Evidence of rescattering effect in Pb–Pb collisions at the LHC through production of $\rm K^{∗}(892)^{0}$ and $\phi$(1020) mesons

S. Acharya , Daniel Dąbrowski , Kamil Deja , R. A. Diaz , Łukasz Graczykowski , Anna Marie Herghelegiu , Monika Jakubowska , Małgorzata Janik , Przemysław Karczmarczyk , A. M. Khan , S. A. Khan , J. Kim , J. S. Kim , J. Kim , J. Kim , J. Kim , Adam Kisiel , M. Kowalski , Jay Lee , X. L. Li , Julian Myrcha , Łukasz Neumann , Janusz Oleniacz , Brian Paul , Jan Pluta , Marta Janczuk-Richter , Przemysław Rokita , Krystian Rosłon , Maksymilian Schmidt , Tomasz Trzciński , Barbara Trzeciak , Ammar Zaman , Hanna Zbroszczyk

Abstract

Measurements of K∗ (892) 0 and φ(1020)resonance production in Pb–Pb and pp collisions at √ sNN = 5.02 TeV with the ALICE detector at the Large Hadron Collider are reported. The resonances are measured at midrapidity (|y| < 0.5) via their hadronic decay channels and the transverse momentum (pT) distributions are obtained for various collision centrality classes up to pT = 20 GeV/c. The pT-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 φ(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 φ(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 ∼ 4–7 fm/c for central collisions. The pT-differential ratios of K∗ (892) 0/K, φ(1020)/K, K∗ (892) 0/π, φ(1020)/π, p/K ∗ (892) 0 and p/φ(1020) are also presented for Pb–Pb and pp collisions at √ sNN = 5.02 TeV. These ratios show that the rescattering effect is predominantly a low-pT phenomenon.
Collective authorALICE Collaboration
Author S. Acharya - [Variable Energy Cyclotron Centre India]
S. Acharya,,
-
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, Daniel Dąbrowski (FP / NPD)
Daniel Dąbrowski,,
- Nuclear Physics Division
, Kamil Deja (FEIT / ICS)
Kamil Deja,,
- The Institute of Computer Science
, R. A. Diaz - [Centro de Aplicaciones Tecnologicas y Desarrollo Nuclear]
R. A. Diaz,,
-
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, Łukasz Graczykowski (FP / NPD)
Łukasz Graczykowski,,
- Nuclear Physics Division
, Anna Marie Herghelegiu - University of Medicine and Pharmacy “Carol Davila" (UMDCD) [Horia Hulubei National Institute of Physics and Nuclear Engineering]
Anna Marie Herghelegiu,,
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-
, Monika Jakubowska (FoEE / ICIE)
Monika Jakubowska,,
- The Institute of Control and Industrial Electronics
, Małgorzata Janik (FP / NPD)
Małgorzata Janik,,
- Nuclear Physics Division
, Przemysław Karczmarczyk (FP / NPD)
Przemysław Karczmarczyk,,
- Nuclear Physics Division
, A. M. Khan - [Huazhong Normal University]
A. M. Khan,,
-
-
et al.`
Total number of authors1008
Journal seriesPhysics Letters B, [Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics], ISSN 0370-2693, e-ISSN 1873-2445
Issue year2020
Vol802
Pages1-14
Publication size in sheets0.65
Article number135225
Keywords in Englishrelativistic heavy ion physics ; quark gluon plasma ; particle and resonance production ; experimental results
ASJC Classification3106 Nuclear and High Energy Physics
DOIDOI:10.1016/j.physletb.2020.135225
URL https://www.sciencedirect.com/science/article/pii/S0370269320300290?via%3Dihub#bfn0060
Languageen angielski
Score (nominal)140
Score sourcejournalList
ScoreMinisterial score = 140.0, 22-09-2020, ArticleFromJournal
Publication indicators WoS Citations = 0; Scopus Citations = 1; Scopus SNIP (Source Normalised Impact per Paper): 2017 = 1.548; WoS Impact Factor: 2018 = 4.162 (2) - 2018=3.627 (5)
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