Measurement of fs /fu variation with proton-proton collision energy and B -meson kinematics

Research output: Contribution to journalArticlepeer-review

Authors

  • LHCb Collaboration

Colleges, School and Institutes

External organisations

  • Nikhef National Institute for Subatomic Physics
  • University of Zurich
  • Universidad de Santiago de Compostela
  • University of Bristol
  • University of Michigan
  • Université Clermont Auvergne
  • University of Cincinnati
  • Laboratori Nazionali dell'Infn di Frascati
  • TU Dortmund University, Germany
  • CERN
  • University of Glasgow
  • Universitat Autonoma de Barcelona
  • Petersburg Nuclear Physics Institute (PNPI)
  • Imperial College London
  • Universidade Federal Do Rio de Janeiro
  • IN2P3
  • Sezione INFN di Firenze
  • Sezione INFN di Ferrara
  • University of Maryland
  • Institute for High Energy Physics (IHEP)
  • Yandex School of Data Analysis
  • INFN Sezione di Cagliari
  • Ruprecht-Karls-Universität Heidelberg
  • University of Warwick
  • Institute of Physics

Abstract

The ratio of the Bs0 and B+ fragmentation fractions fs and fu is studied with Bs0→J/ψφ and B+→J/ψK+ decays using data collected by the LHCb experiment in proton-proton collisions at 7, 8, and 13 TeV center-of-mass energies. The analysis is performed in bins of B-meson momentum, longitudinal momentum, transverse momentum, pseudorapidity, and rapidity. The fragmentation-fraction ratio fs/fu is observed to depend on the B-meson transverse momentum with a significance of 6.0σ. This dependency is driven by the 13 TeV sample (8.7σ), while the results for the other collision energies are not significant when considered separately. Furthermore, the results show a 4.8σ evidence for an increase of fs/fu as a function of collision energy.

Details

Original languageEnglish
Article number122002
JournalPhysical Review Letters
Volume124
Issue number12
Publication statusPublished - 26 Mar 2020

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