D*→ Dγ and B*→ Bγ as Derived from QCD Sum Rules

Abstract

The method of QCD sum rules in the presence of the external electromagnetic

$$\bar{B}_{d,s} \rightarrow D^{*}_{d,s} V$$ B ¯ d , s → D d , s ∗ V and $$\bar{B}_{d,s}^* \rightarrow D_{d,s} V$$ B ¯ d , s ∗ → D d , s V decays in QCD factorization and possible puzzles

“…Because the electromagnetic processes B * → Bγ dominate the decays of B * mesons, we take the approximation tot (B * ) (B * → Bγ ) in our evaluations. The theoretical predictions for (B * → Bγ ) have been given in various theoretical models [55][56][57][58][59][60][61]. In this paper, we take the central values of the latest results [60,61] …”

$$B^*_{s,d} \rightarrow \mu ^+ \mu ^-$$ B s , d ∗ → μ + μ - and its impact on $$B_{s,d} \rightarrow \mu ^+ \mu ^-$$ B s , d → μ + μ -

“…We can estimate g B s B * s γ in several ways, including the heavy-quark and chiral effective theories [31,32] with the radiative and pion transition widths of D * + , the light cone QCD sum rules [33,34], and the radiative M1 decay widths of B * s → B s γ from the potential model [27,35]. The heavy-quark and chiral effective theories yield the following expression [13][14][15]:…”

Revisit the radiative decays ofJ/ψandψ′→γηc(γηc′Li1, Zhao2 2011Phys. Rev. D26030View full textAdd to dashboardCite

“…This is also a value obtained in different approaches. For the coupling g D à s D s , the value ðÀ0:3 AE 0:1Þ GeV À1 from QCD sum rules (QSR) [42] is adopted. We note that their relative signs are consistent with each other in the framework of LQCD [43], QSR [42], and constituent quark model.…”

“…For the coupling g D à s D s , the value ðÀ0:3 AE 0:1Þ GeV À1 from QCD sum rules (QSR) [42] is adopted. We note that their relative signs are consistent with each other in the framework of LQCD [43], QSR [42], and constituent quark model. (iv) Another two undetermined parameters in our model are the cutoff parameter in the form factor and the relative phase between the quenched (i.e.…”