New Limit for the Family-Number Non-conserving Decay mu+ to e+_gamma

MEGA Collaboration: M. L. Brooks , Y. K. Chen , M. D. Cooper , P. S. Cooper , M. Dzemidzic , A. Empl , C. A. Gagliardi , G. E. Hogan

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E. B. Hughes E. V. Hungerford C. C. H. Jui J. E. Knott D. D. Koetke M. A. Kroupa K. A. Lan R. Manweiler B. W. Mayes R. E. Mischke L. E. Piilonen T. D. S. Stanislaus K. M. Stantz J. J. Szymanski R. E. Tribble X. L. Tu L. A. Van Ausdeln W. H. von Witsch S. C. Wright K. O. H. Ziock

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classification ✦ hep-ex hep-phnucl-ex

keywords gammadecaylimitnon-conservingbeenbranchingconfidencee-11

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An experiment has been performed to search for the muon- and electron-number non-conserving decay mu+ to e+_gamma. The upper limit for the branching ratio to be GAMMA(mu+ to e+_gamma)/GAMMA(mu+ to e+_nu_nubar) < 1.2e-11 with 90% confidence.

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New Limit for the Family-Number Non-conserving Decay mu+ to e+_gamma

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