The ratio between the branching fractions of the B0 -> rho(770)0 gamma and B0 -> K*(892)0 gamma 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 isBB0 ->rho 7700 gamma BB0 -> K & lowast;8920 gamma=0.0189 +/- 0.0007 +/- 0.0005,\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \frac{\mathcal{B}\left({B}<^>0\to \rho {(770)}<^>0\gamma \right)}{\mathcal{B}\left({B}<^>0\to {K}<^>{\ast }{(892)}<^>0\gamma \right)}=0.0189\pm 0.0007\pm 0.0005, $$\end{document}where the first uncertainty is statistical and the second systematic. The branching fraction for B0 -> rho(770)0 gamma decays is hence obtained asBB0 ->rho 7700 gamma=7.9 +/- 0.3 +/- 0.2 +/- 0.2x10-7,\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \mathcal{B}\left({B}<^>0\to \rho {(770)}<^>0\gamma \right)=\left(7.9\pm 0.3\pm 0.2\pm 0.2\right)\times {10}<^>{-7}, $$\end{document}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
De Angelis, C.;Dettori, F.;Manca, G.;Oldeman, R.;Provenzano, D.;Saitta, B.;
2025-01-01
Abstract
The ratio between the branching fractions of the B0 -> rho(770)0 gamma and B0 -> K*(892)0 gamma 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 isBB0 ->rho 7700 gamma BB0 -> K & lowast;8920 gamma=0.0189 +/- 0.0007 +/- 0.0005,\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \frac{\mathcal{B}\left({B}<^>0\to \rho {(770)}<^>0\gamma \right)}{\mathcal{B}\left({B}<^>0\to {K}<^>{\ast }{(892)}<^>0\gamma \right)}=0.0189\pm 0.0007\pm 0.0005, $$\end{document}where the first uncertainty is statistical and the second systematic. The branching fraction for B0 -> rho(770)0 gamma decays is hence obtained asBB0 ->rho 7700 gamma=7.9 +/- 0.3 +/- 0.2 +/- 0.2x10-7,\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \mathcal{B}\left({B}<^>0\to \rho {(770)}<^>0\gamma \right)=\left(7.9\pm 0.3\pm 0.2\pm 0.2\right)\times {10}<^>{-7}, $$\end{document}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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