The radiative decay Λ_b^0→Λγ 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→K^*0γ decay as a normalization mode and is found to be B(Λ_b^0→Λγ)=(7.1±1.5±0.6±0.7)×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.
First Observation of the Radiative Decay Λ_b^0→Λγ
Veltri, M;
2019
Abstract
The radiative decay Λ_b^0→Λγ 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→K^*0γ decay as a normalization mode and is found to be B(Λ_b^0→Λγ)=(7.1±1.5±0.6±0.7)×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.File in questo prodotto:
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