Charmless 3-body B Decays: Resonant and Nonresonant Contributions
نویسنده
چکیده
Charmless 3-body decays of B mesons are studied using a simple model based on the framework of the factorization approach. We have identified a large source of the nonresonant signal in the matrix elements of scalar densities, e.g. 〈KK|s̄s|0〉. This explains the dominance of the nonresonant background in B → KKK decays, the sizable nonresonant fraction of order (35 ∼ 40)% in Kππ and K 0 ππ modes and the smallness of nonresonant rates in B → πππ decays. We have computed the resonant and nonresonant contributions to charmless 3-body decays and determined the rates for the quasi-twobody decays B → V P and B → SP . Time-dependent CP asymmetries sin 2βeff and ACP in K KKS ,KSKSKS , KSπ π and KSπ π modes are estimated.
منابع مشابه
CP violating phase γ and the partial widths asymmetry in B − → π + π − K − and B − → K + K − K − decays
Motivated by recent Belle measurement of the branching ratios B → ππK and B → KKK and B → χc0K, we investigate the CP violating asymmetry in the partial widths for the decays B → ππK and B → KKK, which results from the interference of the nonresonant decay amplitude with the resonant amplitude B → χc0K → ππK and B → χc0K → KKK. By taking γ ≃ 58 we predict that the partial widths asymmetry is re...
متن کاملThe penguin operators in nonresonant B − →
We investigate the contributions coming from the penguin operators in the nonresonant B → MM̄π (M = π, K, K) decays. The effective Wilson coefficients of the the strong penguin operators O4,6 are found to be relatively larger. We calculate the contributions arising from the O4 and O6 operators in the nonresonant decays B → MM̄π (M = π, K, K̄) using a model combining heavy quark symmetry and the ch...
متن کاملNonresonant Three-body Decays of D and B Mesons
Nonresonant three-body decays of D and B mesons are studied. It is pointed out that if heavy meson chiral perturbation theory (HMChPT) is applied to the heavy-light strong and weak vertices and assumed to be valid over the whole kinematic region, then the predicted decay rates for nonresonant charmless 3-body B decays will be too large and especially B− → π−K+K− greatly exceeds the current expe...
متن کاملResonant and nonresonant D + → K − π + semileptonic decays
We analyse the D + → K − π + semileptonic decay using the effective model, developed to described D → P lν l and D → V lν l decays. The light vector mesons are included into the model which combines the heavy quark effective Lagrangian and the chiral perturbation approach. The non-resonant and resonant contributions are compared. Without introducing any new parameter, we are able to correctly r...
متن کاملCharming penguin and direct CP-violation in charmless B decays
In the study of two-body charmlessB decays as a mean of looking for direct CP-violation and measuring the CKM mixing parameters in the Standard Model, the short-distance penguin contribution with its absorptive part generated by charm quark loop seems capable of producing sufficient B → Kπ decays rates, as obtained in factorization and QCD-improved factorization models. However there are also l...
متن کامل