Search for muon-electron and muon-positron conversion

Journal Article · Sat Oct 01 04:00:00 EDT 1988 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.38.2102· OSTI ID:7065204

Ahmad, S; Azuelos, G; Blecher, M; Bryman, D A; Burnham, R A; Clifford, E T.H.; Depommier, P; Dixit, M S; Gotow, K; Hargrove, C K; others, and

Limits on the lepton-flavor-violating reactions ..mu../sup -/+Z..-->..e/sup -/+Z and ..mu../sup -/+Z..-->..e/sup +/+(Z-2), muon-electron and muon-positron conversion, have been obtained from a search performed at TRIUMF using a time-projection chamber. Upper limits (90% C.L.) for the branching ratios compared to ordinary muon capture for a titanium target are R: (Ti) = GAMMA(..mu../sup -/Ti..-->..e/sup -/Ti)/GAMMA(..mu../sup -/Ti capture)<4.6 x 10/sup -12/ and R/sub +/(Ti) = GAMMA(..mu../sup -/Ti..-->..e/sup +/Ca*)/GAMMA(..mu../sup -/Ti capture)<.1.7 x 10/sup -10/ A smaller data set obtained using a lead target yielded R/sub -/(Pb)<4.9 x 10/sup -10/. The implications of these results for extensions of the standard model which allow lepton-flavor violation are discussed.

• Research Organization: TRIUMF and University of Victoria, Victoria, British Columbia, Canada V8W 2Y2 TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3 Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 University of British Columbia, Vancouver, British Columbia, Canada V6T 2A6
• OSTI ID: 7065204
• Journal Information: Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 38:7; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645102* -- High Energy Physics-- Particle Interactions &amp; Properties-Experimental-- Weak Interactions &amp; Properties
651520 -- Nuclear Properties &amp; Reactions
A=39-58
Experimental
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BRANCHING RATIO
CAPTURE
CHARGED-PARTICLE REACTIONS
CYCLIC ACCELERATORS
CYCLOTRONS
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
INELASTIC SCATTERING
ISOCHRONOUS CYCLOTRONS
LEAD 208 TARGET
LEPTON NUMBER
LEPTON REACTIONS
LEPTONS
MUON REACTIONS
NUCLEAR REACTIONS
POSITRONS
SCATTERING
TARGETS
TITANIUM 47 TARGET
TRIUMF CYCLOTRON