Higher harmonic flow coefficients of identified hadrons in Pb-Pb collisions at root sNN=2.76 TeV

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F16%3A00305004" target="_blank" >RIV/68407700:21340/16:00305004 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1007/JHEP09(2016)164" target="_blank" >http://dx.doi.org/10.1007/JHEP09(2016)164</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/JHEP09(2016)164" target="_blank" >10.1007/JHEP09(2016)164</a>

Result language

angličtina

Original language name

Higher harmonic flow coefficients of identified hadrons in Pb-Pb collisions at root sNN=2.76 TeV

Original language description

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 (p<inf>T</inf>) values below ~ 3 GeV/c. In the intermediate p<inf>T</inf> region (3 &lt; p<inf>T</inf>&lt; 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 p<inf>T</inf>&lt; 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 p<inf>T</inf> and of coalescence as a particle production mechanism for the particle type grouping at intermediate values of p<inf>T</inf> for all harmonics.[Figure not available: see fulltext.]

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BG - Nuclear, atomic and molecular physics, accelerators

OECD FORD branch

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Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of High Energy Physics

ISSN

1126-6708

e-ISSN

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Volume of the periodical

2016

Issue of the periodical within the volume

9

Country of publishing house

GB - UNITED KINGDOM

Number of pages

41

Pages from-to

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UT code for WoS article

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EID of the result in the Scopus database

2-s2.0-84990210134