  Baryon number is conserved in the Standard Model (SM) of particle physics.
Baryon Number Violation (BNV) is one of the criteria to explain the matter
anti-matter asymmetry of the universe. Various beyond the SM (BSM) scenarios
motivate BNV. In that view, it becomes important to look for various BNV
decays. \\ In this work, we consider the BNV decay of heavy charmed meson to
anti-proton and positron. This decay proceeds via the dim-6 SM effective field
theory (SMEFT) operator and involves 12 independent form factors. We give
estimates for these form factors in the framework of Light Cone Sum Rules
(LCSR). As the interpolation current for the proton state is not unique, we
have considered different forms of proton interpolation current and discuss the
effect of the choice of the interpolation current.
