Abstract
We study rare decays [Formula: see text] and [Formula: see text] in the framework of nonstandard neutrino interactions (NSIs). We calculate branching ratios of these decays. We explore the possibility for second generation of quarks in NSIs just like leptonic contribution in [Formula: see text] and [Formula: see text]. We study the dependence of [Formula: see text] on [Formula: see text]. We show that there exists a possibility for [Formula: see text], also from this reaction and other two reactions, [Formula: see text] and [Formula: see text]. Three other processes, [Formula: see text] and [Formula: see text] are investigated with s quark in the loop for NSIs instead of d quark. Constraints on [Formula: see text] and [Formula: see text] are provided. We point out that constraints for both u and c quark are equal [Formula: see text] and similarly for d and s quarks the constraints are equal [Formula: see text].
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