Search for a nearly degenerate lepton doublet ( L sup minus , L sup 0 )

Journal Article · Sun Jul 01 00:00:00 EDT 1990 · Physical Review, D (Particles Fields); (USA)

DOI:https://doi.org/10.1103/PhysRevD.42.1· OSTI ID:6694802

Riles, K; Perl, M L; Barklow, T; Boyarski, A; Burchat, P R; Burke, D L; Dorfan, J M; Feldman, G J; Gladney, L; Hanson, G; Hayes, K; Hollebeek, R J; Innes, W R; Jaros, J A; Karlen, D; Klein, S R; Lankford, A J; Larsen, R R; LeClaire, B W; Lockyer, N S ; Lueth, V; Ong, R A; Richter, B; Yelton, J M ^[1]; Abrams, G; Amidei, D; Baden, A R; Boyer, J; Butler, F; Gidal, G; Gold, M S; Goldhaber, G; Golding, L; Haggerty, J; Herrup, D; Juricic, I; Kadyk, J A; Levi, M E; Nelson, M E; Rowson, P C; Schellman, H; Schmidke, W B; Sheldon, P D; Trilling, G H; Wood, D R ^[2]; Schaad, T ^[3]

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1. Stanford Linear Accelerator Center, Stanford University, Stanford, CA (USA)
2. Lawrence Berkeley Laboratory Department of Physics, University of California, Berkeley, CA (USA)
3. Department of Physics, Harvard University, Cambridge, MA (USA)

We have searched for a heavy charged lepton with an associated neutrino of nearly the same mass in {ital e}{sup +}{ital e}{sup {minus}} annihilation data taken with the Mark II detector at a center-of-mass energy of 29 GeV. In order to suppress contamination from conventional two-photon reactions, this analysis uses a novel, radiative-tagging technique. Requiring the presence of an isolated, energetic photon allows a search for lepton doublets with mass splittings smaller than that previously accessible to experiment. No evidence for such a new lepton doublet has been found, enabling limits to be placed on allowed mass combinations. Mass splittings as low as 250--400 MeV/{ital c}{sup 2} are excluded for charged-lepton masses between 500 MeV/{ital c}{sup 2} and 10 GeV/{ital c}{sup 2}.

• DOE Contract Number: AC03-76SF00515
• OSTI ID: 6694802
• Journal Information: Physical Review, D (Particles Fields); (USA), Journal Name: Physical Review, D (Particles Fields); (USA) Vol. 42:1; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
BASIC INTERACTIONS
BRANCHING RATIO
CORRECTIONS
CROSS SECTIONS
ELECTROMAGNETIC INTERACTIONS
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY DENSITY
ENERGY RANGE
FERMIONS
GEV RANGE
GEV RANGE 10-100
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LEPTONS
LIFETIME
MASS DIFFERENCE
MASSLESS PARTICLES
NEUTRINOS
PARTICLE IDENTIFICATION
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PHOTONS
RADIATIVE CORRECTIONS
UNIVERSE