Measurement of longitudinal flow decorrelations in Pb+Pb collisions at √.sup.s./sup.NN =2.76 and 5.02 TeV with the ATLAS detector

0500352 - FZÚ 2019 RIV DE eng J - Článek v odborném periodiku
Aaboud, M. - Aad, G. - Abbott, B. - Chudoba, Jiří - Hejbal, Jiří - Hladík, Ondřej - Jakoubek, Tomáš - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … celkem 2902 autorů
Measurement of longitudinal flow decorrelations in Pb+Pb collisions at √^sNN =2.76 and 5.02 TeV with the ATLAS detector.
European Physical Journal C. Roč. 78, č. 2 (2018), s. 1-37, č. článku 142. ISSN 1434-6044. E-ISSN 1434-6052
Grant CEP: GA MŠMT(CZ) LTT17018
Institucionální podpora: RVO:68378271
Klíčová slova: ATLAS * flow decorrelation * longitudinal dynamics
Obor OECD: Particles and field physics
Impakt faktor: 4.843, rok: 2018

Measurements of longitudinal flow correlations are presented for charged particles in the pseudorapidity range |η|<2.4 using 7 and 470 upmub−1 of Pb+Pb collisions at sNN−−−√=2.76 and 5.02 TeV, respectively, recorded by the ATLAS detector at the LHC. It is found that the correlation between the harmonic flow coefficients vn measured in two separated η intervals does not factorise into the product of single-particle coefficients, and this breaking of factorisation, or flow decorrelation, increases linearly with the η separation between the intervals. The flow decorrelation is stronger at 2.76 TeV than at 5.02 TeV. Higher-order moments of the correlations are also measured, and the corresponding linear coefficients for the kth -moment of the vn are found to be proportional to k for v3 , but not for v2 . The decorrelation effect is separated into contributions from the magnitude of vn and the event-plane orientation, each as a function of η .

Trvalý link: http://hdl.handle.net/11104/0292442