Pion freeze-out time in Pb+Pb collisions at 158AGeV/c studied via π-/π+ and K-/K+ ratios
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2006
Authors
Geurts, F.J.M.
Kamermans, R.
Peitzmann, T.
van der Pijll, E.C.
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Abstract
The 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 π-/π+ and K-/K+ ratios measured as a function of mT-m0. While the ratio for kaons shows no significant mT dependence, the π-/π+ ratio is enhanced at small mT-m0 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 π-/π+ 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.
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Geurts, F J M, Kamermans, R, Peitzmann, T & van der Pijll, E C 2006, 'Pion freeze-out time in Pb+Pb collisions at 158AGeV/c studied via π-/π+ and K-/K+ ratios', European Physical Journal C, vol. 48, no. 2, pp. 343-352.