Evidence of rescattering effect in Pb-Pb collisions at the LHC through production of K*(892)(0) and phi(1020) mesons

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The ALICE Collaboration , Acharya , S , Brucken , E J , Hilden , T E , Kim , D J , Krizek , F , Litichevskyi , V , Novitzky , N , Orava , R , Parkkila , J E , Rak , J , Rytkonen , H , Räsänen , S , Saarimäki , O A M , Slupecki , M , Snellman , T W , Trzaska , W H & Zhou , Z 2020 , ' Evidence of rescattering effect in Pb-Pb collisions at the LHC through production of K*(892)(0) and phi(1020) mesons ' , Physics Letters B , vol. 802 , 135225 . https://doi.org/10.1016/j.physletb.2020.135225

Title: Evidence of rescattering effect in Pb-Pb collisions at the LHC through production of K*(892)(0) and phi(1020) mesons
Author: The ALICE collaboration; Acharya, S.; Brucken, E. J.; Hilden, T. E.; Kim, D. J.; Krizek, F.; Litichevskyi, V.; Novitzky, Norbert; Orava, R.; Parkkila, J. E.; Rak, J.; Rytkonen, H.; Räsänen, Sami; Saarimäki, Oskari Antti Matti; Slupecki, M.; Snellman, T. W.; Trzaska, W. H.; Zhou, Z.
Contributor organization: Helsinki Institute of Physics
Date: 2020-03-10
Language: eng
Number of pages: 14
Belongs to series: Physics Letters B
ISSN: 0370-2693
DOI: https://doi.org/10.1016/j.physletb.2020.135225
URI: http://hdl.handle.net/10138/319890
Abstract: Measurements of K*(892)(0) and phi(1020) resonance production in Pb-Pb and pp collisions at root s(NN) = 5.02 TeV with the ALICE detector at the Large Hadron Collider are reported. The resonances are measured at midrapidity (vertical bar y vertical bar <0.5) via their hadronic decay channels and the transverse momentum (p(T)) distributions are obtained for various collision centrality classes up to p(T) = 20 GeV/c. The p(T)-integrated yield ratio K*(892)(0)/K in Pb-Pb collisions shows significant suppression relative to pp collisions and decreases towards more central collisions. In contrast, the phi(1020)/K ratio does not show any suppression. Furthermore, the measured K*(892)(0)/K ratio in central Pb-Pb collisions is significantly suppressed with respect to the expectations based on a thermal model calculation, while the phi(1020)/K ratio agrees with the model prediction. These measurements are an experimental demonstration of rescattering of K*(892)(0) decay products in the hadronic phase of the collisions. The K*(892)(0)/K yield ratios in Pb-Pb and pp collisions are used to estimate the time duration between chemical and kinetic freeze-out, which is found to be similar to 4-7 fm/c for central collisions. The p(T)-differential ratios of K*(892)(0)/K, phi(1020)/K, K*(892)(0)/pi, phi(1020)/pi, p/K*(892)(0) and p/phi(1020) are also presented for Pb-Pb and pp collisions at root s(NN) = 5.02 TeV. These ratios show that the rescattering effect is predominantly a low-p(T) phenomenon. (C) 2020 The Author(s). Published by Elsevier B.V.
Subject: 114 Physical sciences
QUARK-GLUON PLASMA
RESONANCE PRODUCTION
ROOT-S(NN)=200 GEV
FREEZE-OUT
ENERGY
PERSPECTIVE
PHYSICS
MATTER
AU+AU
PIONS
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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