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

Aaij, R. ; Ruiz-Vidal, Joan LU and Zunica, G. (2024) In Physical Review Letters 132(8).
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... (More)
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. © 2024 CERN. (Less)
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Contribution to journal
publication status
published
subject
keywords
Hadrons, Momentum, Tellurium compounds, 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, article, baryon, Charged particles
in
Physical Review Letters
volume
132
issue
8
article number
081901
publisher
American Physical Society
external identifiers
  • scopus:85185840573
  • pmid:38457697
ISSN
1079-7114
DOI
10.1103/PhysRevLett.132.081901
language
English
LU publication?
yes
id
4a81f8be-4e52-4703-a7ba-2f003d05344f
date added to LUP
2024-03-28 16:00:28
date last changed
2024-03-29 03:00:06
@article{4a81f8be-4e52-4703-a7ba-2f003d05344f,
  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. © 2024 CERN.}},
  author       = {{Aaij, R. and Ruiz-Vidal, Joan and Zunica, G.}},
  issn         = {{1079-7114}},
  keywords     = {{Hadrons; Momentum; Tellurium compounds; 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; article; baryon; Charged particles}},
  language     = {{eng}},
  number       = {{8}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Letters}},
  title        = {{Enhanced Production of Λb0 Baryons in High-Multiplicity pp Collisions at s =13 TeV}},
  url          = {{http://dx.doi.org/10.1103/PhysRevLett.132.081901}},
  doi          = {{10.1103/PhysRevLett.132.081901}},
  volume       = {{132}},
  year         = {{2024}},
}