# Non-thermal $p/\pi$ ratio at LHC as a consequence of hadronic final state interactions

Abstract : Recent LHC data on Pb+Pb reactions at sqrt s_{NN}=2.7 TeV suggests that the p/pi is incompatible with thermal models. We explore several hadron ratios (K/pi, p/pi, Lambda/pi, Xi/pi) within a hydrodynamic model with hadronic after burner, namely UrQMD 3.3, and show that the deviations can be understood as a final state effect. The measured values of the hadron ratios do then allow to gauge the transition energy density from hydrodynamics to the Boltzmann description. We find that the data can be explained with transition energy densities of 840 +- 150 MeV/fm^3.
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http://hal.in2p3.fr/in2p3-00682472
Contributor : Dominique Girod <>
Submitted on : Monday, March 26, 2012 - 10:53:06 AM
Last modification on : Tuesday, November 27, 2018 - 3:08:00 PM

### Citation

J. Steinheimer, Jörg Aichelin, M. Bleicher. Non-thermal $p/\pi$ ratio at LHC as a consequence of hadronic final state interactions. Physical Review Letters, American Physical Society, 2013, 110, pp.042501. ⟨10.1103/PhysRevLett.110.042501⟩. ⟨in2p3-00682472⟩

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