The radiative decay Λb0→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 B0→K∗0γ decay as a normalization mode and is found to be B(Λb0→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.

Aaij, R., Abellan Beteta, C., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., et al. (2019). First Observation of the Radiative Decay Λb0 → Λγ. PHYSICAL REVIEW LETTERS, 123(3), 031801 [10.1103/PhysRevLett.123.031801].

First Observation of the Radiative Decay Λb0 → Λγ

Borsato M.;Calvi M.;Carniti P.;Fazzini D.;Gotti C.;Martinelli M.;Petruzzo M.;
2019

Abstract

The radiative decay Λb0→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 B0→K∗0γ decay as a normalization mode and is found to be B(Λb0→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.
Articolo in rivista - Articolo scientifico
LHCb, Flavour Physics, B physics, Baryon decays, Radiative decay
English
2019
123
3
031801
031801
none
Aaij, R., Abellan Beteta, C., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., et al. (2019). First Observation of the Radiative Decay Λb0 → Λγ. PHYSICAL REVIEW LETTERS, 123(3), 031801 [10.1103/PhysRevLett.123.031801].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/247132
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