Abstract
Rare decays of hyperons involving di-neutrinos in the final state [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] in the Standard Model and beyond are studied. It is claimed that the branching ratios (Brs) calculated in this work are larger than the previously calculated values. For the search of NP the nonstandard neutrino interactions (NSI) are explored and constrains on NSI free parameters [Formula: see text] are found. Stringent bounds on [Formula: see text] of [Formula: see text] are obtained. It is shown that Brs could be closed to BES-III, if the constraints are [Formula: see text]. We predict that these reactions with the current value of parameter of [Formula: see text] will be in sensitivity of BES-III. To check the validity of our approach we also calculate Brs of these reactions by using 331 model and finding them consistent with previously available values of the same model.
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