First observation of the radiative decay ${\Lambda }_b^0\to \Lambda \gamma$

LHCb Collaboration, R. Aaij, C. Abellán Beteta +848

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 $1.7f{b}^{-1}$ co…