# Measurement of $B \to X \gamma$ Decays and Determination of $|V_{td}/V_{ts}|$

Abstract : Using a sample of 383 million $B\bar{B}$ events collected by the $BaBar$ experiment, we measure sums of seven exclusive final states $B\to X_{d(s)}\gamma$, where $X_d$($X_s$) is a non-strange (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 $b \to d \gamma$ of $(7.2\pm 2.7(stat.)\pm 2.3(syst.))\times 10^{-6}$. Taking the ratio of $X_d$ to $X_s$ we find $\Gamma(b \to d \gamma)/\Gamma(b \to s \gamma) = 0.033 \pm 0.013 (stat.) \pm 0.009 (syst.),$ from which we determine $|V_{td}/V_{ts}|=0.177\pm 0.043$.
Document type :
Journal articles

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Contributor : Claudine Bombar <>
Submitted on : Monday, September 1, 2008 - 2:55:21 PM
Last modification on : Thursday, April 8, 2021 - 4:26:02 PM

### Citation

B. Aubert, M. Bona, Y. Karyotakis, J.P. Lees, V. Poireau, et al.. Measurement of $B \to X \gamma$ Decays and Determination of $|V_{td}/V_{ts}|$. Physical Review Letters, American Physical Society, 2009, 102, pp.161803. ⟨10.1103/PhysRevLett.102.161803⟩. ⟨in2p3-00315878⟩

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