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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

  • Author(s): Acharya, S
  • Adamová, D
  • Adler, A
  • Adolfsson, J
  • Aggarwal, MM
  • Aglieri Rinella, G
  • Agnello, M
  • Agrawal, N
  • Ahammed, Z
  • Ahmad, S
  • Ahn, SU
  • Akindinov, A
  • Al-Turany, M
  • Alam, SN
  • Albuquerque, DSD
  • Aleksandrov, D
  • Alessandro, B
  • Alfanda, HM
  • Alfaro Molina, R
  • Ali, B
  • Ali, Y
  • Alici, A
  • Alkin, A
  • Alme, J
  • Alt, T
  • Altenkamper, L
  • Altsybeev, I
  • Anaam, MN
  • Andrei, C
  • Andreou, D
  • Andrews, HA
  • Andronic, A
  • Angeletti, M
  • Anguelov, V
  • Anson, C
  • Antičić, T
  • Antinori, F
  • Antonioli, P
  • Anwar, R
  • Apadula, N
  • Aphecetche, L
  • Appelshäuser, H
  • Arcelli, S
  • Arnaldi, R
  • Arratia, M
  • Arsene, IC
  • Arslandok, M
  • Augustinus, A
  • Averbeck, R
  • Aziz, S
  • Azmi, MD
  • Badalà, A
  • Baek, YW
  • Bagnasco, S
  • Bai, X
  • Bailhache, R
  • Bala, R
  • Baldisseri, A
  • Ball, M
  • Balouza, S
  • Barbera, R
  • Barioglio, L
  • Barnaföldi, GG
  • Barnby, LS
  • Barret, V
  • Bartalini, P
  • Barth, K
  • Bartsch, E
  • Baruffaldi, F
  • Bastid, N
  • Basu, S
  • Batigne, G
  • Batyunya, B
  • Bauri, D
  • Bazo Alba, JL
  • Bearden, IG
  • Bedda, C
  • Behera, NK
  • Belikov, I
  • Bell Hechavarria, ADC
  • Bellini, F
  • Bellwied, R
  • Belyaev, V
  • Bencedi, G
  • Beole, S
  • Bercuci, A
  • Berdnikov, Y
  • Berenyi, D
  • Bertens, RA
  • Berzano, D
  • Besoiu, MG
  • Betev, L
  • Bhasin, A
  • Bhat, IR
  • Bhat, MA
  • Bhatt, H
  • Bhattacharjee, B
  • Bianchi, A
  • Bianchi, L
  • Bianchi, N
  • et al.
Abstract

Measurements of K(892)0⁎ and ϕ(1020) resonance production in Pb–Pb and pp collisions at s = 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 (p ) distributions are obtained for various collision centrality classes up to p = 20 GeV/c. The p -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 p -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 s = 5.02 TeV. These ratios show that the rescattering effect is predominantly a low-p phenomenon. NN T T T T NN T

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