Search for the lepton-family-number nonconserving decay μ +→e +γ

M. Ahmed, J. F. Amann, D. Barlow, K. Black, R. D. Bolton, M. L. Brooks, S. Carius, Y. K. Chen, A. Chernyshev, H. M. Concannon, M. D. Cooper, P. S. Cooper, J. Crocker, J. R. Dittmann, M. Dzemidzic, A. Empl, R. J. Fisk, E. Fleet, W. Foreman, C. A. GagliardiD. Haim, A. Hallin, C. M. Hoffman, G. E. Hogan, E. B. Hughes, E. V. Hungerford, C. C.H. Jui, G. J. Kim, J. E. Knott, D. D. Koetke, T. Kozlowski, M. A. Kroupa, A. R. Kunselman, K. A. Lan, V. Laptev, D. Lee, F. Liu, R. W. Manweiler, R. Marshall, B. W. Mayes, R. E. Mischke, B. M.K. Nefkens, L. M. Nickerson, P. M. Nord, M. A. Oothoudt, J. N. Otis, R. Phelps, L. E. Piilonen, C. Pillai, L. Pinsky, M. W. Ritter, C. Smith, T. D.S. Stanislaus, K. M. Stantz, J. J. Szymanski, L. Tang, W. B. Tippens, R. E. Tribble, X. L. Tu, L. A. Van Ausdeln, W. H. Von Witch, D. Whitehouse, C. Wilkinson, B. Wright, S. C. Wright, Y. Zhang, K. O.H. Ziock

Research output: Contribution to journalArticle

99 Scopus citations


The MEGA experiment, which searched for the muon- and electron-number violating decay μ +→e + γ, is described. The spectrometer system, the calibrations, the data taking procedures, the data analysis, and the sensitivity of the experiment are discussed. The most stringent upper limit on the branching ratio, B(μ + →e + γ)<1.2×10 -11 with 90% confidence, is derived from a likelihood analysis.

Original languageEnglish (US)
Article number112002
JournalPhysical Review D
Issue number11
StatePublished - Dec 1 2002


ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Ahmed, M., Amann, J. F., Barlow, D., Black, K., Bolton, R. D., Brooks, M. L., Carius, S., Chen, Y. K., Chernyshev, A., Concannon, H. M., Cooper, M. D., Cooper, P. S., Crocker, J., Dittmann, J. R., Dzemidzic, M., Empl, A., Fisk, R. J., Fleet, E., Foreman, W., ... Ziock, K. O. H. (2002). Search for the lepton-family-number nonconserving decay μ +→e +γ. Physical Review D, 65(11), [112002].