Weak phase alpha from B^0-> a_1^{+-}(1260) pi^{-+}

Details Weak phase alpha from B^0-> a_1^{+-}(1260) pi^{-+} Weak phase alpha from B^0-> a_1^{+-}(1260) pi^{-+}

2005-12-12

arxiv.org/abs/hep-ph/0512148v2

Phys.Rev.D73:057502,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, small changes, to be published in Physical Review D

Scientific paper

10.1103/PhysRevD.73.057502

Quasi two-body decays B^0(t)-> a_1^{+-}(1260) pi^{-+} identified by four charged pions determine a phase alpha_eff, which is equal to the weak phase alpha in the limit of vanishing penguin amplitudes. Applying flavor SU(3) to these decays and to B->a_1 K and B->K_1 pi, with K_1 an admixture of K_1(1270) and K_1(1400), we derive expressions providing bounds on alpha-alpha_{eff}. Higher precision in alpha may be achieved by an overall fit to a complete set of SU(3) related measurements. A method is sketched applying isospin symmetry to time-dependent invariant mass distributions in B->pi^+ pi^- pi^0 pi^0.

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