CP Violation in Exclusive B Decays : Recoil Phase Effect †
نویسنده
چکیده
In the perturbative QCD approach to exclusive B decays to two light mesons, the leading twist contribution corresponds to those diagrams in the Lepage-Brodsky expansion in which the would be spectator quark receives its recoil momentum via one gluon exchange. We show that the resulting amplitude, which in the spectator model is real, acquires an imaginary part which may be comparable in size to its real part. Thus, this source of the strong interaction phase in the amplitude must be taken into account in general to discuss, reliably, the expectations for CP violation in B decays at any B-Factory type scenario.
منابع مشابه
00 06 35 7 v 4 1 0 Ju l 2 00 1 Recoil Phase Effect in Exclusive B Decays : Implications for CP Violation †
In the perturbative QCD approach to exclusive B decays to two light mesons, the leading twist contribution corresponds to those diagrams in the Lepage-Brodsky expansion in which the would be spectator quark receives its recoil momentum via one gluon exchange. We show that the resulting amplitude, which in the spectator model is real, acquires an imaginary part which may be comparable in size to...
متن کاملK(k)x: Decay Distributions, Branching Ratios and Cp Asymmetries
The semi-inclusive charmless hadronic decays B → K(K)X , where X is a hadronic recoil system containing no charmed and strange particles, are useful for studying direct CP violation and determining the weak phase γ . Direct CP violation can also be studied with exclusive or inclusive charmless hadronic B decays. Although theoretical uncertainties in inclusive decays may be small, it is experime...
متن کاملB Decays and CP Violation
We review the status of the theory and phenomenology of heavy-quark symmetry, exclusive weak decays of B mesons, inclusive decay rates and lifetimes of b hadrons, and CP violation in B-meson decays. (To appear in International Journal of Modern Physics A) CERN-TH/96-55 April 1996 International Journal of Modern Physics A, f c World Scientific Publishing Company B DECAYS AND CP VIOLATION MATTHIA...
متن کاملEffects of the Space-like Penguin Diagrams on CP Asymmetries in Exclusive B Decays
The space-like penguin contributions were ignored on little ground in many previous studies of nonleptonic B transitions and CP violation. Taking the penguin-dominated channels B− u → K̄0π− and B− u → K0K− for example, we illustrate the non-negligible effects of the space-like penguin diagrams on CP asymmetries. Some qualitative remarks are given on the gluonic penguin picture and direct CP viol...
متن کاملClosing in on B-cp
Major new experimental efforts on detecting CP violation in B decays will very soon go on the air. Recent developments suggest that final state interaction phases in exclusive decays of B are unlikely to be small indicating the possibility of observable direct CP asymmetries in these channels. CLEO results on charmless hadronic modes suggest penguin amplitudes are rather big implying that the e...
متن کامل