The production rate of Bs0 mesons relative to B0 mesons is measured by the LHCb experiment in pp collisions at a center-of-mass energy √s=13 TeV over the forward rapidity interval 2<4.5 as a function of the charged particle multiplicity measured in the event. Evidence at the 3.4 σ level is found for an increase of the ratio of Bs0 to B0 cross sections with multiplicity at transverse momenta below 6 GeV/c, with no significant multiplicity dependence at higher transverse momentum. Comparison with data from e+e− collisions implies that the density of the hadronic medium may affect the production rates of B mesons. This is qualitatively consistent with the emergence of quark coalescence as an additional hadronization mechanism in high-multiplicity collisions.
Evidence for Modification of b Quark Hadronization in High-Multiplicity pp Collisions at s =13 TeV
Calabrese, R.;Capriotti, L.;Cavallini, V.;Couturier, B.;Fiorini, M.;Franzoso, E.;Guarise, M.;Kotriakhova, S.;Luppi, E.;Okamura, S.;Pappalardo, L. L.;Passalacqua, B.;Tomassetti, L.;
2023
Abstract
The production rate of Bs0 mesons relative to B0 mesons is measured by the LHCb experiment in pp collisions at a center-of-mass energy √s=13 TeV over the forward rapidity interval 2<4.5 as a function of the charged particle multiplicity measured in the event. Evidence at the 3.4 σ level is found for an increase of the ratio of Bs0 to B0 cross sections with multiplicity at transverse momenta below 6 GeV/c, with no significant multiplicity dependence at higher transverse momentum. Comparison with data from e+e− collisions implies that the density of the hadronic medium may affect the production rates of B mesons. This is qualitatively consistent with the emergence of quark coalescence as an additional hadronization mechanism in high-multiplicity collisions.File | Dimensione | Formato | |
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PhysRevLett.131.061901.pdf
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