A search for the rare decay. mu. /sup +/. -->. e/sup +/. gamma gamma

Technical Report · Sat Jan 31 23:00:00 EST 1987

DOI:https://doi.org/10.2172/6692832· OSTI ID:6692832

Grosnick, D P

An experimental search for the lepton-family number nonconserving decay, ..mu../sup +/ ..-->.. e/sup +/..gamma gamma.., has been conducted at the Clinton P. Anderson Meson Physics Facility (LAMPF) using the Crystal Box detector. The detector consists of a modular NaI(Tl) calorimeter, scintillator hodoscope, and a high-resolution, cylindrical drift chamber. It provides a large solid-angle for detecting three-body decays and has good resolutions in the time, position, and energy measurements to eliminate unwanted backgrounds. No evidence for ..mu../sup +/ ..-->.. e/sup +/..gamma gamma.. is found, giving an upper limit for the branching ratio of GAMMA(..mu.. ..-->.. e..gamma gamma..)/GAMMA(..mu.. ..-->.. e nu anti nu) less than or equal to 7.2 x 10/sup -11/ (90% C.L.). This result is an improvement of more than two orders of magnitude in the existing limit. 109 refs., 39 figs.

• Research Organization: Los Alamos National Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6692832
• Report Number(s): LA-10937-T; ON: DE87007721
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BRANCHING RATIO
CALIBRATION
DATA
DRIFT CHAMBERS
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
FERMIONS
HODOSCOPES
INFORMATION
LEPTONS
LIMITING VALUES
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MONTE CARLO METHOD
MULTIWIRE PROPORTIONAL CHAMBERS
MUONS
MUONS PLUS
NAI DETECTORS
NUMERICAL DATA
PARTICLE MODELS
PROPORTIONAL COUNTERS
RADIATION DETECTORS
RADIATIVE DECAY
SCINTILLATION COUNTERS
SHOWER COUNTERS
SOLID SCINTILLATION DETECTORS
STABILIZATION
STANDARD MODEL
UNIFIED GAUGE MODELS