The v^1/3_3/v^1/2_2 ratio in PbAu collisions at √(s_NN) = 17.3 GeV
arxiv(2024)
摘要
The Fourier harmonics, v_2 and v_3 of negative pions are measured at
center-of-mass energy per nucleon pair of √(s_NN)= 17.3 GeV
around midrapidity by the CERES/NA45 experiment at the CERN SPS in 0–30
central PbAu collisions with a mean centrality of 5.5
performed in two centrality bins as a function of the transverse momentum
p_T from 0.05 GeV/c to more than 2 GeV/c. This is the
first measurement of the v^1/3_3/v^1/2_2 ratio as a function of
transverse momentum at SPS energies. For p_T above 0.5
GeV/c, the ratio is nearly flat in accordance with the hydrodynamic
prediction and as previously observed by the ATLAS and ALICE experiments at the
much higher LHC energies. The results are also compared with the SMASH-vHLLE
hybrid model predictions.
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