Effects of ρ -meson width on pion distributions in heavy-ion collisions

Huovinen, Pasi (Institute of Theoretical Physics, University of Wroclaw, Wrocław, PL-50204, Poland) ; Lo, Pok Man (Institute of Theoretical Physics, University of Wroclaw, Wrocław, PL-50204, Poland) (Extreme Matter Institute EMMI, GSI, Darmstadt, D-64291, Germany) ; Marczenko, Michał (Institute of Theoretical Physics, University of Wroclaw, Wrocław, PL-50204, Poland) ; Morita, Kenji (Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto, 606-8502, Japan) (Institute of Theoretical Physics, University of Wroclaw, Wrocław, PL-50204, Poland) ; Redlich, Krzysztof (Institute of Theoretical Physics, University of Wroclaw, Wrocław, PL-50204, Poland) (Extreme Matter Institute EMMI, GSI, Darmstadt, D-64291, Germany) ; Sasaki, Chihiro (Institute of Theoretical Physics, University of Wroclaw, Wrocław, PL-50204, Poland)

30 March 2017

Abstract: The influence of the finite width of ρ meson on the pion momentum distribution is studied quantitatively in the framework of the S-matrix approach combined with a blast-wave model to describe particle emissions from an expanding fireball. We find that the proper treatment of resonances which accounts for their production dynamics encoded in data for partial wave scattering amplitudes can substantially modify spectra of daughter particles originating in their two body decays. In particular, it results in an enhancement of the low- pT pions from the decays of ρ mesons which improves the quantitative description of the pion spectra in heavy ion collisions obtained by the ALICE collaboration at the LHC energy.


Published in: Physics letters B (2017)
Published by: Elsevier
DOI: 10.1016/j.physletb.2017.03.060
License: CC-BY-3.0



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