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The radiative decay Λ_{b}^{0}→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 B^{0}→K^{*0}γ decay as a normalization mode and is found to be B(Λ_{b}^{0}→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 publication

DOI

10.1103/physrevlett.123.031801

Type

Journal

Physical review letters

Publication Date

07/2019

Volume

123

Addresses

Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.

Keywords

LHCb Collaboration