Optimal renormalization and the extraction of the strange quark mass from moments of the $\tau$-decay spectral function

We introduce an optimal renormalization group analysis pertinent to the analysis of polarization functions associated with the s-quark mass relevant in τ-decay. The technique is based on the renormalization group invariance constraints which lead to closed form summation of all the leading and next-to-leading logarithms at each order in perturbation theory. The new perturbation series exhibits reduced sensitivity to the renormalization scale and improved behavior in the complex plane along the integration contour. Using improved experimental and theory inputs, we have extracted the value of the strange quark mass ms(2 GeV)=106.70±9.36 MeV and ms(2 GeV)=74.47±7.77 MeV from presently available ALEPH and OPAL data respectively. These determinations are in agreement with the determinations in other phenomenological methods and from the lattice.

Note:

12 pages, 4 tables, 7 figures, v2 corresponds to version to appear in Physical Review D

quark: mass
renormalization group: invariance
scale: renormalization
tau: decay
spectral representation
polarization
strange particle: mass
lattice field theory
higher-order: 0
higher-order: 1

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Figures(14)

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Optimal renormalization and the extraction of the strange quark mass from moments of the τ\tauτ-decay spectral function

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Optimal renormalization and the extraction of the strange quark mass from moments of the $\tau$ -decay spectral function