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Progress report on recent rare muon decay experiments at the Los Alamos Meson Physics Facility

Conference ·
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A search has been performed for the decays ..mu.. ..-->.. eee, ..mu.. ..-->.. e..gamma.., and ..mu.. ..-->.. e..gamma gamma.. with a sensitivity in the branching ratios at the level of 10/sup -10/. The experiment used a separated, 26 MeV/c ..mu../sup +/ beam with an average intensity of 300kHz. A total of 2.2 x 10/sup 11/ muon decays were examined for the present result. The detector for the experiment is the Crystal Box, which consists of a cylindrical drift chamber surrounded by 396 NaI(T1) crystals. A layer of scintillation counters in front of the crystals provided timing for electrons and veto for photons. The energy resolution for electrons and photons is approx. 6% (FWHM). The position resolution of the drift chamber is 350 ..mu..m leading to a vertex cut with a rejection of 10/sup 3/ for ..mu.. ..-->.. eee. The timing resolution is approx. 300 ps the scintillators and approx. 1 ns from the crystals. No candidate for ..mu.. ..-->.. eee has been found, yielding an upper limit for the branching ratio of B/sub ..mu..3e/ < 1.3 x 10/sup -10/ (90% C.L.). 21 references.
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; AC02-76ER03539
OSTI ID:
6304484
Report Number(s):
LA-UR-84-2411; COO-3539-27; CONF-840789-4; ON: DE85001503
Country of Publication:
United States
Language:
English

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Related Subjects

645102* -- High Energy Physics-- Particle Interactions &amp; Properties-Experimental-- Weak Interactions &amp; Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BRANCHING RATIO
DECAY
DRIFT CHAMBERS
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
LEPTON NUMBER
LEPTONS
MASSLESS PARTICLES
MEASURING INSTRUMENTS
MULTIWIRE PROPORTIONAL CHAMBERS
MUON NUMBER
MUONS
MUONS PLUS
PARTICLE DECAY
PHOTONS
PROPORTIONAL COUNTERS
RADIATION DETECTORS
WEAK PARTICLE DECAY