Weak phases from B decays to kaons and charged pions

Dighe, Amol S. ; Gronau, Michael ; Rosner, Jonathan L. (1996) Weak phases from B decays to kaons and charged pions Physical Review D, 54 (5). Article ID 3309. ISSN 0556-2821

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Official URL: http://journals.aps.org/prd/abstract/10.1103/PhysR...

Related URL: http://dx.doi.org/10.1103/PhysRevD.54.3309


Phases of elements of the Cabibbo-Kobayashi-Maskawa (CKM) matrix can be obtained using decays of B mesons to π+π, π±K+, and π+K0 or π0. For B0 or B̅0→π+π, 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 to be measured. By assuming flavor SU(3) symmetry and first-order SU(3) breaking, one can separately determine the phases γ≡Arg Vub and α=π−β−γ, where β≡Arg Vtd. Special cases include the vanishing of strong interaction phase differences between amplitudes, the possibility of recovering partial information when π+π and π±K decays cannot be distinguished from one another, and the use of a correlation between γ and α in the region of allowed parameters.

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