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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.
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.