Measurement of alpha-s from tau decays

We present measurements of spectral moments extracted from the invariant mass distributions of the final states of hadronic τ decay products recorded in the CLEO detector. From a fit of theoretical predictions to the measurements of spectral moments and the total hadronic decay width of the τ, we determine the strong coupling constant and a set of non-perturbative QCD parameters. The strong coupling constant is measured to be α s ( m τ ) = 0.306 ± 0.024, which when extrapolated to the Z mass, yields α s ( M z ) = 0.114 ± 0.003.

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
tau: electroproduction
electroproduction: tau
tau: pair production
pair production: tau
tau: semileptonic decay
semileptonic decay: tau

References(16)

Figures(0)

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