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

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 corre- lation 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±, K0S, p+p, φ, Λ+Λ, Ξ−+Ξ+ and Ω−+Ω+ in several collision centralities. In the low transverse momentum (pT) region, pT < 3GeV/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 K0S 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 3GeV/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.

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Eser Adı
(dc.title)
Elliptic flow of identified hadrons in Pb-Pb collisions at 2.76 TeV
Yayın Türü
(dc.type)
Makale
Yazar/lar
(dc.contributor.author)
KARASU UYSAL, Ayben
Yazar/lar
(dc.contributor.author)
ALICE Collaboration
DOI Numarası
(dc.identifier.doi)
10.1007/JHEP06(2015)190
Atıf Dizini
(dc.source.database)
Wos
Atıf Dizini
(dc.source.database)
Scopus
Konu Başlıkları
(dc.subject)
Collective Flow
Konu Başlıkları
(dc.subject)
Particle Correlations and Fluctuations
Konu Başlıkları
(dc.subject)
Heavy Lons
Yayın Tarihi
(dc.date.issued)
2015
Kayıt Giriş Tarihi
(dc.date.accessioned)
2019-07-05T11:32:25Z
Açık Erişim tarihi
(dc.date.available)
2019-07-05T11:32:25Z
Orcid
(dc.identifier.orcid)
0000-0001-6297-2532
Özet
(dc.description.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 corre- lation 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±, K0S, p+p, φ, Λ+Λ, Ξ−+Ξ+ and Ω−+Ω+ in several collision centralities. In the low transverse momentum (pT) region, pT < 3GeV/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 K0S 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 3GeV/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.
Tek Biçim Adres
(dc.identifier.uri)
https://hdl.handle.net/20.500.12498/515
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