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DETERMINATION OF THE STRONG COUPLING FROM HADRONIC TAU DECAYS USING RENORMALIZATION GROUP SUMMED PERTURBATION THEORY

Abbas, Gauhar and Ananthanarayan, B and Caprini, Irinel (2013) DETERMINATION OF THE STRONG COUPLING FROM HADRONIC TAU DECAYS USING RENORMALIZATION GROUP SUMMED PERTURBATION THEORY. In: MODERN PHYSICS LETTERS A, 28 (24).

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Official URL: http://dx.doi.org/10.1142/S0217732313600043

Abstract

Be the strong coupling constant alpha(s) from the tau hadronn width using a renormalization group summed (RGS) expansion of the QCD Adler lunction. The main theoretical uncertainty in the extraction of as is due to the manner in which renormalization group invariance is implemented, and the as yet uncalculated higher order terms in the QCD perturbative series. We show that new expansion exhibits good renormalization group improvement and the behavior of the series is similar to that of the standard RGS expansion. The value of the strong coupling in (MS) over bar scheme obtained with the RCS expansion is alpha(s) (M-tau(2)) = 0.338 +/- 0.010. The convergence properties of the new expansion can be improved by Bond transformation and analytic continuation in t he Bond plane. This is discussed elsewhere in these issues.

Item Type: Journal Article
Additional Information: Copyright of this article is belongs to WORLD SCIENTIFIC PUBL CO PTE LTD
Keywords: Strong coupling constant; tau-decays; renormalization-group
Department/Centre: Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Depositing User: Id for Latest eprints
Date Deposited: 30 Sep 2013 04:59
Last Modified: 30 Sep 2013 05:01
URI: http://eprints.iisc.ac.in/id/eprint/47346

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