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A search of new physics with
and 
Preview AbstractWe study the rare mesonic decays
and 
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 
and 
. We show that there exist a possibility for 
and 
also from these reactions. Three other processes 
and 
are investigated with s and b quarks in the loop for NSIs instead of d quark only. Constraints on 
and 
(where q = s, b and l, l′ ≠ τ) are provided. We point out that constraints for u, c and t quarks are equal 
and similarly for d, s and b quarks the constraints are equal 
.