The first search for the rare radiative decay Ξb− → Ξ−γ 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 Ξb− → Ξ−J/ψ channel is used as normalization. No Ξb− → Ξ−γ signal is found and an upper limit of B(Ξb− → Ξ−γ) < 1.3 × 10−4 at 95% confidence level is obtained. [Figure not available: see fulltext.]
Search for the radiative Ξb− → Ξ − γ decay
Cardinale R.;Petrolini A.;Sergi A.;Spadaro Norella E.
2022-01-01
Abstract
The first search for the rare radiative decay Ξb− → Ξ−γ 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 Ξb− → Ξ−J/ψ channel is used as normalization. No Ξb− → Ξ−γ signal is found and an upper limit of B(Ξb− → Ξ−γ) < 1.3 × 10−4 at 95% confidence level is obtained. [Figure not available: see fulltext.]
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