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.
Measurement of the B0→ ρ(770)0γ branching fraction
2025
Settore FIS/01 - Fisica Sperimentale
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
B Physics; Flavour Physics; Hadron-Hadron Scattering; Rare Decay
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/165244
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