Angular correlations between heavy-flavour decay electrons and charged particles at mid-rapidity (|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 distri- bution 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-flavour hadrons. A Fourier decomposition of the modulation results in a positive second-order coefficient (v2) for heavy-flavour 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 mid- rapidity and of inclusive muons at forward rapidity. The v2 measurement of open heavy-flavour par- ticles at mid-rapidity in small collision systems could provide crucial information to help interpret the anisotropies observed in such systems.
Azimuthal Anisotropy of Heavy-Flavor Decay Electrons in p -Pb Collisions at sNN=5.02 TeV
Barile, F.;Colella, D.;Di Bari, D.;Mazzilli, M.;Volpe, G.;
2019-01-01
Abstract
Angular correlations between heavy-flavour decay electrons and charged particles at mid-rapidity (|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 distri- bution 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-flavour hadrons. A Fourier decomposition of the modulation results in a positive second-order coefficient (v2) for heavy-flavour 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 mid- rapidity and of inclusive muons at forward rapidity. The v2 measurement of open heavy-flavour par- ticles at mid-rapidity in small collision systems could provide crucial information to help interpret the anisotropies observed in such systems.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
