[seminar] Andrey Tayduganov, 17. studenog 2010. (srijeda) u 11:00 c.t., IRB, seminar Zavoda za teorijsku fiziku

[Hrvoje Nikolic]

       INSTITUT Ruđer Bošković
       ZAVOD ZA TEORIJSKU FIZIKU
       Bijenička c. 54, Zagreb, Hrvatska


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                      SEMINAR ZAVODA ZA TEORIJSKU  FIZIKU
             (Zajednički seminari Zavoda za teorijsku fiziku i
 		Zavoda za eksperimentalnu fiziku IRB-a i
 		Zavoda za teorijsku fiziku PMF-a)

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  	Andrey Tayduganov, LPT Orsay/LAL


     "Determining the photon polarization of the $b\to s\gamma$ using the 
$B\to  K_1(1270) \gamma\to (K\pi\pi)\gamma$ decay"

       Vrijeme:  srijeda, 17. studenog 2010. (srijeda) 11.00, c.t.

       Mjesto:  Institut Ruđer Bošković, seminar Zavoda za teorijsku
fiziku

       Sazetak:
Recently the radiative $B$ decay to the strange axial-vector mesons, $B
\to K_1(1270) \gamma$, 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 $K_1 \to K \pi \pi$ 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 $B\to  K_1(1270) \gamma$
process to the photon polarization is presented.




      Voditelj seminara:
      Hrvoje Nikolic (hrvoje at thphys.irb.hr)


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