decay process within the QCDSR approach

• Published in: Chinese physics C 2024-06, Vol.48 (6), p.63107
• Main Authors: Chen 陈, Yu 宇, Fu 付, Hai-Bing 海冰, Zhong 钟, Tao 涛, Wu 吴, Sheng-Bo 胜波, Huang 黄, Dong 冬
• Format: Article
• Language: English
• ISSN: 1674-1137; 2058-6132
• DOI: 10.1088/1674-1137/ad30f0

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 .