https://doi.org/10.1140/epjc/s10052-020-08767-1
Regular Article – Theoretical Physics
The semi-leptonic form factors of 
and 
in QCD sum rules
1
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
Received:
19
October
2020
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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