Branching ratio andCPasymmetry ofBs→π+π−decays i

Abstract

In this paper, we calculate the decay rate and CP asymmetry of the B s → π + π − decay in perturbative QCD approach with Sudakov resummation. Since none of the quarks in final states is the same as those of the initial B s meson, this decay can occur only via annihilation diagrams in the standard model. Besides the current-current operators, the contributions from the QCD and electroweak penguin operators are also taken into account. We find that (a) the branching ratio is about 4 × 10 −7 ; (b) the penguin diagrams dominate the total contribution; and (c) the direct CP asymmetry is small in size: no more than 3%; but the mixing-induced CP asymmetry can be as large as ten percent testable in the near future LHC-b experiments.

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.…”

Erratum: Branching ratio andCPviolation ofBs→πKdecays in the perturbative QCD approach [Phys. Rev. D71, 074026 (2005)]

“…In the future CERN Large Hadron Collider beauty experiments (LHC-b), the heavier B s and B c mesons can also be produced. With the bright hope in LHC-b experiments and BTeV experiments at Fermilab, following a previous study of B s → π + π − decay [1], we continue to investigate other B s rare decays.…”

Hadronic decays of B→a1(1260)b1(1235Jing1, Liu2, Xiao3 2017Phys. Rev. D1000View 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.…”