QCD predictions for the decay of the tau lepton
Journal Article
·
· Phys. Rev. Lett.; (United States)
The semileptonic decay rate of a heavy lepton is shown to be rigorously calculable by use of perturbative QCD. Even the tau lepton is heavy enough for the perturbative approximation to be accurate. The prediction for the ratio R = GAMMA(tau..-->..v/sub tau/+hadrons)GAMMA(tau..-->..v/sub tau/+e/sup -/+v-italic-bar/sub e/) is 3.29, with an uncertainty of about 1% due to the uncertainty in the ..lambda.. parameter of QCD. Nonperturbative corrections to this prediction are estimated to be on the order of 1%. More importantly, these corrections are shown to be negative because of a fortuitous cancellation of the leading contribution from the gluon condensate. The resulting prediction is significantly smaller than the present experimental result R = 3.65 +- 0.13
- Research Organization:
- Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208
- OSTI ID:
- 5160157
- Journal Information:
- Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 60:16; ISSN PRLTA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
645203* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Weak Interactions & Properties
645400 -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
DECAY
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
GLUONS
HADRONS
HEAVY LEPTONS
LEPTONS
MASS SPECTRA
MASSLESS PARTICLES
NEUTRINOS
PARTICLE DECAY
PARTICLE PRODUCTION
PERTURBATION THEORY
POSTULATED PARTICLES
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
SEMILEPTONIC DECAY
SPECTRA
TAU NEUTRINOS
TAU PARTICLES
VACUUM STATES
WEAK PARTICLE DECAY
645400 -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
DECAY
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
GLUONS
HADRONS
HEAVY LEPTONS
LEPTONS
MASS SPECTRA
MASSLESS PARTICLES
NEUTRINOS
PARTICLE DECAY
PARTICLE PRODUCTION
PERTURBATION THEORY
POSTULATED PARTICLES
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
SEMILEPTONIC DECAY
SPECTRA
TAU NEUTRINOS
TAU PARTICLES
VACUUM STATES
WEAK PARTICLE DECAY