| DATE: |
2011-11-04 13:30 - 14:30 |
| PLACE: |
4th building 1F, Seminar Hall |
| TITLE: |
Determining the photon polarization of the $b o sgamma$ using the $B o K_1(1270)gamma o(Kpipi)gamma$ decay |
| CONTACT: |
Masato Yamanaka, masato.yamanaka-AT-kek.jp |
| SPEAKER: |
Dr. Andrey Tayduganov (Orsay, IPN & Orsay, LPT ) |
| LANGUAGE: |
English |
| URL: |
http://research.kek.jp/group/www-theory/schedule.html |
| ABSTRACT: |
Recently the radiative $B$ decay to the strange axial-vector mesons, $B o K_1(1270) gamma$, has been observed with rather large rate. This process is particularly interesting as the subsequent $K_1$ decay into its three body final state allows to determine the polarization of the gamma, 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 strongly the statistical errors. In order to obtain a theoretical prediction for this polarization measurement, it is necessary to understand the hadronic $K_1 o K pi pi$ decay channel and its uncertainties. The strong decays of the $K_1$ mesons, namely the partial wave amplitudes as well as their relative phases, are revisited in the framework of the $^3P_0$ quark-pair-creation model. Then, the result on the sensitivity of the $B o K_1(1270) gamma$ process to the photon polarization is presented. |
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