Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-06-28
Phys.Lett. B487 (2000) 306-312
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages with 5 included eps figures
Scientific paper
10.1016/S0370-2693(00)00834-0
We present a bound on the weak phase $\alpha$ from isospin-breaking effects in weak radiative decays, which requires the CP-averaged branching ratios for the weak radiative decays $B^\pm\to \rho^\pm \gamma$, $B^0\to \rho^0/\omega \gamma$, $B\to K^* \gamma$ and the photon energy spectrum in $B\to\gamma \ell\nu_\ell$. We carefully identify all sources of isospin breaking, which could possibly mask information about the CKM parameters. They are introduced by diagrams with photon bremsstrahlung off the spectator quark and diagrams with annihilation penguin topologies. The former can be eliminated by combining $B\to\rho\gamma$ and $B\to K^{*}\gamma$ data, whereas the latter effects are OZI-suppressed and can be controlled by measuring also the modes $B_s\to \rho(\omega)\gamma$. The resulting bound excludes values of $\alpha$ around $90^\circ$, provided that the combined ratio ${\cal B}(B^\pm \to \rho^\pm\gamma)/{\cal B}(B^0 \to \rho^0/\omega\gamma) \times {\cal B}(B^0 \to K^{*0}\gamma)/{\cal B}(B^\pm \to K^{*\pm}\gamma)$ is found to be different from 1.
No associations
LandOfFree
Bound on $\cosα$ from exclusive weak radiative B decays does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Bound on $\cosα$ from exclusive weak radiative B decays, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bound on $\cosα$ from exclusive weak radiative B decays will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-490152