Charmless 2- and 3-body B decays and the angle alpha (phi2).pdf

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Charmless 2- and 3-body B decays and the angle alpha (phi2).pdf

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Charmless 2- and 3-body B decays and the angle alpha (phi2)

a r X i v : h e p - e x / 0 4 1 0 0 5 6 v 1 2 0 O c t 2 0 0 4 SLAC-PUB-10807 BABAR-PROC-04/101 Charmless 2- and 3-body B decays and the angle α(φ2) Markus Cristinziani (representing the BABAR collaboration) Stanford Linear Accelerator Center Menlo Park, CA 94025 E-mail: markus@slac.stanford.edu Abstract We present preliminary measurements of branching fractions and CP -asymmetry parameters in two- and three-body charmless hadronic B decays. The available data sample consists of 227 million Υ (4S) → BB decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e? collider at SLAC. We establish the observation of the decays B0 → π0π0 and B0 → K0K0 and constrain the CKM angle α with a full SU(2) isospin analysis in the B → ππ system and with a B0 → π+π?π0 time-dependent Dalitz plot analysis. Contributed to the Proceedings of the 32nd International Conference on High Energy Physics, ICHEP’04, 16 August — 22 August 2004, Beijing, China Stanford Linear Accelerator Center, Stanford University, Stanford, CA 94309 Work supported in part by Department of Energy contract DE-AC02-76SF00515. 1 Introduction According to the Standard Model CP violation is attributed to the presence of one complex phase in the CKM quark-mixing matrix. The relations between the matrix elements Vij are usually represented as a triangle in the complex plane, the Unitarity Triangle. The program of the B factories aims at overconstraining its sides and angles. Most measurements of branching fractions and CP parameters presented in this talk can be used to extract information about the angle α = arg [?VtdV ?tb/VudV ?ub]. More detail about the analyses presented here can be found in the conference contributions[1]. 2 Hadronic Charmless B Decays These results are based on the analysis of 227 million BB decays recorded by the BABAR detector at the PEP-II asymmetric-energy e+e? collider at SLAC. The BABAR detector is described in detail elsewhere[2]. Decays of a B meson into final states