Elliptic flow of identified hadrons in Pb-Pb collisions at root(NN)-N-s=2.76 Tev
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and Zyzak, M. and ALICE Collaboration... Show more Show less
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Abstract
The elliptic flow coefficient (v(2)) of identified particles in Pb-Pb
collisions at root 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 |Delta eta| > 0.9 between the identified hadron
under study and the reference particles. The v (2) is reported for
pi(+/-), K-+/-, K-S(0), p+(p) over bar, phi, Lambda+(Lambda) over bar,
Xi+(Xi) over bar (+) and Omega(-)+(Omega) over bar (+) in several
collision centralities. In the low transverse momentum (p(T)) region,
p(T) < 3 GeV/c, v(2)(p(T)) 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 pi (+/-) and the combined K-+/- and K-S(0) 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(2)(p(T)) for p+(p) over bar, phi,
Lambda+(Lambda) over bar, Xi+(Xi) over bar (+). 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 p(T) > 3 GeV/c.... Show more Show less