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Measurement of B→Xγ Decays and Determination of |Vtd/Vts|
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Using a sample of 383 × 10 6 B ¯¯¯ B events collected by the BABAR experiment, we measure sums of seven exclusive final states B → X d ( s ) γ , where X d ( X s ) is a nonstrange (strange) charmless hadronic system in the mass range 0.6 - 1.8 GeV / c 2 . After correcting for unmeasured decay modes in this mass range, we obtain a branching fraction for b → d γ of ( 7.2 ± 2.7 ( stat ) ± 2.3 ( syst ) ) × 10 − 6 . Taking the ratio of X d to X s we find Γ ( b → d γ ) / Γ ( b → s γ ) = 0.033 ± 0.013 ( stat ) ± 0.009 ( syst ) , from which we determine | V t d / V t s | = 0.177 ± 0.043 .
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GARRA TICÓ, Jordi, GRAUGÉS POUS, Eugeni and BABAR Collaboration. Measurement of B→Xγ Decays and Determination of |Vtd/Vts|. Physical Review Letters. 2009. Vol. 102, num. 16, pags. 161803. ISSN 0031-9007. [consulted: 18 of June of 2026]. Available at: https://hdl.handle.net/2445/138267