engleski

Azimuthal Anisotropy of Heavy-Flavor Decay Electrons in p-Pb Collisions at √sNN = 5.02 TeV

Angular correlations between heavy-flavor decay electrons and charged particles at midrapidity (|η|<0.8) are measured in p-Pb collisions at sNN=5.02 TeV. The analysis is carried out for the 0%–20% (high) and 60%–100% (low) multiplicity ranges. The jet contribution in the correlation distribution from high- multiplicity events is removed by subtracting the distribution from low-multiplicity events. An azimuthal modulation remains after removing the jet contribution, similar to previous observations in two-particle angular correlation measurements for light-flavor hadrons. A Fourier decomposition of the modulation results in a positive second-order coefficient (v2) for heavy-flavor decay electrons in the transverse momentum interval 1.5<pT<4 GeV/c in high-multiplicity events, with a significance larger than 5σ. The results are compared with those of charged particles at midrapidity and those of inclusive muons at forward rapidity. The v2 measurement of open heavy-flavor particles at midrapidity in small collision systems could provide crucial information to help interpret the anisotropies observed in such systems.

heavy quark: decay ; electron: final state ; colliding beams: (p heavy ion) ; angular correlation: two-particle ; angular distribution: anisotropy ; electron: transverse momentum ; multiplicity: high ; multiplicity: low ; electron: correlation ; angular distribution: (modulation) ; rapidity dependence ; J/psi(3100): (correlation) ; charged particle: correlation ; muon: rapidity ; ALICE ; CMS ; CERN LHC Coll ; 5.02*10**3 GeV

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