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, 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
TL;DR
This paper reports an experimental search for the rare mu+ to e+_gamma decay, setting a new upper limit on its branching ratio, which constrains theories beyond the Standard Model.
Contribution
The study establishes a new, more stringent upper limit for the mu+ to e+_gamma decay branching ratio, improving previous bounds and informing particle physics models.
Findings
Upper limit for branching ratio: < 1.2e-11 at 90% confidence
No evidence found for mu+ to e+_gamma decay
Constraints placed on theories predicting lepton flavor violation
Abstract
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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