Extracting and using photon polarization information in radiative B decays

Details Extracting and using photon polarization information in radiative B decays Extracting and using photon polarization information in radiative B decays

2000-05-08

arxiv.org/abs/hep-ph/0005069v2

JHEP 0006 (2000) 029

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages ReVTeX with 1 included figure; 2 references added

Scientific paper

10.1088/1126-6708/2000/06/029

We discuss the uses of conversion electron pairs for extracting photon polarization information in weak radiative B decays. Both cases of leptons produced through a virtual and real photon are considered. Measurements of the angular correlation between the $(K\pi)$ and $(e^+e^-)$ decay planes in $B\to K^*(\to K\pi)\gamma^{(*)}(\to e^+e^-)$ decays can be used to determine the helicity amplitudes in the radiative $B\to K^*\gamma$ decay. A large right-handed helicity amplitude in $\bar B$ decays is a signal of new physics. The time-dependent CP asymmetry in the $B^0$ decay angular correlation is shown to measure $\sin 2\beta$ and $\cos 2\beta$ with little hadronic uncertainty.

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