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<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<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.
Measurement of non-prompt D0-meson elliptic flow in Pb-Pb collisions at √sNN=5.02 TeV
Alocco, G;Beole, S;Bianchi, Livio;Botta, Elena;Ferretti, Alessandro;Gagliardi, Martino;Masera, Massimo;Mazzaschi, F;Pennisi, Michele;Perciballi, Stefania;Pucillo, Sara;Quaglia, Luca;Riffero, A. G.;Terlizzi, Livia;Trogolo, S;Vercellin, E;
2023-01-01
Abstract
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<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<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.
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