Xi (Omega) Production in Pb+Pb Collisions at 158 GeV/c (CROSBI ID 77403)
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Podaci o odgovornosti
Odyniec, G ; Afanasiev, S.V ; Alber, T ; Appelshäuser, H ; Bächler, J ; Bailey, S.J ; Barnby, L.S ; Bartke, J ; Bialkowska, H ; Blyth, C.O ; Bock, R ; Bormann, C ; Brady, F.P ; Brockmann, R ; Bunčić N ; Bunčić, P ; Caines, H.L ; Cebra, D ; Chan, P ; Cooper, G.E ; Cramer, J.G ; Cramer, P B ; Csato, P ; Dietz, O ; Dunn, J ; Eckardt, V ; Eckhardt, F ; Ferguson, M.I ; Fischer, H.G ; Flierl, D ; Fodor, Z ; Foka, P ; Freund, P ; Friese, V ; Fuchs, M ; Gabler, F ; Gal, J ; Gazdzicki, M ; Gadysz, E ; Grebieszkow, J ; Günther, J ; Harris, J.W ; Hegyi, S ; Henkel, T ; Hill, L.A ; Huang, I ; Howe, M.A ; Hümmler, H ; Igo, G ; Irmscher, D ; Jacobs, P ; Jones, P.G ; Kadija, Krešo ; Kolesnikov, V.I ; Konashenok, A ; Kowalski, M ; Lasiuk, B ; Lévai, P ; Malakhov, A.I ; Margetis, S ; Markert, C ; Melkumov, G.L ; Mock, A ; Molnár, J ; Nelson, J.M ; Odyniec, G ; Palla, G ; Panagiotou, A.D ; Petridis, A ; Piper, A ; Porter, R.J ; Poskanzer, A.M ; Poziombka, S ; Prindle, D.J ; Pühlhofer, F ; Rauch, W ; Reid, J.G ; Renfordt, R ; Retyk, W ; Ritter, H.G ; Röhrich, D ; Roland, C ; Roland, G ; Rudolph, H ; Rybicki, A
engleski
Xi (Omega) Production in Pb+Pb Collisions at 158 GeV/c
Using the NA49 main TPC, the central production of Xi+antiXi hyperons has been measured in CERN SPS Pb on Pb collisions at 158 GeV/c. The preliminary (Xi+antiXi)/(Lambda+antiLambda) ratio, studied at 2.0.gt.y.lt. 2.6 and 1.gt.p_T.lt.3 GeV/c, equals ~(13+/-4) %(systematic error only). It is compatible, within errors, with the previously obtained ratios for central S+S, S+W, and S+Au collisions. The fit to the transverse momentum distribution resulted in an inverse slope parameter T of 297 MeV. At this level of statistics we do not see any noticeable enhancement of hyperon production with the increased volume (and, possibly, degree of equilibration) of the system from S+S to Pb+Pb. This result is unexpected and counterintuitive, and should be further investigated. If confirmed, it will have a significant impact on our understanding of mechanisms leading to the enhanced strangeness production in heavy ion collisions.
NA49; heavy ion; Xi; TPC; time projection chamber; Pb+Pb
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