New results for rare muon decays

Conference · Wed Jan 01 04:00:00 EST 1986

DOI:https://doi.org/10.1007/978-3-642-71689-8_159· OSTI ID:5657064

Mischke, R E; Bolton, R D; Bowman, J D; Cooper, M D; Frank, J S; Hallin, A L; Heusi, P A; Hoffman, C M; Hogan, G E; Mariam, F G

Branching-ratio limits obtained with the Crystal Box detector are presented for the rare muon decays ..mu.. ..-->.. eee, ..mu.. ..-->.. e..gamma.., and ..mu.. ..-->.. e..gamma gamma... These decays, which violate the conservation of separate lepton-family numbers, are expected to occur in many extensions to the standard model. We found no candidates for the decay ..mu.. ..-->.. eee, yielding an upper limit for the branching ratio of B/sub ..mu..3e/ < 3.1 x 10/sup -11/ (90% C.L.). A maximum-likelihood analysis of the ..mu.. ..-->.. e..gamma.. candidates yields an upper limit of B/sub ..mu..e..gamma../ < 4.9 x 10/sup -11/ and an analogous analysis of ..mu.. ..-->.. e..gamma gamma.. candidates gives an upper limit of B/sub ..mu..e..gamma gamma../ < 7.2 x 10/sup -11/. These results strengthen the constraints on models that allow transitions between lepton families.

• Research Organization: Los Alamos National Lab., NM (USA); Stanford Univ., CA (USA); Chicago Univ., IL (USA); Temple Univ., Philadelphia, PA (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5657064
• Report Number(s): LA-UR-86-2283; CONF-860741-6; ON: DE86012419
• Country of Publication: United States
• Language: English

Related Subjects

645102* -- High Energy Physics-- Particle Interactions &amp; Properties-Experimental-- Weak Interactions &amp; Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
DATA
DECAY
DIAGRAMS
DRIFT CHAMBERS
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
FERMIONS
INFORMATION
LEPTONS
LIMITING VALUES
MEASURING INSTRUMENTS
MULTIWIRE PROPORTIONAL CHAMBERS
MUONS
NUMERICAL DATA
PARTICLE DECAY
PROPORTIONAL COUNTERS
RADIATION DETECTORS
RADIATIVE DECAY
SCATTERPLOTS
WEAK PARTICLE DECAY