Elliptic flow of identified hadrons in Pb-Pb collisions at √sNN = 2.76 TeV

Abelev, B. and Antičić, Tome and Gotovac, Siniša and Mudnić, Eugen and Planinić, Mirko and Poljak, Nikola and Simatović, Goran and Šuša, Tatjana and Vicković, Linda and Zyzak, M. (ALICE Collaboration) (2015) Elliptic flow of identified hadrons in Pb-Pb collisions at √sNN = 2.76 TeV. Journal of High Energy Physics, 2015 (6). pp. 190-41. ISSN 1029-8479

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Abstract

The elliptic flow coefficient (v2) of identified particles in Pb-Pb collisions at √ sNN = 2.76 TeV was measured with the ALICE detector at the Large Hadron Collider (LHC). The results were obtained with the Scalar Product method, a two-particle correlation technique, using a pseudo-rapidity gap of |∆η| > 0.9 between the identified hadron under study and the reference particles. The v2 is reported for π ±, K±, K0 S , p+p, φ, Λ+Λ, Ξ −+Ξ + and Ω−+Ω + in several collision centralities. In the low transverse momentum (pT) region, pT < 3 GeV/c, v2(pT) exhibits a particle mass dependence consistent with elliptic flow accompanied by the transverse radial expansion of the system with a common velocity field. The experimental data for π ± and the combined K± and K0 S results, are described fairly well by hydrodynamic calculations coupled to a hadronic cascade model (VISHNU) for central collisions. However, the same calculations fail to reproduce the v2(pT) for p+p, φ, Λ+ Λ and Ξ−+Ξ + . For transverse momentum values larger than about 3 GeV/c, particles tend to group according to their type, i.e. mesons and baryons. The present measurements exhibit deviations from the number of constituent quark (NCQ) scaling at the level of ±20% for pT > 3 GeV/c.

Item Type: Article
Keywords: collective flow, heavy ions, particle correlations and fluctuations
Date: 2015
Subjects: NATURAL SCIENCES > Physics
Additional Information: Open Access. © Copyright CERN, for the benefit of the ALICE Collaboration. Article funded by SCOAP3. Received: May 27, 2014. Revised: April 1, 2015. Accepted: May 16, 2015. Published: June 29, 2015.
Divisions: Faculty of Science > Department of Physics
Publisher: Springer
Depositing User: Nikola Poljak
Date Deposited: 29 May 2016 16:45
Last Modified: 29 May 2016 16:45
URI: http://digre.pmf.unizg.hr/id/eprint/4865

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