Regular Article - Theoretical Physics
Lepton flavor violating decay
Department of Physics and Astrophysics, University of Delhi, Delhi, 110007, India
* e-mail: firstname.lastname@example.org
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