First Observation of the Radiative Decay Λb0 → Λγ

(LHCb Collaboration)

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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.

Original languageEnglish (US)
Article number031801
JournalPhysical Review Letters
Volume123
Issue number3
DOIs
StatePublished - Jul 15 2019

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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