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

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Schmelling,  M.       
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Zavertyaev,  M.       
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Citation

LHCb Collaboration, Aaij, R., Abdelmotteleb, A. S. W., Abellan Beteta, C., Abudinén, F., Ackernley, T., et al. (2024). Enhanced Production of Λb0 Baryons in High-Multiplicity pp Collisions at √s = 13 TeV. Physical Review Letters, 132(8): 081901. doi:10.1103/PhysRevLett.132.081901.


Cite as: https://hdl.handle.net/21.11116/0000-000E-72A7-5
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.