Chemical freeze-out of strange particles and possible root of strangeness suppression
Two approaches to treat the chemical freeze-out of strange particles in the hadron resonance gas model are analyzed. The first one employs their non-equillibration via the usual γs factor and such a model describes the hadron multiplicities measured in nucleus-nucleus collisions at AGS, SPS and RHIC...
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| Veröffentlicht in: | Europhysics letters 2013-10, Vol.104 (2), p.1-1 |
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| container_title | Europhysics letters |
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| creator | Bugaev, K A Oliinychenko, D R Cleymans, J Ivanytskyi, A I Mishustin, I N Nikonov, E G Sagun, V V |
| description | Two approaches to treat the chemical freeze-out of strange particles in the hadron resonance gas model are analyzed. The first one employs their non-equillibration via the usual γs factor and such a model describes the hadron multiplicities measured in nucleus-nucleus collisions at AGS, SPS and RHIC energies with X2/dof [asymptotically =] 1.15. Surprisingly, at low energies we find not the strangeness suppression, but its enhancement. Also we suggest an alternative approach to treat the strange particle freeze-out separately, but with the full chemical equilibration. This approach is based on the conservation laws which allow us to connect the freeze-outs of strange and non-strange hadrons. Within the suggested approach the same set of hadron multiplicities can be described better than within the conventional approach with X2/dof [asymptotically =] 1.06. |
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The first one employs their non-equillibration via the usual γs factor and such a model describes the hadron multiplicities measured in nucleus-nucleus collisions at AGS, SPS and RHIC energies with X2/dof [asymptotically =] 1.15. Surprisingly, at low energies we find not the strangeness suppression, but its enhancement. Also we suggest an alternative approach to treat the strange particle freeze-out separately, but with the full chemical equilibration. This approach is based on the conservation laws which allow us to connect the freeze-outs of strange and non-strange hadrons. 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| ispartof | Europhysics letters, 2013-10, Vol.104 (2), p.1-1 |
| issn | 0295-5075 1286-4854 |
| language | eng |
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| source | IOP Publishing Journals |
| subjects | Balancing Collisions Conservation laws Hadrons Mathematical models Roots Spark plasma sintering Strangeness |
| title | Chemical freeze-out of strange particles and possible root of strangeness suppression |
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