# First Observation of the Radiative Decay Λ0b to Λγ

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## Abstract

The radiative decay $\Lambda_{b}^{0} \to \Lambda \gamma$ 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 $B^{0} \to K^{*0}\gamma$ decay as a normalization mode and is found to be $\mathcal{B(\Lambda_{b}^{0} \to \Lambda \gamma)}$ = ($7.1\pm 1.5\pm 0.6\pm 0.7$) $\times 10^{-6}$, 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 language English 031801 Physical Review Letters 123 3 15 Jul 2019 https://doi.org/10.1103/PhysRevLett.123.031801 Published - 19 Jul 2019

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