Charged lepton flavor violation associated with heavy quark production in deep inelastic lepton-nucleon scattering via scalar exchange

We study charged lepton flavor violation (CLFV) associated with heavy quark pair production in lepton-nucleon deep-inelastic scattering $ell_i N to ell_j qbar{q} X$. Here $ell_i$ and $ell_j$ denote the initial and final leptons, $N$ and $X$ are initial nucleon and arbitrary final hadronic system, respectively. We employ a model Lagrangian in which a scalar and psuedoscalar mediator generate the CLFV. We derive heavy quark structure functions for scalar and pseudoscalar currents, and compute momentum distributions of the final lepton for the process. Our focus is on the heavy quark mass effects in the final lepton momentum distribution. We clarify a necessity of inclusion of the heavy quark mass to rise a sensitivity of search for CLFV in the deep inelastic scattering.