Inhaltszusammenfassung

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 parameterized with a Fourier expansion, in which the second harmonic coefficient represents the elliptic flow, 𝑣2. The 𝑣2 coefficient is measured for the first time in transverse momentum (𝑝T) range 1.3-6 GeV/𝑐 in the centrality class 30-50%. The m...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 parameterized with a Fourier expansion, in which the second harmonic coefficient represents the elliptic flow, 𝑣2. The 𝑣2 coefficient is measured for the first time in 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 3.75𝜎. The results provide insights on the degree of thermalization of beauty quarks in the medium. A model assuming full thermalization of beauty quarks is strongly disfavoured 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. » weiterlesen» einklappen

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DDC Sachgruppe:
Physik