عنوان

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

شماره

LA7vp9q35r

عنوان اصلي

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

نام عام مواد

[Article]

نام نخستين پديدآور

Acharya, SAdamová, DAdler, AAdolfsson, JAggarwal, MMAglieri Rinella, GAgnello, MAgrawal, NAhammed, ZAhmad, SAhn, SUAkindinov, AAl-Turany, MAlam, SNAlbuquerque, DSDAleksandrov, DAlessandro, BAlfanda, HMAlfaro Molina, RAli, BAli, YAlici, AAlkin, AAlme, JAlt, TAltenkamper, Let al.

متن يادداشت

© 2020 The Author(s) 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.

تاريخ نشر

2020

عنوان

Lawrence Berkeley National Laboratory

نام الکترونيکي

نوع ماده

[Article]

کد کاربرگه

278951

سطح دسترسي

a

تكميل شده

Y