Analysis of the electromagnetic form factors and the radiative decays of the vector heavy-light mesons

Abstract

In this article, we analyze the electromagnetic form factors of the vector heavy-light mesons to the pseudoscalar heavy-light mesons in the framework of three-point QCD sum rules, where the contributions of vacuum condensate terms $⟨\overline{q}q⟩$, $⟨\overline{q}{g}_s\sigma Gq⟩$, $⟨g_s^2{G}^2⟩$, $⟨f^3{G}^3⟩$ and $⟨\overline{q}q⟩⟨g_s^2{G}^2⟩$ are considered. With these results, we also obtain the radiative decay widths of the vector heavy-light mesons and then compare our results with those of other collaboration's. The final results about the radiative decay widths are $\Gamma (D^{\ast 0}\to D^0\gamma )=1.74_{-0.37}^{+0.40}$ keV, $\Gamma (D^{\ast +}\to D^{+}\gamma )=0.17_{-0.07}^{+0.08}$ keV, $\Gamma (D_s^{\ast }\to D_s\gamma )=0.029_{-0.008}^{+0.009}$ keV, $\Gamma (B^{\ast 0}\to B^0\gamma )=0.018_{-0.005}^{+0.006}$ keV, $\Gamma (B^{\ast +}\to B^{+}\gamma )=0.015_{-0.007}^{+0.007}$ keV and $\Gamma (B_s^{\ast }\to B_s\gamma )=0.016_{-0.005}^{+0.003}$ keV.