First Observation of the Radiative Decay Λb0 → Λγ

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, Ann Arbor.
  • LPC
  • University of Cincinnati
  • Laboratori Nazionali dell'Infn di Frascati
  • Technische Universität Dortmund
  • CERN
  • University of Glasgow
  • Universitat de Barcelona
  • Petersburg Nuclear Physics Institute (PNPI)
  • Imperial College London
  • Universidade Federal Do Rio de Janeiro
  • IN2P3
  • Sezione INFN di Firenze
  • Laboratory of Photonics and Interfaces, Department de Chimie, Ecole Polytechnique Federale de Lausanne, CH-1015 Lausanne, Switzerland. ahmad@mpip-mainz.mpg.de
  • Sezione INFN di Ferrara
  • University of Maryland, College Park, Maryland 20742 USA
  • Institute for High Energy Physics (IHEP)
  • Syracuse University
  • Yandex School of Data Analysis
  • INFN Sezione di Cagliari
  • Ruprecht-Karls-Universität Heidelberg
  • The University of Warwick
  • Laboratoire Leprince-Ringuet
  • Institute of Physics
  • Max-Planck-Institut für Kernphysik (MPIK)

Abstract

The radiative decay Λb0→Λγ is observed for the first time using a data sample of proton-proton collisions corresponding to an integrated luminosity of 1.7 fb-1 collected by the LHCb experiment at a center-of-mass energy of 13 TeV. Its branching fraction is measured exploiting the B0→K∗0γ decay as a normalization mode and is found to be ℬ(Λb0→Λγ)=(7.1±1.5±0.6±0.7)×10-6, where the quoted uncertainties are statistical, systematic, and systematic from external inputs, respectively. This is the first observation of a radiative decay of a beauty baryon.

Details

Original languageEnglish
Article number031801
Number of pages11
JournalPhysical Review Letters
Volume123
Issue number3
Early online date15 Jul 2019
Publication statusPublished - 19 Jul 2019

ASJC Scopus subject areas