0308739 - ÚJF 2008 RIV DE eng J - Journal Article
Aggarwal, M. M. - Petráček, Vojtěch - Šumbera, Michal
Pion freeze-out time in Pb plus Pb collisions at 158 AGeV/c studied via pi(-)/pi(+) and K-/K+ ratios.
[Čas vymrznutí pionů v Pb plus Pb srážkách při 158 AGeV/c studované pomocí poměrů pi(-)/pi(+) a K-/K+.]
European Physical Journal C. Roč. 48, č. 2 (2006), s. 343-352. ISSN 1434-6044. E-ISSN 1434-6052
R&D Projects: GA MŠMT 1P04LA211
Institutional research plan: CEZ:AV0Z10480505
Keywords : heavy ion collisions * pion freeze -out * WA98
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 3.251, year: 2006

he effect of the final state Coulomb interaction on particles produced in Pb + Pb collisions at 158AGeV/c has been investigated in the WA98 experiment through the study of the pi(-)/pi(+) and K-/K+ ratios measured as a function of T-m- (m)0. While the ratio for kaons shows no significant T-m dependence, the pi(-)/pi(+) ratio is enhanced at small T-m - (m)0 values with an enhancement that increases with centrality. A silicon pad detector located near the target is used to estimate the contribution of hyperon decays to the pi(-)/pi(+) ratio. The comparison of results with predictions of the RQMD model in which the Coulomb interaction has been incorporated allows to place constraints on the time of the pion freeze-out.

Čas vymrznutí pionů v Pb plus Pb srážkách při 158 AGeV/c studované pomocí poměrů pi(-)/pi(+) a K-/K+ v experimentu WA98.
Permanent Link: http://hdl.handle.net/11104/0161121