Measurement of the strong coupling constant using T decays

Buskulic, D. and Finch, Alexander (1993) Measurement of the strong coupling constant using T decays. Physics Letters B, 307 (1-2). pp. 209-220. ISSN 0370-2693

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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(mτ2) = 0.330±0.046, evolved to the Z mass yields αs(MZ2) = 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%.

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Journal Article
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Physics Letters B
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08 May 2013 14:15
Last Modified:
21 Nov 2022 23:42