Improved Calculation of Electroweak Radiative Corrections and the Value of V_ud
High Energy Physics - Phenomenology
2009-11-11 v2
Abstract
A new method for computing hadronic effects on electroweak radiative corrections to low-energy weak interaction semileptonic processes is described. It employs high order perturbative QCD results originally derived for the Bjorken sum rule along with a large N QCD-motivated interpolating function that matches long and short-distance loop contributions. Applying this approach to the extraction of the CKM matrix element V_ud from superallowed nuclear beta decays reduces the theoretical loop uncertainty by about a factor of 2 and gives V_ud = 0.97377(11)(15)(19). Implications for CKM unitarity are briefly discussed.
Cite
@article{arxiv.hep-ph/0510099,
title = {Improved Calculation of Electroweak Radiative Corrections and the Value of V_ud},
author = {William J. Marciano and Alberto Sirlin},
journal= {arXiv preprint arXiv:hep-ph/0510099},
year = {2009}
}
Comments
12 pages, no figures. Ref. [8] corrected