Heavy to light meson exclusive semileptonic decays in effective field theory of heavy quarks

Abstract

We present a general study on exclusive semileptonic decays of heavy (B, D, B s ) to light (π, ρ, K, K * ) mesons in the framework of effective field theory of heavy quark. Transition matrix elements of these decays can be systematically characterized by a set of wave functions which are independent of the heavy quark mass except for the implicit scale dependence. Form factors for all these decays are calculated consistently within the effective theory framework using the light cone sum rule method at the leading order of 1/m Q expansion. The branching ratios of these decays are evaluated, and the heavy and light flavor symmetry breaking effects are investigated. We also give comparison of our results and the predictions from other approaches, among which are the relations proposed recently in the framework of large energy effective theory.

Study of dynamics ofD0→K−e+νeAblikim1, Ачасов2, Ai3 et al. 2015Phys. Rev. D7912890View full textAdd to dashboardCite

“…In the table, we also compare our branching fraction measurements to theoretical predictions for these two semileptonic decays. The precision of our measured branching fractions are much higher than those of the LQCD [14,32], the QCD sum rule [33] and the LCSR [34] predictions.…”

“…−0.11 ± 0.04 CLEO [26] 3.82 ± 0.11 ± 0.25 BES-II [21] 3.82 ± 0.40 ± 0.27 0.33 ± 0.13 ± 0.03 CLEO-c [28] 3.50 ± 0.03 ± 0.04 0.288 ± 0.008 ± 0.003 Belle [29] 3.45 ± 0.07 ± 0.20 0.255 ± 0.019 ± 0.016 BABAR [30,31] 3.522 ± 0.027 ± 0.045 ± 0.065 0.2770 ± 0.0068 ± 0.0092 ± 0.0037 BESIII (This work) 3.505 ± 0.014 ± 0.033 0.295 ± 0.004 ± 0.003 LQCD [14] 3.77 ± 0.29 ± 0.74 0.316 ± 0.025 ± 0.070 LQCD [32] 2.99 ± 0.45 ± 0.74 0.24 ± 0.06 QCD SR [33] 2.7 ± 0.6 LCSR [34] 3.9 ± 1. distributions that follow the procedure described in Section IV C give the signal yields N observed for each q 2 bin. In these figures, the blue solid lines show the best fit to the data, while the red dashed lines show the background.…”

1/mQ corrections to B→ρlν decay and Wang1, Wu2, Zhong3 2005Physics Letters BSelf Cite4180View full textAdd to dashboardCite

“…The discussion concerning 1/m Q order corrections to B → ρlν decay in this paper is also applicable to other heavy to light vector meson decays. [10,12], while the solid curves are the results with including 1/mQ order correction.…”

“…(4.10) and (4.11). It is 12) where the first and second errors correspond to the experimental and theoretical uncertainties, respectively. This value may be compared with the ones previously obtained [10,11,13,16,26].…”

“…This symmetry is applied to study B(D) (s) → π(ρ, K, K * )lν decays in Refs. [10][11][12], where the finite heavy quark mass (m Q ) corrections are not considered. Ref.…”