Measurement of non-prompt D0-meson elliptic flow in Pb-Pb collisions at √sNN=5.02 TeV

作者：Acharya, S.; Adamova, D.; Aglieri Rinella, G.; Agnello, M.; Agrawal, N.; Ahammed, Z.; Ahmad, S.; Ahn, S. U.; Ahuja, I.; Akindinov, A.; Al-Turany, M.; Aleksandrov, D.; Alessandro, B.; Alfanda, H. M.; Molina, R. Alfaro; Ali, B.; Alici, A.; Alizadehvandchali, N.; Alkin, A.; Alme, J.; Alocco, G.; Alt, T.; Altamura, A. R.; Altsybeev, I.; Anaam, M. N.; Andrei, C.; Andreou, N.; Andronic, A.; Anguelov, V.; Antinori, F.; Antonioli, P.; Apadula, N.; Aphecetche, L.; Appelshaeuser, H.; Arata, C.

来源：European Physical Journal C, 2023, 83(12): 1123.

DOI：10.1140/epjc/s10052-023-12259-3

• FLAVOR HADRON DECAYS
• QUARK-GLUON PLASMA
• HEAVY-FLAVOR
• COALESCENCE
• PERSPECTIVE
• SUPPRESSION
• ANISOTROPY
• RAPIDITY
• MESONS
• MATTER

The elliptic flow (v(2)) of D-0 mesons from beauty-hadron decays (non-prompt D-0) was measured in midcentral (30-50%) Pb-Pb collisions at a centre-of-mass energy per nucleon pair root sNN=5.02 TeV with the ALICE detector at the LHC. The D0 mesons were reconstructed at midrapidity (|y|<0.8) from their hadronic decay D-0 -> K-pi(+), in the transverse momentum interval 2<p(T)<12 GeV/c. The result indicates a positive v2 for non-prompt D0 mesons with a significance of 2.7 sigma. The non-prompt D0-meson v(2) is lower than that of prompt non-strange D mesons with 3.2 sigma significance in 2<p(T)<8GeV/c, and compatible with the v(2) of beauty-decay electrons. Theoretical calculations of beauty-quark transport in a hydrodynamically expanding medium describe the measurement within uncertainties.