Upper Limit on the Decay K+ --> e+ nu mu+ mu-

TL;DR

This paper establishes an upper limit on the branching ratio of the decay K+ --> e+ nu mu+ mu-, providing experimental constraints consistent with theoretical predictions from chiral perturbation theory.

Contribution

It provides the first experimental upper limit on the decay K+ --> e+ nu mu+ mu-, testing theoretical models.

Findings

Branching ratio upper limit set at 5.0 x 10^{-7}

Results are consistent with chiral perturbation theory

Supports existing theoretical predictions

Abstract

An upper limit on the branching ratio for the decay K+ --> e+ nu mu+ mu- is set at 5.0 x 10^{-7} at 90% confidence level, consistent with predictions from chiral perturbation theory.