Elliptic flow of electrons from beauty-hadron decays in Pb-Pb collisions at √sNN=5.02 TeV (CROSBI ID 297648)
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Podaci o odgovornosti
Acharya, S. ; ... ; Antičić, Tome ; ... ; Erhardt, Filip ; ... ; Gotovac, Sven ; ... ; Jerčić, Marko ; ... ; Karatović, David ; ... ; Lončar, Petra ; ... ; Mudnić, Eugen ; ... ; Planinić, Mirko ; ... ; Poljak, Nikola ; ... ; Vicković, Linda ; ... ; Zurlo, N.
ALICE Collaboration
engleski
Elliptic flow of electrons from beauty-hadron decays in Pb-Pb collisions at √sNN=5.02 TeV
The elliptic flow of electrons from beauty hadron decays at midrapidity (|y|<0.8) is measured in Pb- Pb collisions at √sNN=5.02 TeV with the ALICE detector at the LHC. The azimuthal distribution of the particles produced in the collisions can be parametrized with a Fourier expansion, in which the second harmonic coefficient represents the elliptic flow, v2. The v2 coefficient of electrons from beauty hadron decays is measured for the first time in the transverse momentum (pT) range 1.3–6 GeV/c in the centrality class 30%–50%. The measurement of electrons from beauty-hadron decays exploits their larger mean proper decay length cτ≈500 μm compared to that of charm hadrons and most of the other background sources. The v2 of electrons from beauty hadron decays at midrapidity is found to be positive with a significance of 3.75 σ. The results provide insights into the degree of thermalization of beauty quarks in the medium. A model assuming full thermalization of beauty quarks is strongly disfavored by the measurement at high pT, but is in agreement with the results at low pT. Transport models including substantial interactions of beauty quarks with an expanding strongly interacting medium describe the measurement within uncertainties.
Elementary Particles and Fields ; hadron: decay ; electron: elliptic flow ; heavy ion: scattering ; decay: length ; bottom: decay ; angular distribution ; transverse momentum ; transport theory ; CERN LHC Coll ; ALICE ; experimental results ; 5020 GeV-cms/nucleon
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Podaci o izdanju
126 (16)
2021.
162001
13
objavljeno
0031-9007
1079-7114
10.1103/physrevlett.126.162001
Povezanost rada
Fizika