Search for the rare decays ++()over-bar and + e+e()over-bar
PHYSICAL REVIEW D(2020)
Abstract
The rare pion decays pi(+)->mu(+)nu(mu)nu(nu) over bar and pi(+)-> e(+)nu(e)nu(nu) over bar are allowed in the Standard Model but highly suppressed. These decays were searched for using data from the PIENU experiment. A first result for Gamma( pi(+)->mu(+)nu(mu)nu(nu) over bar)/Gamma(pi(+)->mu(+)nu(mu)) < 8.6 x 10(-6) and an improved measurement Gamma ( pi(+)-> e(+)nu(e)nu(nu) over bar)/Gamma(pi(+)->mu(+)nu(mu) ) < 1.6 x 10(-7) were obtained.
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