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Enhanced production of Λ0b baryons in high-multiplicity pp collisions at √s=13 TeV

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The production rate of Λ0𝑏 baryons relative to 𝐵0 mesons in 𝑝⁢𝑝 collisions at a center-of-mass energy √𝑠=13 TeV is measured by the LHCb experiment. The ratio of Λ0𝑏 to 𝐵0 production cross sections shows a significant dependence on both the transverse momentum and the measured charged-particle multip...

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Main Authors: Aaij, Roel (Author) , Bachmann, Sebastian (Author) , Carus, Leon (Author) , Caspary, Rowina (Author) , Cocha Toapaxi, Carlos (Author) , De Cian, Michel (Author) , Eckstein, Ellinor (Author) , Frau, Giulia (Author) , Glaser, Fabian (Author) , Grabowski, Jascha (Author) , Günther, Paul André (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Hu, Jiangqiao (Author) , Kubat, Jakub (Author) , Langenbruch, Christoph (Author) , Leverington, Blake (Author) , Marks, Jörg (Author) , Mikhasenko, Mikhail (Author) , Morgenthaler, Maurice Pierre (Author) , Neubert, Sebastian (Author) , Nogga, Piet (Author) , Padeken, Klaas Ole (Author) , Pais, Preema (Author) , Promberger, Laura (Author) , Roy, Shreya (Author) , Ruiz Diaz, Miguel (Author) , Schmelling, Michael (Author) , Skuza, Raphael (Author) , Tuci, Giulia (Author) , Uecker, Lennart Henning (Author) , Unverzagt, Daniel Joachim (Author) , Uwer, Ulrich (Author) , Wang, Chishuai (Author) , Witola, Lukas (Author) , Zavertyaev, Mikhail (Author) , Zhao, Ya (Author) , Zhelezov, Alexey (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 20 February 2024
In: Physical review letters
Year: 2024, Volume: 132, Issue: 8, Pages: 1-12
ISSN:1079-7114
DOI:10.1103/PhysRevLett.132.081901
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevLett.132.081901
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.132.081901
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Author Notes:R. Aaij et al. (LHCb Collaboration)
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Summary:The production rate of Λ0𝑏 baryons relative to 𝐵0 mesons in 𝑝⁢𝑝 collisions at a center-of-mass energy √𝑠=13 TeV is measured by the LHCb experiment. The ratio of Λ0𝑏 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 Λ0𝑏 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.
Item Description:Im Titel ist die Zahl "0" hochgestellt und der Buchstabe "b" in Λ0b ist tiefgestellt
Gesehen am 08.10.2025
The LHCb collaboration: R. Aaij, S. Bachmann, L. Carus, R. Caspary, C.E. Cocha Toapaxi, M. De Cian, E. Eckstein, G. Frau, F. Glaser, j. Grabowski, P.A. Günther, X. Han, S. Hausmann-Menzemer, P. Herrero Gascon, J. Hu, J. Kubat, C. Langenbruch, B. Leverington, J. Marks, M. Mikhasenko, M.P. Morgenthaler, S. Neubert, P. Nogga, K.O. Padeken, P.R. Pais, L. Promberger, S.R. Roy, M. Ruiz Diaz, M. Schmelling, R. Skuza, G. Tuci, L.H. Uecker, D.J. Unverzagt, U. Uwer, C. Wang, L. Witola, M. Zavertyaev, Y. Zhao, A. Zhelezov und weitere 1068
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.132.081901

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