The strong coupling constant is determined from the leptonic branching ratios, the lifetime, and the invariant mass distribution of the hadronic final state of the τ lepton, using data accumulated at LEP with the ALEPH detector. The strong coupling constant measurement, αs(mτ 2) = 0.330±0.046, evolved to the Z mass yields αs(MZ 2) = 0.188±0.005. The error includes experimental and theoretical uncertainties, the latter evaluated in the framework of the Shifman, Vainshtein and Zakharov (SVZ) approach. The method allows the non-perturbative contribution to the hadronic decay rate to be determined to be 0.3±0.5%.

Buskulic, D., Decamp, D., Goy, C., Lees, J., Minard, M., Mours, B., et al. (1993). Measurement of the strong coupling constant using τ decays. PHYSICS LETTERS. SECTION B, 307(1-2), 209-220 [10.1016/0370-2693(93)90212-Z].

Measurement of the strong coupling constant using τ decays

CARPINELLI, Massimo;
1993

Abstract

The strong coupling constant is determined from the leptonic branching ratios, the lifetime, and the invariant mass distribution of the hadronic final state of the τ lepton, using data accumulated at LEP with the ALEPH detector. The strong coupling constant measurement, αs(mτ 2) = 0.330±0.046, evolved to the Z mass yields αs(MZ 2) = 0.188±0.005. The error includes experimental and theoretical uncertainties, the latter evaluated in the framework of the Shifman, Vainshtein and Zakharov (SVZ) approach. The method allows the non-perturbative contribution to the hadronic decay rate to be determined to be 0.3±0.5%.
Articolo in rivista - Articolo scientifico
Physics
English
1993
307
1-2
209
220
none
Buskulic, D., Decamp, D., Goy, C., Lees, J., Minard, M., Mours, B., et al. (1993). Measurement of the strong coupling constant using τ decays. PHYSICS LETTERS. SECTION B, 307(1-2), 209-220 [10.1016/0370-2693(93)90212-Z].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/390425
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