In high-multiplicity pp collisions at 13 TeV, muons from charm hadron decays exhibit a nonzero elliptic flow coefficient v2, while muons from bottom hadron decays are consistent with zero v2.
Does the Charm Flow at RHIC?
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abstract
Recent PHENIX Au+Au -> e- + X data from open charm decay are shown to be consistent with two extreme opposite dynamical scenarios of ultra-relativistic nuclear reactions. Perturbative QCD without final state interactions was previously shown to be consistent with the data. However, we show that the data are also consistent with zero mean free path hydrodynamics characterized by a common transverse flow velocity field. The surprising coincidence of both D and B hydrodynamic flow spectra with pQCD up to p_T ~ 3 and 5 GeV, respectively, suggests that heavy quarks may be produced essentially at rest in the rapidly expanding gluon plasma. Possible implications and further tests of collective heavy quark dynamics are discussed.
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Measurement of azimuthal anisotropy of muons from charm and bottom hadrons in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
In high-multiplicity pp collisions at 13 TeV, muons from charm hadron decays exhibit a nonzero elliptic flow coefficient v2, while muons from bottom hadron decays are consistent with zero v2.