Pathways to a clean γ (ϕ_{3}): From B to super B factories

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Abstract
The implementation of various methods for the determination of γ through direct CP violation arising in the interference of b→c and b→u processes in charged as well as neutral B meson decays are considered. We show that the inclusion of D0 resulting from D*0→D0+π0(γ), say, via B→KD*0 makes a significant difference in the attainable accuracy for γ. Both exclusive and inclusive decays of the B± and B0 to states containing D0/D¯0 followed by both inclusive and exclusive decays of the D0 are discussed. It is shown that with statistics which might be obtained at B factories (5–10×108 B pairs) a 1σ determination of γ to ≈±8° may be possible, depending on the efficiency of reconstruction, backgrounds, and the details of the decay amplitudes involved. The role of data from a charm factory as well as effects of D0 mixing are discussed. Extraction of γ with accuracy that is roughly commensurate with the intrinsic theory error of these methods (i.e., around 0.1%), which is an important goal, will require >1010 B pairs, namely, a super B factory.