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Measurement of flow harmonics correlations with mean transverse momentum in lead–lead and proton–lead collisions at sNN=5.02TeV with the ATLAS detector

CollaborationWith : Adorni Braccesi Chiassi, Sofia / Akilli, Ece / Amrouche, Cherifa Sabrina / Benoit, Mathieu / Clark, Allan Geoffrey / Della Volpe, Domenico / Di Bello, Francesco Armando / Dubreuil, Arnaud / Ferrere, Didier / Gadatsch, Stefan / Golling, Tobias / Gonzalez Sevilla, Sergio / Iacobucci, Giuseppe / Iizawa, Tomoya / Jansky, Roland / Khoo, Teng Jian / Kiehn, Moritz / Lanfermann, Marie Christine / Lionti, Anthony Eric / Mermod, Philippe / Nindhito, Herjuno Rah / Paolozzi, Lorenzo / Poggi, Riccardo / Raine, Johnny / Salamani, Dalila / Schramm, Steven / Sfyrla, Anna / Sultan, D M S / Valente, Marco / Vicente Barreto Pinto, Mateus / Wu, Xin / Zaffaroni, Ettore
Published in The European Physical Journal. C, Particles and Fields. 2019, vol. 79, p. 1-29
Collection Open Access - SCOAP3
Abstract To assess the properties of the quark–gluon plasma formed in ultrarelativistic ion collisions, the ATLAS experiment at the LHC measures a correlation between the mean transverse momentum and the flow harmonics. The analysis uses data samples of lead–lead and proton–lead collisions obtained at the centre-of-mass energy per nucleon pair of 5.02 TeV, corresponding to total integrated luminosities of 22nb-1 , respectively. The measurement is performed using a modified Pearson correlation coefficient with the charged-particle tracks on an event-by-event basis. The modified Pearson correlation coefficients for the 2nd-, 3rd-, and 4th-order flow harmonics are measured in the lead–lead collisions as a function of event centrality quantified as the number of charged particles or the number of nucleons participating in the collision. The measurements are performed for several intervals of the charged-particle transverse momentum. The correlation coefficients for all studied harmonics exhibit a strong centrality evolution, which only weakly depends on the charged-particle momentum range. In the proton–lead collisions, the modified Pearson correlation coefficient measured for the 2nd-order flow harmonics shows only weak centrality dependence. The lead-lead data is qualitatively described by the predictions based on the hydrodynamical model.
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arXiv: 1907.05176
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ATLAS COLLABORATION. Measurement of flow harmonics correlations with mean transverse momentum in lead–lead and proton–lead collisions at sNN=5.02TeV with the ATLAS detector. In: The European Physical Journal. C, Particles and Fields, 2019, vol. 79, p. 1-29. doi: 10.1140/epjc/s10052-019-7489-6 https://archive-ouverte.unige.ch/unige:131177

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Deposited on : 2020-02-20

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