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First Observation of the Radiative Decay Λ0b to Λγ

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


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.

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