Observation of a Λb0 − Λ¯b0 production asymmetry in proton-proton collisions at √s = 7 and 8 TeV

Observation of a Λb0 − Λ¯b0 production asymmetry in proton-proton collisions at √s = 7 and 8 TeV

Détails bibliographiques
Parent link:Journal of High Energy Physics
Vol. 2021, iss. 10.— 2021.— [60, 36 p.]
Autres auteurs: Aaij R. Roel, Abdelmotteleb A. S., Eydelman S. I. Semen Isaakovich, Kharisova A. E. Anastasiya Evgenjevna, Panshin G. L. Gennady Leonidovich
Résumé:Title screen
This article presents differential measurements of the asymmetry between Λb0 and Λ¯b0 baryon production rates in proton-proton collisions at centre-of-mass energies of √s = 7 and 8 TeV collected with the LHCb experiment, corresponding to an integrated luminosity of 3 fb−1. The Λb0 baryons are reconstructed through the inclusive semileptonic decay Λb0 → Λc+μ−ν¯¯μX. The production asymmetry is measured both in intervals of rapidity in the range 2.15 < y < 4.10 and transverse momentum in 2 < pT < 27 GeV/c. The results are found to be incompatible with symmetric production with a significance of 5.8 standard deviations for both √s = 7 and 8 TeV data, assuming no CP violation in the decay. There is evidence for a trend as a function of rapidity with a significance of 4 standard deviations. Comparisons to predictions from hadronisation models in PYTHIA and heavy-quark recombination are provided. This result constitutes the first observation of a particle-antiparticle asymmetry in b-hadron production at LHC energies.
Langue:anglais
Publié: 2021
Sujets:
электронный ресурс
труды учёных ТПУ
B physics
Heavy quark production
Hadron-Hadron scattering (experiments)
proton-proton scattering
Hard scattering
Accès en ligne:http://earchive.tpu.ru/handle/11683/72495
https://doi.org/10.1007/JHEP10(2021)060
Format: Électronique Chapitre de livre
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=666698

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