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Determining the photon polarization of the b->s gamma using the B->K1(1270) gamma->(K pi pi) gamma decay

A. Tayduganov 1 E. Kou 2 A. Le Yaouanc 3
1 Groupe Théorie
LPT - Laboratoire de Physique Théorique d'Orsay [Orsay], LAL - Laboratoire de l'Accélérateur Linéaire
Abstract : 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.
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Conference papers
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http://hal.in2p3.fr/in2p3-00701631
Contributor : Sabine Starita <>
Submitted on : Friday, May 25, 2012 - 5:07:11 PM
Last modification on : Wednesday, September 16, 2020 - 5:37:35 PM

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  • HAL Id : in2p3-00701631, version 1

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A. Tayduganov, E. Kou, A. Le Yaouanc. Determining the photon polarization of the b->s gamma using the B->K1(1270) gamma->(K pi pi) gamma decay. Rencontre de Physique des Particules, Jan 2011, Clermont-Ferrand, France. ⟨in2p3-00701631⟩

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