The elliptic flow coefficient (v<inf>2</inf>) of identified particles in Pb-Pb collisions at (Formula presented.) 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 |ÎÎ·| > 0.9 between the identified hadron under study and the reference particles. The v<inf>2</inf> is reported for (Formula presented.) in several collision centralities. In the low transverse momentum (p<inf>T</inf>) region, p<inf>T</inf>< 3 GeV/c, v<inf>2</inf>(p<inf>T</inf>) 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 Ï<sup>Â±</sup> and the combined K<sup>Â±</sup> and K<inf>S</inf> <sup>0</sup> 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 v<inf>2</inf>(p<inf>T</inf>) for (Formula presented.). 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 Â±20% for p<inf>T</inf>> 3 GeV/c.
|Titolo:||Elliptic flow of identified hadrons in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV|
|Data di pubblicazione:||2015|
|Appare nelle tipologie:||1.1.1 Articolo su rivista con DOI|