The ratio between the branching fractions of the B0 -> rho(770)0 gamma and B0 -> K*(892)0gamma decays is measured with proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb-1. The measured value is (Formula presented.) where the first uncertainty is statistical and the second systematic. The branching fraction for B0-> rho(770)0gamma decays is hence obtained as (Formula presented.) where the last uncertainty is due to the branching fraction of the normalisation mode. This result assumes that both the rho(770)0 and K*(892)0 decays saturate the dihadron mass spectra considered in the analysis. It is consistent with the current world-average value and by far the most precise measurement to date.
Measurement of the B0-> rho(770)0 gamma branching fraction
Kleijne N.Membro del Collaboration Group
;Morello M. J.Membro del Collaboration Group
;Passaro D.Membro del Collaboration Group
;Pica L.Membro del Collaboration Group
;Riccardi D.Membro del Collaboration Group
;Xu A.Membro del Collaboration Group
;
2025
Abstract
The ratio between the branching fractions of the B0 -> rho(770)0 gamma and B0 -> K*(892)0gamma decays is measured with proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb-1. The measured value is (Formula presented.) where the first uncertainty is statistical and the second systematic. The branching fraction for B0-> rho(770)0gamma decays is hence obtained as (Formula presented.) where the last uncertainty is due to the branching fraction of the normalisation mode. This result assumes that both the rho(770)0 and K*(892)0 decays saturate the dihadron mass spectra considered in the analysis. It is consistent with the current world-average value and by far the most precise measurement to date.| File | Dimensione | Formato | |
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JHEP12(2025)151.pdf
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