https://doi.org/10.1140/epjc/s10052-020-7667-6
Regular Article - Theoretical Physics
FCNC transitions of 
to neutron in Bethe–Salpeter equation approach
1
College of Physics and Information Engineering, Shanxi Normal University, Linfen, 041004, People’s Republic of China
2
School of Ecology and Environment, Northwestern Polytechnical University, Xi’an, 710072, People’s Republic of China
3
College of Nuclear Science and Technology, Beijing Normal University, Beijing, 100875, People’s Republic of China
* e-mail: liu06_04@sxnu.edu.cn
** e-mail: xhguo@bnu.edu.cn
Received:
1
January
2020
Accepted:
18
January
2020
Published online:
2
March
2020
In a covariant quark–diquark model, we investigate the rare decay of 
and 
in the Bethe–Salpeter equation approach. In this model the baryons are treated as bound states of a constituent quark and a diquark interacting via a gluon exchange and the linear confinement. We find that the ratio of form factors R is varies from 
to 
and the branching ratios 
are 
and the branching ratio 
in central values of parameters.
© The Author(s), 2020
