Observation of the decay Λb0 → χc1

Research output: Contribution to journalArticlepeer-review

Authors

  • LHCb Collaboration

Colleges, School and Institutes

External organisations

  • Nikhef National Institute for Subatomic Physics
  • University of Zurich
  • University of Liverpool
  • Universidad de Santiago de Compostela
  • University of Bristol
  • Université Clermont Auvergne
  • University of Michigan
  • Istituto Nazionale di Fisica Nucleare, Sezione di Milano
  • University of Cincinnati
  • Technische Universität Dortmund
  • CERN
  • University of Glasgow
  • Universitat Autonoma de Barcelona
  • University of Manchester
  • Petersburg Nuclear Physics Institute (PNPI)
  • University of Cambridge
  • Universidade Federal Do Rio de Janeiro
  • Université Paris-Saclay
  • Sezione INFN di Firenze
  • Sezione INFN di Ferrara
  • Ruprecht-Karls-Universität Heidelberg
  • Institute for High Energy Physics (IHEP)
  • Syracuse University
  • Yandex School of Data Analysis
  • IN2P3
  • Ecole Polytechnique Federale de Lausanne
  • University of Warwick
  • Sezione di Perugia
  • University of Ferrara
  • Chinese Academy of Sciences
  • Sezione di Genova

Abstract

The Cabibbo-suppressed decay Λb0→ χc1 is observed for the first time using data from proton-proton collisions corresponding to an integrated luminosity of 6 fb−1, collected with the LHCb detector at a centre-of-mass energy of 13 TeV. Evidence for the Λb0→ χc2 decay is also found. Using the Λb0→ χc1pK decay as normalisation channel, the ratios of branching fractions are measured to be

B(Λb0→χc1)/B(Λb0→χc1pK) = (6.59±1.01±0.22)×10−2,
B(Λb0→χc2)/B(Λb0→χc1) = 0.95±0.30±0.04±0.04,
B(Λb0→χc2pK)/B(Λb0→χc1pK) = 1.06±0.05±0.04±0.04,

where the first uncertainty is statistical, the second is systematic and the third is due to the uncertainties in the branching fractions of χc1,2→ J/ψγ decays. [Figure not available: see fulltext.]

Bibliographic note

Publisher Copyright: © 2021, The Author(s).

Details

Original languageEnglish
Article number95
Number of pages21
JournalJournal of High Energy Physics
Volume2021
Issue number5
Publication statusPublished - 12 May 2021

Keywords

  • B physics, Branching fraction, Hadron-Hadron scattering (experiments), QCD, Quarkonium

ASJC Scopus subject areas