Revisiting the pure annihilation decaysBs→π+π−andB0→K+

Abstract

In this work, we recalculate the charmless pure annihilation decays B s ! þ À and B 0 ! K þ K À by using the perturbative QCD (pQCD) factorization approach, and compare the pQCD predictions with currently available experimental measurements. By numerical calculations and phenomenological analysis, we found the following results: (a) one can provide a consistent pQCD interpretation for both the measured branching ratio BrðB 0 s ! þ À Þ and BrðB 0 d ! K þ K À Þ simultaneously; (b) the pQCD predictions for BrðB 0 s ! þ À Þ obtained by different authors are well consistent with each other; (c) our new pQCD prediction for BrðB 0 d ! K þ K À Þ agrees well with the measured values from CDF and LHCb Collaborations; and (d) the CP-violating asymmetry A CP ðB 0 d ! K þ K À Þ % 19%, which is large and may be detected at the LHCb and future Super-B factory experiments.

Spectator scattering and annihilation contributions as a solution to theπKandππpuzzles within QCD factorization approach

“…If so, then ∆A will depend strongly on the nonfactorizable annihilation parameters (ρ only. The factorizable annihilation contributions vanish due to the isospin symmetry, which is consistent with the pQCD calculation [7]. The large branching ratio Eq.…”

“…By introducing the parton transverse momentum and the Sudakov factor to regulate the endpoint divergence, there is a large complex annihilation contribution within the perturbative QCD (pQCD) approach [8,9]. The latest renewed pQCD [7] give an appropriate account of the CDF and LHCb measurements within uncertainties. In the QCD factorization (QCDF) framework [12], the endpoint divergence in annihilation amplitudes is usually parameterized by X A (ρ A , φ A ) (see Eq.…”

S-wave resonance contributions to theB(s)0→JWang1, Li2, Wang3 et al. 2015Phys. Rev. DSelf Cite

“…The distribution amplitudes and the relevant parameters for the B 0 and B s mesons can be found in Ref. [58].…”

Hadronic decays of B→a1(1260)b1(1235Jing1, Liu2, Xiao3 2017Phys. Rev. DSelf Cite1000View full textAdd to dashboardCite

“…It is worth stressing that the observations of the pure annihilation B 0 s → π + π − and B 0 d → K + K − decays performed by the CDF [35] and LHCb [36] collaborations have confirmed the pQCD calculations [7,37,38] of the annihilation type diagrams 1 . Moreover, both of a 1 and b 1 are axial-vector(A) states but with different quantum numbers J P C = 1 +− and 1 ++ correspondingly.…”