RT Journal Article
T1 Higher harmonic flow coefficients of identified hadrons in Pb-Pb collisions at √sNN=2.76 TeV
A1 ALICE Collaboration, 
A1 González Ferreiro, Elena
K1 Hadron-Hadron scattering (experiments)
AB The elliptic, triangular, quadrangular and pentagonal anisotropic ow coe -cients for   , K  and p+p in Pb-Pb collisions atp√sNN = 2:76TeV were measured with theALICE detector at the Large Hadron Collider. The results were obtained with the ScalarProduct method, correlating the identi ed hadrons with reference particles from a di erentpseudorapidity region. E ects not related to the common event symmetry planes (non-ow)were estimated using correlations in pp collisions and were subtracted from the measurement.The obtained ow coe cients exhibit a clear mass ordering for transverse momentum(pT) values below   3 GeV/c. In the intermediate pT region (3 < pT < 6 GeV/c),particles group at an approximate level according to the number of constituent quarks,suggesting that coalescence might be the relevant particle production mechanism in thisregion. The results for pT < 3 GeV/c are described fairly well by a hydrodynamical model(iEBE-VISHNU) that uses initial conditions generated by A Multi-Phase Transport model(AMPT) and describes the expansion of the  reball using a value of 0.08 for the ratio ofshear viscosity to entropy density ( =s), coupled to a hadronic cascade model (UrQMD).Finally, expectations from AMPT alone fail to quantitatively describe the measurementsfor all harmonics throughout the measured transverse momentum region. However, thecomparison to the AMPT model highlights the importance of the late hadronic rescatteringstage to the development of the observed mass ordering at low values of pT and ofcoalescence as a particle production mechanism for the particle type grouping at intermediatevalues of pT for all harmonics.
PB Springer
SN 1029-8479
YR 2016
FD 2016
LK http://hdl.handle.net/10347/22149
UL http://hdl.handle.net/10347/22149
LA eng
NO Adam, J., Adamová, D., Aggarwal, M.M. et al. Higher harmonic flow coefficients of identified hadrons in Pb-Pb collisions at √sNN=2.76 TeV. J. High Energ. Phys. 2016, 164 (2016). https://doi.org/10.1007/JHEP09(2016)164
DS Minerva
RD 24 abr 2026