Elliptic flow of identified hadrons in Pb-Pb collisions at √sNN = 2.76 TeV
ALICE Collaboration. (2015). Elliptic flow of identified hadrons in Pb-Pb collisions at √sNN = 2.76 TeV. Journal of High Energy Physics, 2015(6), Article 190. https://doi.org/10.1007/JHEP06(2015)190
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2015Copyright
© CERN, for the benefit of the ALICE Collaboration. Funded by SCOAP3 and licensed under CC BY 4.0
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 correlation
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±, K0
S
, p+p, φ, Λ+Λ,
Ξ
−+Ξ
+
and Ω−+Ω
+
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+p, φ, Λ+ Λ and Ξ−+Ξ
+
. 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.
...
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Except where otherwise noted, this item's license is described as © CERN, for the benefit of the ALICE Collaboration. Funded by SCOAP3 and licensed under CC BY 4.0
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