Ερευνητικό υλικό ΕΚΠΑ

Energy and centrality dependence of (p)over-bar and p production and the
(Lambda)over-bar/(p)over-bar ratio in Pb plus Pb collisions between 20A
GeV and 158A GeV

Αγγλικά

The transverse mass m(t) distributions for antiprotons are measured at
midrapidity for minimum bias Pb+Pb collisions at 158A GeV and for
central Pb+Pb collisions at 20A, 30A, 40A, and 80A GeV beam energies in
the fixed target experiment NA49 at the CERN SPS. The rapidity density
dn/dy, inverse slope parameter T, and mean transverse mass < m(t)>
derived from the m(t) distributions are studied as a function of the
incident energy and the collision centrality and compared to the
relevant data on proton production. The shapes of the m(t) distributions
of (p) over bar and p are very similar. The ratios of the particle
yields, (p) over bar /p and (p) over bar/(Lambda) over bar, are also
analyzed. The (p) over bar /p ratio exhibits an increase with decreasing
centrality and a steep rise with increasing beam energy. The (Lambda)
over bar/(Lambda) over bar ratio increases beyond unity with decreasing
beam energy.

2006

Alt, C
Anticic, T
Baatar, B
Barna, D
Bartke, J and
Betev, L
Bialkowska, H
Blume, C
Boimska, B
Botje, M and
Bracinik, J
Bramm, R
Buncic, P
Cerny, V
Christakoglou, P
and Chvala, O
Cramer, JG
Csato, P
Dinkelaker, P
Eckardt,
V
Flierl, D
Fodor, Z
Foka, P
Friese, V
Gal, J and
Gazdzicki, M
Genchev, V
Georgopoulos, G
Gladysz, E and
Grebieszkow, K
Hegyi, S
Hohne, C
Kadija, K
Karev, A and
Kliemant, M
Kniege, S
Kolesnikov, VI
Kornas, E
Korus, R
and Kowalski, M
Kraus, I
Kreps, M
Laslo, A
van Leeuwen,
M
Levai, P
Litov, L
Lungwitz, B
Makariev, M and
Malakhov, AI
Mateev, M
Melkumov, GL
Mischke, A and
Mitrovski, M
Molnar, J
Mrowczynski, S
Nicolic, V
Palla,
G
Panagiotou, AD
Panayotov, D
Petridis, A
Pikna, M and
Prindle, D
Puhlhofer, F
Renfordt, R
Roland, C
Roland, G
and Rybczynski, M
Rybicki, A
Sandoval, A
Schmitz, N and
Schuster, T
Seyboth, P
Sikler, F
Sitar, B
Skrzypczak, E
and Stefanek, G
Stock, R
Strabel, C
Strobele, H
Susa, T
and Szentpetery, I
Sziklai, J
Szymanski, P
Trubnikov, V and
Varga, D
Vassiliou, M
Veres, GI
Vesztergombi, G
Vranic,
D
Wetzler, A
Wlodarczyk, Z
Yoo, IK
Zimanyi, J
NA49
Collaborat

Physical Review C

AMER PHYSICAL SOC

73

4

https://doi.org/10.1103/PhysRevC.73.044910

10.1103/PhysRevC.73.044910

https://pergamos.lib.uoa.gr/uoa/dl/object/3099260