Measurements of charmless B decays related to alpha at BaBar

Details Measurements of charmless B decays related to alpha at BaBar Measurements of charmless B decays related to alpha at BaBar

2009-09-30

arxiv.org/abs/0909.5646v1

PoS EPS-HEP2009 2009:162,2009

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, contributed to the Proceedings of EPS 2009, Europhysics Conference on High Energy Physics (Krakow)

Scientific paper

We report recent measurements of the CKM angle alpha using data collected by the BABAR detector at the PEP-II asymmetric-energy e+e- collider at the SLAC National Accelerator Laboratory. In addition to improved constraints on alpha from the decays B+ -> rho+ rho0, we also present preliminary results of neutral and charged B meson decays to K_1(1270) pi and K_1(1400) pi and its impact on the estimate for the CKM angle alpha based on time-dependent analysis of CP-violating asymmetries in B0 -> a_1(1260) pi. Moreover we report the first observation of the decay B -> a_1(1260)+ a_1(1260)-; this mode can be used, in principle, to provide an indipendent measurement of alpha.

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