Study of pure annihilation type decaysB D _sK

Abstract

In this work, we calculate the rare decays B 0 → D * − s K + and B + → D * + s K 0 in perturbative QCD approach with Sudakov resummation. We give the branching ratio of 10 −5 for B 0 → D * − s K + , which will be tested soon in B factories. The decay B + → D * + s K 0 has a very small branching ratio at O(10 −8 ), due to the suppression from CKM matrix elements |V * ub V cd |. It may be sensitive to new physics contributions. *

Study of Bc→DS decays in the perturbative QCD approach

“…We also note that for the considered B c → D ðÃÞ S decays, the annihilation-type diagrams will provide sizable contributions to the amplitudes and even dominate the amplitudes due to the enhancement from the large CKM matrix elements V cb and V csðdÞ . It is worth mentioning that the PQCD approach is an effective approach for calculating the nonfactorizable and annihilation diagrams, which can be confirmed by the precise predictions for the B → J=ψD [22] and [23]. So, for these considered decay channels, the predictions in the PQCD approach are reliable.…”

B→DK0,2*decays and theCPphase angleγKim1, Li2, Wang3 2013Phys. Rev. D9071View full textAdd to dashboardCite

“…[13,14] for the recent developments and applications of the PQCD approach), to calculate the branching ratios, strong phases, and CP asymmetries. The perturbative QCD approach is formulated on the basis of k T factorization, and has been applied to B meson decays into charmed meson in a number of references and a global agreement of the results with the available data is found [15][16][17][18][19][20][21][22]. One of the most successful predictions is r K ¼ 0:092 þ0:012þ0:003 À0:003À0:003 [21], in good agreement with the data [7].…”

Improved estimates of theB(s)→VVdecays in perturbative QCD approach

“…It is worth mentioning that in this framework, the so-called annihilation diagrams are also perturbatively calculable without introducing additional parameters [21,22]. The PQCD approach has been successfully used to study a number of pure annihilation type decays, and these predictions were confirmed subsequently in experiments [8,[22][23][24][25]. Thus, in our view, this method is reliable in dealing with the pure annihilation-type and annihilation-dominated decays as well.…”

“…This form factor effectively suppresses the end-point contribution of the distribution amplitude of the mesons in the small transverse momentum region, making the calculation in the PQCD approach reliable. It is worth mentioning that in this framework, the so-called annihilation diagrams are also perturbatively calculable without introducing additional parameters [21,22]. The PQCD approach has been successfully used to study a number of pure annihilation type decays, and these predictions were confirmed subsequently in experiments [8,[22][23][24][25].…”