CERN Accelerating science

Article
Report number	hep-ph/9604233 ; CERN-TH-96-068 ; EFI-96-10-[CHICAGO] ; TECHNION-PH-96-05
Title	Weak phases from B decays to kaons and charged pions
Author(s)	Dighe, A S ; Gronau, Michael ; Rosner, Jonathan L
Affiliation	(Univ. Chicago) ; (Technion Haifa) ; (CERN)
Publication	1996
Imprint	3 Apr 1996
Number of pages	29
In:	Phys. Rev. D 54 (1996) 3309-3320
DOI	10.1103/PhysRevD.54.3309
Subject category	Particle Physics - Phenomenology
Abstract	Phases of elements of the Cabibbo-Kobayashi-Maskawa (CKM) matrix can be obtained using decays of B mesons to \pi^+ \pi^-, \pi^\pm K^\mp, and \pi^+ K^0 or \pi^- \overline{K}^0. For B^0 {\rm or}  \overline{B}^0 \to \pi^+ \pi^-, one identifies the flavor of the neutral B meson at time of production and studies the time-dependence of the decay rate. The other processes are self-tagging and only their rates need be measured. By assuming flavor SU(3) symmetry and first-order SU(3) breaking, one can separately determine the phases \gamma \equiv {\rm Arg} V_{ub}^* and \alpha = \pi - \beta - \gamma, where \beta \equiv {\rm Arg} V_{td}^*. Special cases include the vanishing of strong interaction phase differences between amplitudes, the possibility of recovering partial information when \pi^+ \pi^- and \pi^\pm K^\mp decays cannot be distinguished from one another, and the use of a correlation between \gamma and \alpha in the region of allowed parameters.

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