Search for the radiative ${\Xi }_b^{-}\to {\Xi }^{-}\gamma$ decay

Abstract

The first search for the rare radiative decay ${\Xi }_b^{-}\to {\Xi }^{-}\gamma$ is performed using data collected by the LHCb experiment in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb${}^{-1}$. The ${\Xi }_b-\to {\Xi }^{-}J/\psi$ channel is used as normalization. No ${\Xi }_b^{-}\to {\Xi }^{-}\gamma$ signal is found and an upper limit of $\mathcal{B}({\Xi }_b^{-}\to {\Xi }^{-}\gamma )<1.3\times 10^{-4}$ at 95% confidence level is obtained.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-017.html (LHCb public pages)

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• Observation of the ${\Lambda }_b^0\to J/\psi {\Xi }^{-}{K}^{+}$ and ${\Xi }_b^0\to J/\psi {\Xi }^{-}{\pi }^{+}$ decays
• ${\Xi }_b\to \Xi$ form factors from lattice QCD and Standard-Model predictions for ${\Xi }_b\to \Xi {\mu }^{+}{\mu }^{-}$ and ${\Xi }_b\to \Xi \gamma$ decays