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Search for the rare decays ++()over-bar and + e+e()over-bar

A. Aguilar-Arevalo,M. Aoki,M. Blecher,D. Britton,D. vom Bruch,D. A. Bryman,S. Chen,J. Comfort,S. Cuen-Rochin,L. Doria,P. Gumplinger,A. Hussein,Y. Igarashi,S. Ito,S. Kettell,L. Kurchaninov,L. S. Littenberg,C. Malbrunot,R. E. Mischke,T. Numao,D. Protopopescu,A. Sher,T. Sullivan,D. Vavilov,D. Gorbunov,D. Kalashnikov

PHYSICAL REVIEW D（2020）

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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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