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Alt C, Anticic T, Baatar B, Barna D, Bartke J, Betev L, Białkowska H, Billmeier A, Blume C, Boimska B, Botje M, Bracinik J, Bramm R, Brun R, Buncić P, Cerny V, Christakoglou P, Chvala O, Cramer JG, Csató P, Darmenov N, Dimitrov A, Dinkelaker P, Eckardt V, Farantatos G, Flierl D, Fodor Z, Foka P, Freund P, Friese V, Gál J, Gaździcki M, Georgopoulos G, Gładysz E, Grebieszkow K, Hegyi S, Höhne C, Kadija K, Karev A, Kliemant M, Kniege S, Kolesnikov VI, Kollegger T, Kornas E, Korus R, Kowalski M, Kraus I, Kreps M, van Leeuwen M, Lévai P, Litov L, Lungwitz B, Makariev M, Malakhov AI, Markert C, Mateev M, Mayes BW, Melkumov GL, Meurer C, Mischke A, Mitrovski M, Molnár J, Mrówczyński S, Pálla G, Panagiotou AD, Panayotov D, Petridis A, Pikna M, Pinsky L, Pühlhofer F, Reid JG, Renfordt R, Richard A, Roland C, Roland G, Rybczyński M, Rybicki A, Sandoval A, Sann H, Schmitz N, Seyboth P, Siklér F, Sitar B, Skrzypczak E, Stefanek G, Stock R, Ströbele H, Susa T, Szentpétery I, Sziklai J, Trainor TA, Varga D, Vassiliou M, Veres GI, Vesztergombi G, Vranić D, Wetzler A, Włodarczyk Z, Yoo IK, Zaranek J, Zimányi J. Omega- and Omega+ production in central Pb + Pb collisions at 40 and 158A GeV. Phys Rev Lett 2005; 94:192301. [PMID: 16090164 DOI: 10.1103/physrevlett.94.192301] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2004] [Indexed: 05/03/2023]
Abstract
Results are presented on Omega production in central Pb+Pb collisions at 40 and 158A GeV beam energy. For the first time in heavy ion reactions, rapidity distributions and total yields were measured for the sum Omega(-) + Omega(+) at 40A GeV and for Omega(-) and Omega(+) separately at 158A GeV. The yields are strongly underpredicted by the string-hadronic UrQMD model but agree better with predictions from hadron gas models.
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Affiliation(s)
- C Alt
- Fachbereich Physik der Universität, Frankfurt, Germany
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Alt C, Anticic T, Baatar B, Barna D, Bartke J, Betev L, Białkowska H, Billmeier A, Blume C, Boimska B, Botje M, Bracinik J, Bramm R, Brun R, Buncić P, Cerny V, Christakoglou P, Chvala O, Cramer JG, Csató P, Darmenov N, Dimitrov A, Dinkelaker P, Eckardt V, Farantatos G, Flierl D, Fodor Z, Foka P, Freund P, Friese V, Gál J, Gaździcki M, Georgopoulos G, Gładysz E, Grebieszkow K, Hegyi S, Höhne C, Kadija K, Karev A, Kliemant M, Kniege S, Kolesnikov VI, Kollegger T, Kornas E, Korus R, Kowalski M, Kraus I, Kreps M, van Leeuwen M, Lévai P, Litov L, Lungwitz B, Makariev M, Malakhov AI, Markert C, Mateev M, Mayes BW, Melkumov GL, Meurer C, Mischke A, Mitrovski M, Molnár J, Mrówczyński S, Pálla G, Panagiotou AD, Panayotov D, Petridis A, Pikna M, Pinsky L, Pühlhofer F, Reid JG, Renfordt R, Richard A, Roland C, Roland G, Rybczyński M, Rybicki A, Sandoval A, Sann H, Schmitz N, Seyboth P, Siklér F, Sitar B, Skrzypczak E, Stefanek G, Stock R, Ströbele H, Susa T, Szentpétery I, Sziklai J, Trainor TA, Trubnikov V, Varga D, Vassiliou M, Veres GI, Vesztergombi G, Vranić D, Wetzler A, Włodarczyk Z, Yoo IK, Zaranek J, Zimányi J. System-size dependence of strangeness production in nucleus-nucleus collisions at squareroot[sNN]=17.3 GeV. Phys Rev Lett 2005; 94:052301. [PMID: 15783629 DOI: 10.1103/physrevlett.94.052301] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2004] [Indexed: 05/24/2023]
Abstract
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 the onset of the formation of coherent systems of increasing size.
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Affiliation(s)
- C Alt
- Fachbereich Physik der Universität, Frankfurt, Germany
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Anticic T, Baatar B, Barna D, Bartke J, Behler M, Betev L, Białkowska H, Billmeier A, Blume C, Boimska B, Botje M, Bracinik J, Bramm R, Brun R, Buncić P, Cerny V, Christakoglou P, Chvala O, Cramer JG, Csató P, Darmenov N, Dimitrov A, Dinkelaker P, Eckardt V, Filip P, Flierl D, Fodor Z, Foka P, Freund P, Friese V, Gál J, Gaździcki M, Georgopoulos G, Gładysz E, Hegyi S, Höhne C, Kadija K, Karev A, Kolesnikov VI, Kollegger T, Kornas E, Korus R, Kowalski M, Kraus I, Kreps M, van Leeuwen M, Lévai P, Litov L, Makariev M, Malakhov AI, Markert C, Mateev M, Mayes BW, Melkumov GL, Meurer C, Mischke A, Mitrovski M, Molnár J, Mrówczyński S, Pálla G, Panagiotou AD, Panayotov D, Perl K, Petridis A, Pikna M, Pinsky L, Pühlhofer F, Reid JG, Renfordt R, Retyk W, Roland C, Roland G, Rybczyński M, Rybicki A, Sandoval A, Sann H, Schmitz N, Seyboth P, Siklér F, Sitar B, Skrzypczak E, Stefanek G, Stock R, Ströbele H, Susa T, Szentpétery I, Sziklai J, Trainor TA, Varga D, Vassiliou M, Veres GI, Vesztergombi G, Vranić D, Wetzler A, Włodarczyk Z, Yoo IK, Zaranek J, Zimányi J. Lambda and lambda production in central Pb-Pb collisions at 40, 80, and 158A GeV. Phys Rev Lett 2004; 93:022302. [PMID: 15323906 DOI: 10.1103/physrevlett.93.022302] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2003] [Indexed: 05/24/2023]
Abstract
Production of Lambda and Antilambda hyperons was measured in central Pb-Pb collisions at 40, 80, and 158A GeV beam energy on a fixed target. Transverse mass spectra and rapidity distributions are given for all three energies. The Lambda/pi ratio at midrapidity and in full phase space shows a pronounced maximum between the highest BNL Alternating Gradient Synchrotron and 40A GeV CERN Super Proton Synchrotron energies, whereas the Lambda/pi ratio exhibits a monotonic increase.
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Affiliation(s)
- T Anticic
- Rudjer Boskovic Institute, Zagreb, Croatia
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Alt C, Anticic T, Baatar B, Barna D, Bartke J, Betev L, Białkowska H, Billmeier A, Blume C, Boimska B, Botje M, Bracinik J, Bramm R, Brun R, Buncić P, Cerny V, Christakoglou P, Chvala O, Cramer JG, Csató P, Darmenov N, Dimitrov A, Dinkelaker P, Eckardt V, Farantatos G, Filip P, Flierl D, Fodor Z, Foka P, Freund P, Friese V, Gál J, Gaździcki M, Georgopoulos G, Gładysz E, Hegyi S, Höhne C, Kadija K, Karev A, Kniege S, Kolesnikov VI, Kollegger T, Korus R, Kowalski M, Kraus I, Kreps M, van Leeuwen M, Lévai P, Litov L, Makariev M, Malakhov AI, Markert C, Mateev M, Mayes BW, Melkumov GL, Meurer C, Mischke A, Mitrovski M, Molnár J, Mrówczyński S, Pálla G, Panagiotou AD, Panayotov D, Perl K, Petridis A, Pikna M, Pinsky L, Pühlhofer F, Reid JG, Renfordt R, Retyk W, Roland C, Roland G, Rybczyński M, Rybicki A, Sandoval A, Sann H, Schmitz N, Seyboth P, Siklér F, Sitar B, Skrzypczak E, Stefanek G, Stock R, Ströbele H, Susa T, Szentpétery I, Sziklai J, Trainor TA, Varga D, Vassiliou M, Veres GI, Vesztergombi G, Vranić D, Wetzler A, Włodarczyk Z, Yoo IK, Zaranek J, Zimányi J. Evidence for an exotic S= -2, Q= -2 baryon resonance in proton-proton collisions at the CERN SPS. Phys Rev Lett 2004; 92:042003. [PMID: 14995366 DOI: 10.1103/physrevlett.92.042003] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2003] [Indexed: 05/24/2023]
Abstract
Results of resonance searches in the Xi(-)pi(-), Xi(-)pi(+), Xi;(+)pi(-), and Xi;(+)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 above 4.2sigma. This state is a candidate for the hypothetical exotic Xi(--)(3/2) baryon with S=-2, I=3 / 2, and a quark content of (dsdsū). At the same mass, a peak is observed in the Xi(-)pi(+) spectrum which is a candidate for the Xi(0)(3/2) member of this isospin quartet with a quark content of (dsus[-]d). The corresponding antibaryon spectra also show enhancements at the same invariant mass.
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Affiliation(s)
- C Alt
- Fachbereich Physik der Universität, D-60486 Frankfurt, Germany
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Abdrahmanov EO, Basina AN, Chasnikov IY, Gaitinov AS, Streltsov IS, Vinitsky AK, Abdinov OB, Mehtiev RR, Backović S, Drndarević S, Krpić D, Sakota V, Balea E, Balea O, Boldea V, Hakman S, Ponta T, Gemesy T, Krasznovszky S, Pinter D, Kowalski M, Angelov N, Anoshin AI, Ahababian N, Baatar T, Baldin AM, Bartke J, Cheplakov AP, Didenko LA, Dzhmukhadze SV, Gasparian AP, Grecova LD, Grigalashvili NS, Grishin VG, Ivanovskaja IA, Jenik L, Kanarek T, Kladnitskaya EN, Kopylova DK, Lyubimov VB, Lyutov SI, Melnikova NN, Nikitina VF, Popova VM, Shcheglova LM, Shklovskaya AI, Solomin AN, Soloviev MI, Sulejmanov MK, Toneeva GP, Tuvdendorzh D, Erofeeva IN, Murzin VS, Smirnova LN, Korbel Z, Trka Z, Trkova Y, Kerachev P, markov P, Semerdzhiev H, Azimov SA, Inogamov SV, Turdaliev KT, Yuldashev AA, Yuldashev BS, Amaglobeli NS, Dasaeva MA, Makharadze TG, Tevzadze YV, Topuridze MV, Tsivtsivadze ET, Chadraa B, Dalkhazhav N, Togoo R, Armutlijsky D, Prokopeva S, Białkowska H, Kiełczewska D, Lang K, Ahababian NM, Gulkanian GR, Kirakosian ZA, Korchagin SA, Vartanian VA. Interaction cross sections and negative pion multiplicities in nucleus-nucleus collisions at 4.2 GeV/c per nucleon. ACTA ACUST UNITED AC 1980. [DOI: 10.1007/bf01546951] [Citation(s) in RCA: 41] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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