https://doi.org/10.1140/epjc/s10052-019-7530-9
Regular Article - Theoretical Physics
Lepton flavor violating 
decay
Department of Physics and Astrophysics, University of Delhi, Delhi, 110007, India
* e-mail: diganta99@gmail.com
Received:
24
September
2019
Accepted:
29
November
2019
Published online:
12
December
2019
Inspired by the recent hints of lepton flavor universality violation in 
and 
transitions, we study lepton flavor violating exclusive 
(
) decay, which is forbidden in the Standard Model. Starting from a general effective Hamiltonian for a 
transition that includes vector and axial-vector operators, and scalar and pseudo-scalar operators, we derive a two-fold decay distribution of . The distribution helps us to construct the differential branching ratio and the lepton-side forward–backward asymmetry, which are studied in a vector leptoquark model. The parameter space of the vector leptoquark model is constrained by low energy observables.
© The Author(s), 2019
