E-viri
PDF
Recenzirano
Odprti dostop
-
Acharya, S.; Ahmad, S.; Akindinov, A.; Altsybeev, I.; Averbeck, R.; Aziz, S.; Bauri, D.; Bercuci, A.; Bianchi, A.; Bielčíková, J.; Biswas, R.; Blair, J.T.; Borel, H.; Broz, M.; Bugnon, O.; Bysiak, S.A.; Chang, W.; Cheshkov, C.; Chujo, T.; Collu, A.; Corrales Morales, Y.; Costa, F.; Cunqueiro, L.; Danisch, M.C.; Das, P.; De Caro, A.; Deloff, A.; Ehlers, R.J.; Festanti, A.; Galvan, C.D.; Garner, K.; Gotovac, S.; Groettvik, O.S.; Gupta, R.; Hannigan, R.; Harris, J.W.; Harton, A.; Hayashi, S.; Herrmann, F.; Hippolyte, B.; Huang, C.; Hughes, C.; Izucheev, V.; Janson, T.; Karavicheva, T.; Kim, J.; Kim, T.; Klein, J.; Králik, I.; Kryshen, E.; Kurashvili, P.; Kurepin, A.B.; Kweon, M.J.; Kwon, J.Y.; Lee, J.; Li, X.; Li, X.L.; Lisa, M.A.; Majka, R.D.; Malaev, M.; Mandaglio, G.; Manzari, V.; Mao, Y.; Massacrier, L.; Masson, E.; Menchaca-Rocha, A.; Miake, Y.; Mihaylov, D.L.; Mrnjavac, T.; Nayak, T.K.; Nikolaev, S.; Pan, J.; Pathak, S.P.; Peng, X.; Pistone, D.; Quishpe, R.E.; Reygers, K.; Rogochaya, E.; Ronchetti, F.; Sahoo, S.; Scapparone, E.; Schmidt, H.R.; Schmidt, M.; Shimomura, M.; Snellman, T.W.; Sputowska, I.; Stocco, D.; Storetvedt, M.M.; Suire, C.; Tripathy, S.; Trubnikov, V.; Vercellin, E.; Villatoro Tello, A.; Vislavicius, V.; Wikne, J.; Yuncu, A.; Zampolli, C.; Zarochentsev, A.; Zichichi, A.; Zimmermann, M.B.
Physics letters. B, 03/2020, Letnik: 802Journal Article
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.
