A search of new physics with $D_{s}^{+}\rightarrow D^{+}\upsilon\overline{\upsilon}, B_{s}^{0}\rightarrow B^{0}\upsilon\overline{\upsilon}, K^{+}\rightarrow\pi^{+}\overline{\upsilon}\upsilon, D^{+}\rightarrow\pi^{+}\overline{\upsilon}\upsilon, D^{0}\rightarrow\pi^{0}\overline {\upsilon}\upsilon$ and $D_{s}^{+}\rightarrow K^{+}\overline{\upsilon}$

Abstract

We study the rare mesonic decays [Formula: see text]and [Formula: see text] for the search of new physics (NP) in the form of nonstandard neutrino interactions (NSIs). We calculate branching ratios (BRs) of these decays in the framework of NSIs. We try to explore the possibility for second and third generations of quarks in NSIs, exactly on the same footing as for leptonic case we have [Formula: see text] and [Formula: see text]. We show that there exist a possibility for [Formula: see text] and [Formula: see text] also from these reactions. Three other processes [Formula: see text] and [Formula: see text] are investigated with s and b quarks in the loop for NSIs instead of d quark only. Constraints on [Formula: see text] and [Formula: see text] (where q = s, b and l, l′ ≠ τ) are provided. We point out that constraints for u, c and t quarks are equal [Formula: see text] and similarly for d, s and b quarks the constraints are equal [Formula: see text].