The elliptic flow coefficient (v2) of identified particles in Pb-Pb collisions at sqrt(s_NN)= 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 |Δη| > 0.9 between the identified hadron under study and the reference particles. The v2 is reported for pi+-, K+-, K0_S, p+pbar, Phi, Lambda+antiLambda, Xsi- + antiXsi+ and Omega- + antiOmega+ 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+pbar, Phi, Lambda+antiLambda and Xsi- + antiXsi+. 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.

Abelev, B., Adam, J., Adamová, D., Aggarwal, M.M., Agnello, M., Agostinelli, A., et al. (2015). Elliptic flow of identified hadrons in Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2015(6), 1-41 [10.1007/JHEP06(2015)190].

Elliptic flow of identified hadrons in Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV

Alici, A.;ARCELLI, SILVIA;BASILE, MAURIZIO;BELLINI, FRANCESCA;CIFARELLI, LUISA;COLOCCI, MANUEL;GUERZONI, BARBARA;SCIOLI, GILDA;
2015

Abstract

The elliptic flow coefficient (v2) of identified particles in Pb-Pb collisions at sqrt(s_NN)= 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 |Δη| > 0.9 between the identified hadron under study and the reference particles. The v2 is reported for pi+-, K+-, K0_S, p+pbar, Phi, Lambda+antiLambda, Xsi- + antiXsi+ and Omega- + antiOmega+ 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+pbar, Phi, Lambda+antiLambda and Xsi- + antiXsi+. 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.
2015
Abelev, B., Adam, J., Adamová, D., Aggarwal, M.M., Agnello, M., Agostinelli, A., et al. (2015). Elliptic flow of identified hadrons in Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2015(6), 1-41 [10.1007/JHEP06(2015)190].
Abelev, B.; Adam, J.; Adamová, D.; Aggarwal, M.M.; Agnello, M.; Agostinelli, A.; Agrawal, N.; Ahammed, Z.; Ahmad, N.; Ahmed, I.; Ahn, S.U.; Ahn, S.A.;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/542014
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