The ratio between the branching fractions of the B0 → ρ(770)0 γ and B0 → K*(892)0 γ 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 BR(B0 → ρ(770)0 γ)/BR(B0 → K*(892)0 γ) = 0.0189 ± 0.0007 ± 0.0005, where the first uncertainty is statistical and the second systematic. The branching fraction for B0 → ρ(770)0 γ decays is hence obtained as BR(B0 → ρ(770)0 γ) = (7.9 ± 0.3 ± 0.2 ± 0.2) × 10^−7, where the last uncertainty is due to the branching fraction of the normalisation mode. This result assumes that both the ρ(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.

Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A.A., et al. (2025). Measurement of the B0 → ρ(770)0 γ branching fraction. JOURNAL OF HIGH ENERGY PHYSICS, 2025(12), 0-20 [10.1007/jhep12(2025)151].

Measurement of the B0 → ρ(770)0 γ branching fraction

Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Spedicato, E.;Zenesini, F.;
2025

Abstract

The ratio between the branching fractions of the B0 → ρ(770)0 γ and B0 → K*(892)0 γ 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 BR(B0 → ρ(770)0 γ)/BR(B0 → K*(892)0 γ) = 0.0189 ± 0.0007 ± 0.0005, where the first uncertainty is statistical and the second systematic. The branching fraction for B0 → ρ(770)0 γ decays is hence obtained as BR(B0 → ρ(770)0 γ) = (7.9 ± 0.3 ± 0.2 ± 0.2) × 10^−7, where the last uncertainty is due to the branching fraction of the normalisation mode. This result assumes that both the ρ(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.
2025
Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A.A., et al. (2025). Measurement of the B0 → ρ(770)0 γ branching fraction. JOURNAL OF HIGH ENERGY PHYSICS, 2025(12), 0-20 [10.1007/jhep12(2025)151].
Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adefisoye, A. A.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapopoul...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1036890
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