Test of the running of {bold {alpha}}{sub {ital s}} in {bold {tau}} decays

Journal Article · Mon Apr 01 00:00:00 EST 1996 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.76.3061· OSTI ID:284729

Girone, M ^[1]; Neubert, M ^[2]

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1. Dipartimento di Fisica, Istituto Nazionale di Fisica Nucleare Sezione di Bari, 70126 Bari (Italy)
2. Theory Division, CERN, CH-1211 Geneva 23 (Switzerland)

The {tau} decay rate into hadrons of invariant mass smaller than {ital s}{sub 0}{gt}{Lambda}{sub QCD} can be calculated in QCD assuming global quark-hadron duality. It is shown that this assumption holds for {ital s}{sub 0}{approx_gt}0.7 GeV{sup 2}. From measurements of the hadronic mass distribution, the running coupling constant {alpha}{sub {ital s}}({ital s}{sub 0}) is extracted in the range 0.7 GeV{sup 2}{lt}{ital s}{sub 0}{lt}{ital m}{sub {tau}}{sup 2}. At {ital s}{sub 0}={ital m}{sub {tau}}{sup 2}, the result is {alpha}{sub {ital s}}({ital m}{sub {tau}}{sup 2})=0.329{plus_minus}0.030. The running of {alpha}{sub {ital s}} is in good agreement with the QCD prediction. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 284729
• Journal Information: Physical Review Letters, Vol. 76, Issue 17; Other Information: PBD: Apr 1996
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
TAU PARTICLES
SEMILEPTONIC DECAY
COUPLING
TESTING
QUANTUM CHROMODYNAMICS
QUARKS
HADRONS
DUALITY
MASS DISTRIBUTION