Recent results from the PLUTO and DASP detectors at DORIS. [S wave, branching ratio, lifetime upper limit]
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-; TRN: 79-005984
- Journal Information:
- AIP (Am. Inst. Phys.) Conf. Proc.; (United States), Vol. 45; Conference: 3. conference on new results in high energy physics, Nashville, TN, USA, 6 Mar 1978
- Country of Publication:
- United States
- Language:
- English
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ELECTRON-POSITRON INTERACTIONS
TOTAL CROSS SECTIONS
PSI RESONANCES
RADIATIVE DECAY
TAU PARTICLES
COUPLING
LIFETIME
MASS
SEMILEPTONIC DECAY
ANGULAR DISTRIBUTION
BRANCHING RATIO
GLUON MODEL
PARITY
PIONS
PSI-3105 RESONANCES
QUANTUM CHROMODYNAMICS
QUARKS
RHO-765 RESONANCES
S WAVES
SPIN
SUM RULES
VECTORS
ANGULAR MOMENTUM
BOSONS
CROSS SECTIONS
DECAY
DISTRIBUTION
ELECTROMAGNETIC PARTICLE DECAY
ELEMENTARY PARTICLES
EQUATIONS
FERMIONS
FIELD THEORIES
HADRONS
HEAVY LEPTONS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LEPTONS
MATHEMATICAL MODELS
MESON RESONANCES
MESONS
PARTIAL WAVES
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PROPERTIES
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
QUANTUM FIELD THEORY
RESONANCE PARTICLES
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