Characterize the properties of $D_s^{+}$-meson decay constant and leptonic decays by using QCD sum rules within background field theory framework

Jian-Qi Chen, Ya-Xiong Wang, Hai-Bing Fu

The leptonic decays of the $D_s^{+}$-meson have received considerable attention in recent years. In this work, we perform a precise calculation of the decay constant $f_{D_s^{+}}$ usin…