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

Ananthanarayan, B and Das, Diganta (2017) Optimal renormalization and the extraction of the strange quark mass from moments of the tau-decay spectral function. In: PHYSICAL REVIEW D, 94 (11).

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Official URL: http://dx.doi.org/10.1103/PhysRevD.94.116014

Abstract

We introduce an optimal renormalization group analysis pertinent to the analysis of polarization functions associated with the s-quark mass relevant in tau-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 m(s)(2 GeV) = 106.70 +/- 9.36 MeV and m(s)(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.

Item Type: Journal Article
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Additional Information: Copy right for this article belongs to the AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Department/Centre: Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited: 21 Jan 2017 08:44
Last Modified: 21 Jan 2017 08:44
URI: http://eprints.iisc.ernet.in/id/eprint/55955

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