Ying-Ying Fan

Revisiting the pure annihilation decays

In this work, we recalculate the charmless pure annihilation decays

B_s\to \pi^+ \pi^-

B_s\to \pi^+ \pi^-

and

and

B^0 \to K^+ K^-

B^0 \to K^+ K^-

: the data and the pQCD predictions

by using the perturbative QCD (pQCD) factorization approach, and compare the pQCD predictions with currently available experimental measurements. We used the same set of relevant input parameters and wave functions to make the calculations for the considered decay modes and found the following results: (a) one can provide a consistent pQCD interpretation for both the measured

Study of

Br(B_s^0 \to \pi^+ \pi^-)

\bar{B}_s^0 \to (D_s^+,D_s^{*+}) l^-\bar{\nu}_l

and

decays in the pQCD factorization approach

Br(B_d^0 \to K^+ K^-)

NLO twist-3 contribution to the pion electromagnetic form factors in

simultaneously; (b) the pQCD predictions for

k_T

Br(B_s^0 \to \pi^+\pi^-)