The production rate of Λb0 baryons relative to B0 mesons in pp collisions at a center-of-mass energy s=13 TeV is measured by the LHCb experiment. The ratio of Λb0 to B0 production cross sections shows a significant dependence on both the transverse momentum and the measured charged-particle multiplicity. At low multiplicity, the ratio measured at LHCb is consistent with the value measured in e+e- collisions, and increases by a factor of ∼2 with increasing multiplicity. At relatively low transverse momentum, the ratio of Λb0 to B0 cross sections is higher than what is measured in e+e- collisions, but converges with the e+e- ratio as the momentum increases. These results imply that the evolution of heavy b quarks into final-state hadrons is influenced by the density of the hadronic environment produced in the collision. Comparisons with several models and implications for the mechanisms enforcing quark confinement are discussed.

Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., et al. (2024). Enhanced Production of Λb0 Baryons in High-Multiplicity pp Collisions at √s = 13 TeV. PHYSICAL REVIEW LETTERS, 132(8) [10.1103/physrevlett.132.081901].

Enhanced Production of Λb0 Baryons in High-Multiplicity pp Collisions at √s = 13 TeV

Borsato, M.;Calvi, M.;Capelli, S.;Carniti, P.;Fazzini, D.;García Pardiñas, J.;Gotti, C.;Kirsebom, V.  S.;Martinazzoli, L.;Martinelli, M.;Minotti, A.;Pizzichemi, M.;Salomoni, M.;Shields, E.  B.;
2024

Abstract

The production rate of Λb0 baryons relative to B0 mesons in pp collisions at a center-of-mass energy s=13 TeV is measured by the LHCb experiment. The ratio of Λb0 to B0 production cross sections shows a significant dependence on both the transverse momentum and the measured charged-particle multiplicity. At low multiplicity, the ratio measured at LHCb is consistent with the value measured in e+e- collisions, and increases by a factor of ∼2 with increasing multiplicity. At relatively low transverse momentum, the ratio of Λb0 to B0 cross sections is higher than what is measured in e+e- collisions, but converges with the e+e- ratio as the momentum increases. These results imply that the evolution of heavy b quarks into final-state hadrons is influenced by the density of the hadronic environment produced in the collision. Comparisons with several models and implications for the mechanisms enforcing quark confinement are discussed.
Articolo in rivista - Articolo scientifico
A-center; Center-of-mass energies; Centre-of-mass energies; Charged particle multiplicities; Final state; Hadronics; High multiplicity; Production cross section; Production rates; Transverse momenta
English
2024
132
8
081901
none
Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., et al. (2024). Enhanced Production of Λb0 Baryons in High-Multiplicity pp Collisions at √s = 13 TeV. PHYSICAL REVIEW LETTERS, 132(8) [10.1103/physrevlett.132.081901].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/469023
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