, Tomas Robert ; Arsene, Ionut Cristian ; Arslandok, Mesut ; Augustinus, Andre ; Averbeck, Ralf Peter ; Awes, Terry C. ; Azmi, Mohd Danish ; Bach, Matthias ; Badalà, Angela ; Baek, Yong Wook ; Bagnasco, Stefano ; Bailhache, Raphaëlle ; Bairathi, Vipul ; Bala, Renu ; Baldisseri, Alberto ; Baltasar Dos Santos Pedrosa, Fernando ; Bán, J. ; Baral, Rama Chandra ; Barbera, Roberto ; Barile, Francesco ; Barnaföldi, Gergely Gábor ; Barnby, Lee Stuart ; Barret, Valerie ; Bartke, Jerzy ; Basile, Maurizio ; Bastid, Nicole ; Basu, Sumit ; Bathen, Bastian ; Batigne, Guillaume ; Batyunya, Boris ; Bätzing, Paul Christoph ; Baumann, C. ; Bearden, Ian Gardner ; Beck, Hans ; Bedda, Cristina ; Behera, Nirbhay Kumar ; Belikov, Iouri ; Bellini, Francesca ; Bellwied, Rene ; Belmont-Moreno, Ernesto ; Bencédi, Gyula ; Beolè, Stefania ; Berceanu, Ionela ; Barnaföldi, Gergely Gábor ; Barnby, Lee Stuart ; Barret, Valerie ; Bartke, Jerzy ; Basile, Maurizio ; Bastid, Nicole ; Basu, Sumit ; Bathen, Bastian ; Batigne, Guillaume ; Batyunya, Boris ; Bätzing, Paul Christoph ; Baumann, C. ; Bearden, Ian Gardner ; Beck, Hans ; Bedda, Cristina ; Behera, Nirbhay Kumar ; Belikov, Iouri ; Bellini, Francesca ; Bellwied, Rene ; Belmont-Moreno, Ernesto ; Bencédi, Gyula ; Beolè, Stefania ; Berceanu, Ionela ; Bogolyubsky, M. ; Boldizsár, László ; Bombara, Marek ; Book, Julian ; Borel, Hervé ; Borissov, Alexander ; Bornschein, Jörg ; Bossú, Francesco ; Botje, Michiel ; Botta, Elena ; Böttger, Stefan ; Braun-Munzinger, Peter ; Bregant, Marco ; Breitner, Timo ; Broker, Theo Alexander ; Browning, Tyler Allen ; Broz, Michal ; Bruna, Elena ; Bruno, Giuseppe Eugenio ; Budnikov, Dmitry ; Büsching, Henner ; Bufalino, Stefania ; Bunčić, Predrag ; Busch, Oliver ; Buthelezi, Edith Zinhle ; Caffarri, Davide ; Cai, Xiao ; Caines, Helen Louise ; Caliva, Alberto ; Calvo Villar, Ernesto ; Camerini, Paolo ; Canoa Roman, V. ; Carena, Francesco ; Carena, Wisla ; Carminati, Federico ; Casanova Díaz, Amaya Ofelia ; Castillo Castellanos, Javier Ernesto ; Casula, Ester Anna Rita ; Catanescu, V. ; Cavicchioli, Costanza ; Ceballos Sanchez, Cesar ; Čepila, Jan ; Cerello, Piergiorgio ; Chang, Beom-Su ; Chapeland, Sylvain ; Charvet, Jean-Luc Fernand ; Chattopadhyay, Subhasis ; Chattopadhyay, Sukalyan ; Cherney, Michael Gerard ; Cheshkov, Cvetan Valeriev ; Cheynis, Brigitte ; Chibante Barroso, Vasco Miguel ; Chinellato, David Dobrigkeit ; Chochula, Peter ; Chojnacki, Marek ; Choudhury, Subikash ; Christakoglou, Panagiotis ; Christensen, Christian Holm ; Christiansen, Peter L. ; Chujo, Tatsuya ; Chung, Suh-Urk ; Cicalò, Corrado ; Cifarelli, Luisa ; Cindolo, Federico ; Cleymans, Jean Willy Andre ; Colamaria, Fabio Filippo ; Colella, Domenico ; Collu, Alberto ; Colocci, Manuel ; Conesa Balbastre, Gustavo ; Conesa del Valle, Zaida ; Connors, Megan Elizabeth ; Contin, Giacomo ; Contreras Nuno, Jesus Guillermo ; Cormier, Thomas Michael ; Corrales Morales, Yasser ; Cortese, Pietro ; Cortés Maldonado, Ismael ; Cosentino, Mauro Rogerio ; Costa, Filippo ; Crochet, Philippe ; Cruz Albino, Rigoberto ; Cuautle Flores, Eleazar ; Cunqueiro Mendez, Leticia ; Dainese, Andrea ; Dang, R. ; Danu, Andrea ; Das, Debasish ; Das, Indranil ; Das, K. ; Das, S. ; Dash, Ajay Kumar ; Dash, Sadhana ; De, Sudipan ; Delagrange, H. ; Deloff, Andrzej ; Dénes, Ervin Sandor ; D’Erasmo, Ginevra ; Barros, Gabriel Oliveira Valeriano de ; De Caro, Annalisa ; De Cataldo, Giacinto ; Cuveland, Jan de ; De Falco, Alessandro ; De Gruttola, Daniele ; De Marco, Nora ; De Pasquale, Salvatore ; de Rooij, R. ; Diaz Corchero, Miguel Angel ; Dietel, Thomas ; Divià, Roberto ; Di Bari, Domenico ; Di Liberto, S. ; Di Mauro, Antonio ; Di Nezza, Pasquale ; Djuvsland, Øystein ; Dobrin, Alexandru Florin ; Dobrowolski, Tadeusz Antoni ; Domenicis Gimenez, Diogenes ; Dönigus, Benjamin ; Dordic, Olja ; Dorheim, Sverre ; Dubey, Anand Kumar ; Dubla, Andrea ; Ducroux, Laurent ; Dupieux, Pascal ; Dutta Majumdar, Abhee Kanti ; Elia, Domenico ; Engel, Heiko ; Erazmus, Barbara Ewa ; Erdal, H. 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P. ; Maire, Antonin ; Malaev, Mikhail ; Maldonado Cervantes, Ivonne Alicia ; Malinina, Liudmila ; Mal'Kevich, Dmitry ; Malzacher, Peter ; Mamonov, Alexander ; Manceau, Loic Henri Antoine ; Manko, Vladislav ; Manso, Franck ; Manzari, Vito ; Marchisone, Massimiliano ; Mareš, Jiří ; Margagliotti, Giacomo Vito ; Margotti, Anselmo ; Marín, Ana ; Markert, Christina ; Marquard, Marco ; Martashvili, Irakli ; Martin, Nicole Alice ; Martinengo, Paolo ; Martínez Hernández, Mario Iván ; Martínez Garcia, Ginés ; Martin Blanco, Javier ; Martynov, Yevgen ; Mas, Alexis Jean-Michel ; Masciocchi, Silvia ; Masera, Massimo ; Masoni, Alberto ; Massacrier, Laure Marie ; Mastroserio, Annalisa ; Matyja, Adam Tomasz ; Mayer, Christoph ; Mazer, Joel Anthony ; Mazumder, Rakesh ; Mazzoni, Alessandra Maria ; Meddi, Franco ; Menchaca-Rocha, Arturo Alejandro ; Mercado Pérez, Jorge ; Meres, Michal ; Miake, Yasuo ; Mikhaylov, Konstantin ; Milano, Leonardo ; Milošević, Jovan ; Mischke, André ; Mishra, Aditya Nath ; Miśkowiec, Dariusz Czesław ; Mitu, Ciprian Mihai ; Mlynarz, J. ; Mohanty, Bedangadas ; Molnar, Levente ; Montaño Zetina, Luis Manuel ; Montes Prado, Esther ; Morando, Maurizio ; Godoy, Denise Aparecida Moreira de ; Moretto, Sandra ; Morreale, Astrid ; Morsch, Andreas ; Muccifora, Valeria ; Mudnic, Eugen ; Muhuri, Sanjib ; Mukherjee, Maitreyee ; Müller, H. ; Munhoz, Marcelo Gameiro ; Murray, Sean ; Musa, Luciano ; Musinsky, Jan ; Nandi, Basanta Kumar ; Nania, Rosario ; Nappi, Eugenio ; Nattrass, Christine ; Nayak, Tapan Kumar ; Nazarenko, Sergey ; Nedosekin, Alexander ; Nicassio, Maria ; Niculescu, Mihai ; Nielsen, Borge Svane ; Nikolaev, Sergey ; Nikulin, Sergey ; Nikulin, Vladimir ; Nilsen, B. 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Crispin S. ; Windelband, Bernd ; Winn, Michael Andreas ; Xiang, C. ; Yaldo, Chris G. ; Yamaguchi, Yorito ; Yang, H. ; Yang, Ping ; Yang, S. ; Yano, Satoshi ; Yasnopolskiy, Stanislav ; Yi, J. ; Yin, Zhongbao ; Yoo, In-Kwon ; Yushmanov, Igor E. ; Zaccolo, Valentina ; Zach, C. ; Zaman, Ali ; Zampolli, Chiara ; Zaporozhets, Sergey ; Zarochentsev, Andrey ; Závada, Petr ; Zaviyalov, Nikolaj ; Zbroszczyk, Hanna Paulina ; Zgura, Ion-Sorin ; Zhalov, Mikhail ; Zhang, F. ; Zhang, Haitao ; Zhang, Xiaoming ; Zhang, Y. ; Zhao, Chengxin ; Zhou, Daicui ; Zhou, F. ; Zhou, You ; Zhu, Hongsheng ; Zhu, Jianhui ; Zhu, Jianhui ; Zhu, X. ; Zichichi, Antonino ; Zimmermann, A. ; Zimmermann, Markus ; Zinovjev, Gennady M. ; Zoccarato, Yannick Denis ; Zynovyev, Mykhaylo ; Zyzak, Maksym
A measurement of the transverse momentum spectra of jets in Pb-Pb collisions at sNN−−−√=2.76 TeV is reported. Jets are reconstructed from charged particles using the anti-kT jet algorithm with jet resolution parameters R of 0.2 and 0.3 in pseudo-rapidity |η|<0.5. The transverse momentum pT of charged particles is measured down to 0.15 GeV/c which gives access to the low pT fragments of the jet. Jets found in heavy-ion collisions are corrected event-by-event for average background density and on an inclusive basis (via unfolding) for residual background fluctuations and detector effects. A strong suppression of jet production in central events with respect to peripheral events is observed. The suppression is found to be similar to the suppression of charged hadrons, which suggests that substantial energy is radiated at angles larger than the jet resolution parameter R=0.3 considered in the analysis. The fragmentation bias introduced by selecting jets with a high pT leading particle, which rejects jets with a soft fragmentation pattern, has a similar effect on the jet yield for central and peripheral events. The ratio of jet spectra with R=0.2 and R=0.3 is found to be similar in Pb-Pb and simulated PYTHIA pp events, indicating no strong broadening of the radial jet structure in the reconstructed jets with R<0.3.
Appelshäuser, Harald ; Bächler, Joachim ; Bailey, Stephen John ; Barnby, Lee Stuart ; Bartke, Jerzy ; Barton, Robert Allan ; Białkowska, Helena ; Billmeier, Anja ; Blyth, Charles O. ; Bock, Rudolf ; Bormann, Christian ; Brady, Franklin Paul ; Brockmann, Robert ; Brun, René ; Bunčić, Predrag ; Caines, Helen Louise ; Cebra, Daniel A. ; Cooper, Glenn E. ; Cramer, John G. ; Csato, Peter ; Dunn, Jason ; Eckardt, Volker ; Eckhardt, Frank ; Ferguson, M. I. ; Fischer, Hans Gerhard ; Flierl, Dominik Bernhard ; Fodor, Zoltan ; Foka, Panagiota ; Freund, Peter ; Friese, Volker ; Fuchs, Matthias ; Gabler, Frank ; Gal, Jozsef ; Gaździcki, Marek ; Gładysz-Dziaduś, Ewa ; Grebieszkow, Jaroslaw ; Günther, Jörg ; Harris, John W. ; Hegyi, Sandor ; Henkel, Torsten ; Hill, L. A. ; Huang, Isaac ; Hümmler, Holm Gero ; Igo, George J. ; Irmscher, Detlef ; Jacobs, Peter Martin ; Jones, Peter Graham ; Kadija, Krešo ; Kolesnikov, Vadim I. ; Kowalski, Marek ; Lasiuk, Brian ; Lévai, Peter ; Malakhov, Aleksandr I. ; Margetis, Spyridon ; Markert, Christina ; Melkumov, Georgy L. ; Mock, Andreas ; Molnár, József ; Nelson, John M. ; Oldenburg, Markus D. ; Odyniec, Grazyna Janina ; Palla, Gabriella ; Panagiotou, Apostolos D. ; Petridis, Athanasios ; Piper, Andreas ; Porter, R. Jefferson ; Poskanzer, Arthur M. ; Poziombka, Stefan ; Prindle, Duncan J. ; Pühlhofer, Falk ; Rauch, Wolfgang Hans ; Reid, Jeffrey G. ; Renfordt, Rainer Arno Ernst ; Retyk, Waldemar ; Ritter, Hans Georg ; Röhrich, Dieter ; Roland, Christof ; Roland, Gunther ; Rudolph, Heinrich ; Rybicki, Andrzej ; Sandoval, Andres ; Sann, Hans ; Semenov, Alexei Yu. ; Schäfer, Erich ; Schmischke, Dirk ; Schmitz, Norbert ; Schönfelder, Stefan ; Seyboth, Peter ; Seyerlein, Jürgen ; Sikler, Ferenc ; Skrzypczak, Ewa ; Squier, Gordon Thomas Anderson ; Stock, Reinhard ; Ströbele, Herbert ; Szentpetery, Imre ; Sziklay, Janos ; Toy, Milton Y. ; Trainor, Thomas A. ; Trentalage, Stephen ; Ullrich, Thomas ; Vassiliou, Maria ; Vesztergombi, György ; Voloshin, Sergei ; Vranić, Danilo ; Wang, Feipeng ; Weerasundara, Dhammika D. ; Wenig, Siegfried ; Whitten, Charles A. ; Wienold, Thomas ; Wood, Lindsay ; Yates, Tim A. ; Xu, Nu ; Zimanyi, Jozsef ; Zhu, Xue-Zhou ; Zybert, Ryszard
Two-particle correlation functions of negative hadrons over wide phase space, and transverse mass spectra of negative hadrons and deuterons near mid-rapidity have been measured in central Pb+Pb collisions at 158 GeV per nucleon by the NA49 experiment at the CERN SPS. A novel Coulomb correction procedure for the negative two-particle correlations is employed making use of the measured oppositely charged particle correlation. Within an expanding source scenario these results are used to extract the dynamic characteristics of the hadronic source, resolving the ambiguities between the temperature and transverse expansion velocity of the source, that are unavoidable when single and two particle spectra are analysed separately. The source shape, the total duration of the source expansion, the duration of particle emission, the freeze-out temperature and the longitudinal and transverse expansion velocities are deduced.