Abduladhem Abdulkareem Ali

An Analysis of two-body nonleptonic B decays involving light mesons in the standard model

We report a theoretical analysis of the exclusive non-leptonic decays of B mesons into two light mesons,some of which have been measured recently by the CLEO collaboration. Our analysis is carried out in the context of an effective Hamiltonian based on the Standard Model using next-to-leading order perturbative QCD calculations. Using a factorization ansatz for the hadronic matrix elements, we show that existing data are accounted for in this approach. Thus, theoretical scenarios with a substantially enhanced Wilson coefficient of the chromomagnetic dipole operator (as compared to the SM) and/or those with a substantial color-singlet

Inclusive decay rate for B→Xd+γ in next-to-leading logarithmic order and CP asymmetry in the standard model

c\bar{c}

Contribution of b→sgg through the QCD anomaly in exclusive decays B±→(η′,η)(K±,K∗±) and B0→(η′,η)(K0,K∗0)

component in the wave function of

Contribution of b→sgg through the QCD anomaly in exclusive decays and

\eta^\prime

Photon energy spectrum in B ? X S + ? and comparison with data

are not required by these data. Implications of some of these measurements for the parameters of the CKM matrix are presented.

Contribution of ? through the QCD anomaly in exclusive decays ? and ?

Abstract We compute the decay rate for the Cabibbo-Kobayashi-Maskawa (CKM)-suppressed electromagnetic penguin decay B → X d +γ (and its charge conjugate) in the next-to-leading order in QCD, including leading power corrections in 1/mb2 and 1/mc2 in the standard model. The average branching ratio 〈 B (B→X d +γ)〉 of the decay B→Xd+γ and its charge conjugate B → X d +γ is estimated to be in the range 6.0×10 −6 ≤〈 B (B→X d +γ)〉≤2.6×10 −5 , obtained by varying the CKM-Wolfenstein parameters ρ and η in the range −0.1≤ρ≤0.4 and 0.2≤η≤0.46 and taking into account other parametric dependence. In the NLL approximation and in the stated range of the CKM parameters, we find the ratio R(dγ/sγ)≡〈 B (B→X d γ)〉/〈 B (B→X s γ) to lie in the range 0.017≤R(dγ/sγ)≤0.074. Theoretical uncertainties in this ratio are estimated and found to be small. Hence, this ratio is well suited to provide independent constraints on the CKM parameters. The CP-asymmetry in the decay rates, defined as a CP (B→X d γ)≡(Γ(B→X d γ)−Γ( B → X d γ))/(Γ(B→X d γ)+Γ( B → X d γ)) , is found to be in the range (7−35)%. Both the decay rates and CP asymmetry are measurable in forthcoming experiments at B factories and possibly at HERA-B.

Estimates of the weak annihilation contributions to the decays B ? ? + ? and B ? ? + ?

Abstract We compute the decay rates for the exclusive decays B ± →(η ′ ,η)(K ± ,K ∗± ) and B 0 →(η ′ ,η)(K 0 ,K ∗0 ) in a QCD-improved factorization framework by including the contribution from the process b→sgg→s(η′,η) through the QCD anomaly. This method provides an alternative estimate of the contribution b→sc c →s(η,η ′ ) to these decays as compared to the one using the intrinsic charm content of the η′ and η mesons determined through the decays J/ψ→(η,η′,ηc)γ. The advantage of computing the relevant matrix elements via the QCD anomaly governing the transition gg→(η′,η) is that there is no sign ambiguity in these contributions relative to the matrix elements from the rest of the operators in the weak effective Hamiltonian. Numerically, the QCD anomaly method and the one using the radiative decays J/ψ→(η,η′,ηc)γ give similar branching ratios for the decays of interest here. The resulting branching ratios are compared with the CLEO data on B±→η′K± and B0→η′K0 and predictions are made for the rest.We compute the decay rates for the exclusive decays

CONTRIBUTION OF B SGG THROUGH THE QCD ANOMALY IN EXCLUSIVE DECAYS B (ETA', ETA )(K, K*) AND B0 (ETA ', ETA )(K0, K*0)

B^{\pm} \to (\eta^{\prime},\eta) (K^{\pm}, K^{*\pm})

Contribution of b -> sgg through the QCD anomaly in exclusive decays B+/-->(eta ',eta)(K+/-,K*+/-)and B-0 ->(eta ',eta)(K-0,K-*0)

and

Inclusive decay rate for B? X d + ? in next-to-leading logarithmic order and CP asymmetry in the sta

B^{0}\to (\eta^{\prime},\eta) (K^{0}, K^{*0})