Recent results from the PLUTO and DASP detectors at DORIS. [S wave, branching ratio, lifetime upper limit]

Conference · Sun Jan 01 04:00:00 EST 1978 · AIP (Am. Inst. Phys.) Conf. Proc.; (United States)

OSTI ID:6507100

Timm, U

Decays of the heavy lepton tau were now observed in e/sup +/e/sup -/-collisions at the energy of the psi'-resonance, which results in an improved mass determination M/sub tau/ = 1,087 +- 0.020 GeV. For the tau-lifetime a new upper limit of tau/sub tau/ less than or equal to 3.5 10/sup -12/ sec is given. The evidence for the decay tau ..-->.. ..nu pi.. anti p was strengthened, and the ..pi..p-system is found to be in an S-wave state with j/sup P/ = 1/sup +/, providing the axial vector component in the leptonic coupling of the tau to hadrons. The branching ratio is given with BR(tau/sup -/ ..-->.. ..nu pi../sup -/rho/sup 0/) = 0.050 +- 0.015. The total hadronic cross section agrees within errors with the quark sum rule including QCD-corrections. The production and decay distributions of the decay J/psi ..-->.. f/sup 0/..gamma.. were measured and found to agree well with a QCD calculation based on the exchange of two gluons. 30 references.

• Research Organization: Deutsches Elektronen-Synchrotron, Hamburg, Germany
• OSTI ID: 6507100
• Report Number(s): CONF-780338-
• Conference Information: Journal Name: AIP (Am. Inst. Phys.) Conf. Proc.; (United States) Journal Volume: 45
• 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
645104 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Meson-Induced Interactions-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BOSONS
BRANCHING RATIO
COUPLING
CROSS SECTIONS
DECAY
DISTRIBUTION
ELECTROMAGNETIC PARTICLE DECAY
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
EQUATIONS
FERMIONS
FIELD THEORIES
GLUON MODEL
HADRONS
HEAVY LEPTONS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LEPTONS
LIFETIME
MASS
MATHEMATICAL MODELS
MESON RESONANCES
MESONS
PARITY
PARTIAL WAVES
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PROPERTIES
PIONS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
PSI RESONANCES
PSI-3105 RESONANCES
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARKS
RADIATIVE DECAY
RESONANCE PARTICLES
RHO-765 RESONANCES
S WAVES
SEMILEPTONIC DECAY
SPIN
SUM RULES
TAU PARTICLES
TENSORS
TOTAL CROSS SECTIONS
VECTOR MESONS
VECTORS
WEAK PARTICLE DECAY