Nonthermal p/π Ratio at LHC as a Consequence of Hadronic Final State Interactions

被引：84

作者：

Steinheimer, Jan ^{[1
,2
]}

Aichelin, Joerg ^{[2
,3
]}

Bleicher, Marcus ^{[2
,4
]}

机构：

[1] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[2] Goethe Univ Frankfurt, Frankfurt Inst Adv Studies, D-60438 Frankfurt, Germany

[3] Univ Nantes, Ecole Mines Nantes, CNRS, SUBATECH,UMR 6457,IN2P3, F-44307 Nantes 3, France

[4] Goethe Univ Frankfurt, Inst Theoret Phys, D-60438 Frankfurt, Germany

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 04期

关键词：

STRANGE PARTICLE-PRODUCTION; HEAVY-ION COLLISIONS; ANTIBARYON-PRODUCTION; FLOW;

D O I：

10.1103/PhysRevLett.110.042501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Recent LHC data on Pb + Pb reactions at root 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 a hadronic after burner, namely the ultrarelativistic quantum molecular dynamics model 3.3, and show that the deviations can be understood as a final state effect. We propose the p/pi as an observable sensitive on whether final state interactions take place or not. The measured values of the hadron ratios do then allow us 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). DOI: 10.1103/PhysRevLett.110.042501

引用

页数：4

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