Experimental upper limits on branching fractions for unexpected decay modes of the tau lepton

Journal Article · Tue Jun 01 00:00:00 EDT 1982 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.25.2869· OSTI ID:5196271

Hayes, K G; Perl, M L; Alam, M S; Boyarski, A M; Breidenbach, M; Burke, D L; Dorenbosch, J; Dorfan, J M; Feldman, G J; Franklin, M E.B.; Hanson, G; Himel, T; Hitlin, D G; Hollebeek, R J; Innes, W R; Jaros, J A; Jenni, P; Larsen, R R; Lueth, V; Richter, B ; Roussarie, A; Scharre, D L; Schindler, R H; Schwitters, R F; Siegrist, J L; Taureg, H; Tonutti, M; Vidal, R A; Weiss, J M; Zaccone, H; Abrams, G S; Blocker, C A; Blondel, A; Carithers, W C; Chinowsky, W; Coles, M W; Cooper, S; Dieterle, W E; Dillon, J B; Eaton, M W; Gidal, G; Goldhaber, G; Johnson, A D; Kadyk, J A; Lankford, A J; Levi, M; Millikan, R E; Nelson, M E; Pang, C Y; Patrick, J F; Strait, J; Trilling, G H; Vella, E N; Videau, I

Searches for 12 neutrinoless decay modes of the tau which violate lepton-number conservation have been made using the reaction e/sup +/e/sup -/..-->..tau/sup +/tau/sup -/. No evidence for lepton-number violation is observed, and we have set upper limits (90% C.L.) on the branching ratio for each decay mode. The branching-ratio limits on the radiative decays tau..--> mu gamma.. and tau..-->..e..gamma.. are 0.055 and 0.064, respectively. For the charged lepton decays tau..-->..eee, tau..-->..e..mu mu.., tau..--> mu..ee, and tau..--> mu mu mu.., the branching ratio limits are 0.040, 0.033, 0.044, and 0.049%, respectively. Upper limits on the branching ratios for the following charged lepton-neutral hadron decays are: tau..-->..erho/sup 0/ (0.037%), tau..--> mu..rho/sup 0/ (0.044%), tau..-->..eK/sup 0/ (0.13%), tau..--> mu..K/sup 0/ (0.10%), tau..-->..e..pi../sup 0/ (0.21%), and tau..--> mu pi../sup 0/ (0.082%). We also use these data to search for the pair production in e/sup +/e/sup -/ annihilation of some unconventional particles with masses less than about 3 GeV/c/sup 2/.

• Research Organization: Stanford Linear Accelerator Center, Stanford University, Stanford, California 94305
• DOE Contract Number: W-7405-ENG-48; AC03-76SF00515
• OSTI ID: 5196271
• Journal Information: Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 25:11; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
645102 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
BASIC INTERACTIONS
BRANCHING RATIO
DECAY
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC PARTICLE DECAY
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
FERMIONS
HEAVY LEPTONS
INTERACTIONS
INVARIANCE PRINCIPLES
LEPTON NUMBER
LEPTON-LEPTON INTERACTIONS
LEPTONS
PARTICLE DECAY
PARTICLE INTERACTIONS
POSTULATED PARTICLES
RADIATIVE DECAY
TAU PARTICLES
WEAK PARTICLE DECAY