Abstract
Angular correlations between heavy-flavor decay electrons and charged particles at midrapidity () are measured in -Pb collisions at . 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 () for heavy-flavor decay electrons in the transverse momentum interval in high-multiplicity events, with a significance larger than . The results are compared with those of charged particles at midrapidity and those of inclusive muons at forward rapidity. The 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.
- Received 7 June 2018
- Revised 16 October 2018
DOI:https://doi.org/10.1103/PhysRevLett.122.072301
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