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



Aaij, R, Abdelmotteleb, ASW, Abellan Beteta, C, Abudinen, F, Ackernley, T, Adefisoye, AA, Adeva, B, Adinolfi, M, Adlarson, P, Agapopoulou, C
et al (show 1152 more authors) (2025) Measurement of the B0→ ρ(770)0γ branching fraction JOURNAL OF HIGH ENERGY PHYSICS, 2025 (12). 151-. ISSN 1126-6708, 1029-8479

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Abstract

The ratio between the branching fractions of the B0 → ρ(770)0γ and B0 → K*(892)0γ 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→ ρ(770)0γ 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 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.

Item Type: Article
Uncontrolled Keywords: B Physics, Flavour Physics, Hadron-Hadron Scattering, Rare Decay
Divisions: Faculty of Science & Engineering
Faculty of Science & Engineering > School of Engineering
Faculty of Science & Engineering > School of Physical Sciences
Faculty of Science & Engineering > School of Physical Sciences > Physics
Faculty of Science & Engineering > School of Engineering > Civil and Environmental Engineering
Depositing User: Symplectic Admin
Date Deposited: 05 Jan 2026 09:47
Last Modified: 16 Jun 2026 07:12
DOI: 10.1007/JHEP12(2025)151
Open Access URL: https://link.springer.com/content/pdf/10.1007/JHEP...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3196388
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