Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1993-04-07
Phys.Rev.Lett. 71 (1993) 1316-1319
Physics
High Energy Physics
High Energy Physics - Phenomenology
LateX, 11 pages, no figures, NUHEP-TH-93-5
Scientific paper
10.1103/PhysRevLett.71.1316
The spin asymmetry parameter $A_\tau$ characterizing the angular distribution of the total hadron momentum in the decay of a polarized tau can be calculated rigorously using perturbative QCD and the operator product expansion. Perturbative QCD corrections to the free quark result $A_\tau = 1/3$ can be expressed as a power series in $\alpha_s(M_\tau)$ and nonperturbative QCD corrections can be expanded systematically in powers of $1/M_\tau^2$. The QCD prediction is $A_\tau = 0.41 \pm 0.02$. In the decay of a high energy tau into hadrons, the value of the hadronic energy distribution $dR_\tau/dz$ evaluated at the maximum hadronic energy fraction $z = 1$ can also be calculated rigorously from QCD.
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