Orateur
M.
Andrey Tayduganov
(LPT/LAL, Orsay, France)
Description
Recently the radiative $B$ decay to the strange axial-vector mesons, $B\to K_1(1270) \gamma$, has been observed with rather large branching ratio. This process is particularly interesting as the subsequent $K_1$ decay into its three body final state allows us to determine the polarization of the photon, which is mostly left- (right-)handed for $\overline{B} (B)$ in the SM while various new physics models predict additional right- (left-)handed components. A new method is proposed to determine the polarization, exploiting the full Dalitz plot distribution, which seems to reduce significantly the statistical errors.
This polarization measurement requires however a detailed knowledge of the $K_1 \to K \pi \pi$ strong interaction decays, namely, the various partial wave amplitudes into the several possible quasi two-body channels, as well as their relative phases.
The pattern of partial waves is especially complex for the $K_1(1270)$. We attempt to obtain the information through the combination of an experimental input and a theoretical one, provided by the $^3P_0$ quark-pair-creation model.
Auteurs principaux
Dr
Alain Le Yaouanc
(LPT. Orsay, France)
M.
Andrey Tayduganov
(LPT/LAL, Orsay, France)
Dr
Emi Kou
(LAL, Orsay, France)
