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

MEGA Collaboration; Brooks, M. L.; Chen, Y. K.; Cooper, M. D.; Cooper, P. S.; Dzemidzic, M.; Empl, A.; Gagliardi, C. A.; Hogan, G. E.; Hughes, E. B.; Hungerford, E. V.; Jui, C. C. H.; Knott, J. E.; Koetke, D. D.; Lan, M. A. Kroupa K. A.; Manweiler, R.; Mayes, B. W.; Mischke, R. E.; Piilonen, L. E.; Stanislaus, T. D. S.; Stantz, K. M.; Szymanski, J. J.; Tribble, R. E.; Tu, X. L.; Van Ausdeln, L. A.; von Witsch, W. H.; Wright, S. C.; Ziock, K. O. H.

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

Authors

Description

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.
4 pages, 3 figures, submitted to Phys. Rev. Lett