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

Acharya S.
•
Adamova D.
•
Adler A.
altro
Zurlo N.
2020
  • journal article

Periodico
PHYSICS LETTERS. SECTION B
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.
DOI
10.1016/j.physletb.2020.135225
WOS
WOS:000515091400024
Archivio
http://hdl.handle.net/11368/2961787
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85078082421
https://www.sciencedirect.com/science/article/pii/S0370269320300290?via=ihub
Diritti
open access
license:creative commons
license uri:http://creativecommons.org/licenses/by/4.0/
FVG url
https://arts.units.it/bitstream/11368/2961787/1/PLB_802(2020)135225_1-14.pdf
Soggetti
  • Heavy ion interaction...

Web of Science© citazioni
36
Data di acquisizione
Mar 28, 2024
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