QCD analysis of the tau hadronic width
Abstract
The total τ hadronic width can be accurately calculated using analyticity and the operator product expansion. The theoretical analysis of this observable is updated to include all available perturbative and non-perturbative corrections. Experimental measurements of τ decay rates are used to determine with high precision the QCD running coupling constant at the scale of the τ mass. The analysis is also used to study the present discrepancy between the experimental measurements of the leptonic branching fractions of the τ and its total lifetime.
- Publication:
-
Nuclear Physics B
- Pub Date:
- April 1992
- DOI:
- 10.1016/0550-3213(92)90267-F
- Bibcode:
- 1992NuPhB.373..581B