Title
Higher harmonic flow coefficients of identified hadrons in Pb-Pb collisions at √sNN=2.76 TeV
Date Issued
01 September 2016
Access level
open access
Resource Type
journal article
Author(s)
Adam J.
Adamová D.
Aggarwal M.M.
Aglieri Rinella G.
Agnello M.
Agrawal N.
Ahammed Z.
Ahmad S.
Ahn S.U.
Aiola S.
Akindinov A.
Alam S.N.
Albuquerque D.S.D.
Aleksandrov D.
Alessandro B.
Alexandre D.
Alfaro Molina R.
Alici A.
Alkin A.
Alme J.
Alt T.
Altinpinar S.
Altsybeev I.
Alves Garcia Prado C.
An M.
Andrei C.
Andrews H.A.
Andronic A.
Anguelov V.
Antičić T.
Antinori F.
Antonioli P.
Aphecetche L.
Appelshäuser H.
Arcelli S.
Arnaldi R.
Arnold O.W.
Arsene I.C.
Arslandok M.
Audurier B.
Augustinus A.
Averbeck R.
Azmi M.D.
Badalà A.
Baek Y.W.
Bagnasco S.
Bailhache R.
Bala R.
Balasubramanian S.
Baldisseri A.
Baral R.C.
Barbano A.M.
Barbera R.
Barile F.
Barnaföldi G.G.
Barnby L.S.
Barret V.
Bartalini P.
Barth K.
Bartke J.
Bartsch E.
Basile M.
Bastid N.
Basu S.
Bathen B.
Batigne G.
Batista Camejo A.
Batyunya B.
Batzing P.C.
Bearden I.G.
Beck H.
Bedda C.
Behera N.K.
Belikov I.
Bellini F.
Bello Martinez H.
Bellwied R.
Belmont R.
Belmont-Moreno E.
Beltran L.G.E.
Belyaev V.
Bencedi G.
Beole S.
Berceanu I.
Bercuci A.
Berdnikov Y.
Berenyi D.
Bertens R.A.
Berzano D.
Betev L.
Bhasin A.
Bhat I.R.
Bhati A.K.
Bhattacharjee B.
Bhom J.
Bianchi L.
Bianchi N.
Bianchin C.
Bielčík J.
Bielčíková J.
Publisher(s)
Springer Science and Business Media Deutschland GmbH
Abstract
The elliptic, triangular, quadrangular and pentagonal anisotropic flow coefficients for π±, K± and p + p ¯ in Pb-Pb collisions at sNN=2.76 TeV were measured with the ALICE detector at the Large Hadron Collider. The results were obtained with the Scalar Product method, correlating the identified hadrons with reference particles from a different pseudorapidity region. Effects not related to the common event symmetry planes (non-flow) were estimated using correlations in pp collisions and were subtracted from the measurement. The obtained flow coefficients exhibit a clear mass ordering for transverse momentum (pT) values below ≈ 3 GeV/c. In the intermediate pT region (3 < pT< 6 GeV/c), particles group at an approximate level according to the number of constituent quarks, suggesting that coalescence might be the relevant particle production mechanism in this region. The results for pT< 3 GeV/c are described fairly well by a hydrodynamical model (iEBE-VISHNU) that uses initial conditions generated by A Multi-Phase Transport model (AMPT) and describes the expansion of the fireball using a value of 0.08 for the ratio of shear viscosity to entropy density (η/s), coupled to a hadronic cascade model (UrQMD). Finally, expectations from AMPT alone fail to quantitatively describe the measurements for all harmonics throughout the measured transverse momentum region. However, the comparison to the AMPT model highlights the importance of the late hadronic rescattering stage to the development of the observed mass ordering at low values of pT and of coalescence as a particle production mechanism for the particle type grouping at intermediate values of pT for all harmonics.[Figure not available: see fulltext.]
Volume
2016
Issue
9
Language
English
OCDE Knowledge area
Física de partículas, Campos de la Física
Scopus EID
2-s2.0-84990210134
Source
Journal of High Energy Physics
ISSN of the container
11266708
Sponsor(s)
National Science Foundation - 1305280, 1307461, 1407051, 1613118 - NSF Science and Technology Facilities Council - 2014 STFC Nuclear Physics CG, ALICE, GRIDPP, ST/J000108/1, ST/L005670/1, ST/L005751/1, ST/M00158X/1, ST/M001598/1, ST/M001601/1, ST/M00340X/1, ST/N00261X/1 - STFC Japan Society for the Promotion of Science - 15H03664, 25287048, 26610071 - JSPS
Sources of information: Directorio de Producción Científica Scopus