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High Energy Physics - Phenomenology

arXiv:hep-ph/0510099 (hep-ph)
[Submitted on 7 Oct 2005 (v1), last revised 18 Oct 2005 (this version, v2)]

Title:Improved Calculation of Electroweak Radiative Corrections and the Value of V_ud

Authors:William J. Marciano, Alberto Sirlin
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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.
Comments: 12 pages, no figures. Ref. [8] corrected
Subjects: High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:hep-ph/0510099
  (or arXiv:hep-ph/0510099v2 for this version)
  https://doi.org/10.48550/arXiv.hep-ph/0510099
Journal reference: Phys.Rev.Lett. 96 (2006) 032002
Related DOI: https://doi.org/10.1103/PhysRevLett.96.032002

Submission history

From: Tadas Krupovnickas [view email]
[v1] Fri, 7 Oct 2005 17:29:15 UTC (13 KB)
[v2] Tue, 18 Oct 2005 17:41:59 UTC (13 KB)
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