Evidence of rescattering effect in Pb-Pb collisions at the LHC through production of K*(892)(0) and [phi](1020) mesons
Measurements of K*(892)(0) and phi(1020) resonance production in Pb-Pb and pp collisions at root s(NN) = 5.02 TeV with the ALICE detector at the Large Hadron Collider are reported. The resonances are measured at midrapidity (vertical bar y vertical bar < 0.5) via their hadronic decay channels and...
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
16 January 2020
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| In: |
Physics letters
Year: 2020, Jahrgang: 802 |
| ISSN: | 1873-2445 |
| DOI: | 10.1016/j.physletb.2020.135225 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.physletb.2020.135225
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| Verfasserangaben: | ALICE Collaboration |
MARC
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| 245 | 1 | 0 | |a Evidence of rescattering effect in Pb-Pb collisions at the LHC through production of K*(892)(0) and [phi](1020) mesons |c ALICE Collaboration |
| 246 | 3 | 3 | |a Evidence of rescattering effect in Pb-Pb collisions at the LHC through production of K * (892) (0) and [phi] (1020) mesons |
| 264 | 1 | |c 16 January 2020 | |
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| 500 | |a Im Titel ist die 0 hochgestellt, das phi ist als griechisches Zeichen dargestellt | ||
| 500 | |a ALICE Collaboration: S. Acharya, V. Anguelov, M. Arslandok, M.C. Danisch, V.J.G. Feuillard, P. Glässel, J. Kim, M. Kim, M.K. Köhler, L. Leardini, N.A. Martin, A. Ohlson, Y. Pachmayer, K. Reygers, R. Schicker, A. Schmah, M.O. Schmidt, J. Stachel, D.F. Weiser, B. Windelband, A. Yuncu und 1004 weitere | ||
| 500 | |a Gesehen am 28.04.2020 | ||
| 520 | |a Measurements of K*(892)(0) and phi(1020) resonance production in Pb-Pb and pp collisions at root s(NN) = 5.02 TeV with the ALICE detector at the Large Hadron Collider are reported. The resonances are measured at midrapidity (vertical bar y vertical bar < 0.5) via their hadronic decay channels and the transverse momentum (p(T)) distributions are obtained for various collision centrality classes up to p(T) = 20 GeV/c. The p(T)-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 phi(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 phi(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 similar to 4-7 fm/c for central collisions. The p(T)-differential ratios of K*(892)(0)/K, phi(1020)/K, K*(892)(0)/pi, phi(1020)/pi, p/K*(892)(0) and p/phi(1020) are also presented for Pb-Pb and pp collisions at root s(NN) = 5.02 TeV. These ratios show that the rescattering effect is predominantly a low-p(T) phenomenon. (C) 2020 The Author(s). Published by Elsevier B.V. | ||
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