Author:
Chen 陈 Yu 宇,Fu 付 Hai-Bing 海冰,Zhong 钟 Tao 涛,Wu 吴 Sheng-Bo 胜波,Huang 黄 Dong 冬
Abstract
Abstract
In this paper, we investigate the charmed meson rare decay process
using an approach based on QCD sum rules. First, the pion twist-2, 3 distribution amplitude (DA) moments
and
are calculated up to the tenth and fourth orders, respectively, in the QCD sum rules according to the background field theory. After constructing the light-cone harmonic oscillator model for the pion twist-2, 3 DAs, we obtain their behaviors by matching the calculated ξ-moments. Then, the
transition form factors (TFFs) are calculated using an approach based on QCD light-cone sum rules. The vector form factor at the large recoil region is
. Using the rapidly converging simplified series expansion of
, we present the TFFs and corresponding angular coefficients in the whole squared momentum transfer physical region. Based on non-standard neutrino interactions, the
decay can be related to the
decay indirectly. Thus, we first describe the semileptonic decay process
, differential decay widths, and branching fraction with
. The
differential/total predictions for forward-backward asymmetry,
-differential flat terms, and lepton polarization asymmetry are also reported. The prediction for the
branching fraction is
.
Funder
National Natural Science Foundation of China