Regular Article – Theoretical Physics
The semi-leptonic form factors of and in QCD sum rules
School of Physical Science and Technology, Inner Mongolia University, 010021, Hohhot, People’s Republic of China
2 College of Information Science and Engineering, Ocean University of China, 266100, Qingdao, People’s Republic of China
3 Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, 53115, Bonn, Germany
Accepted: 13 December 2020
Published online: 22 December 2020
In this work, the full leading order results of the form factors for and are obtained in QCD sum rules. Contributions from up to dimension-5 have been considered. For completeness, we also study the two-point correlation function to obtain the pole residues of and , and higher accuracy is achieved. For the three-point correlation function, since stable Borel regions cannot be found, about uncertainties are introduced for the form factors of and . Our results for the form factors are consistent with those of the lattice QCD within errors.
© The Author(s) 2020
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