Improved Calculation of Electroweak Radiative Corrections and the Value of V_ud

Details Improved Calculation of Electroweak Radiative Corrections and the Value of V_ud Improved Calculation of Electroweak Radiative Corrections and the Value of V_ud

2005-10-07

arxiv.org/abs/hep-ph/0510099v2

Phys.Rev.Lett. 96 (2006) 032002

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, no figures. Ref. [8] corrected

Scientific paper

10.1103/PhysRevLett.96.032002

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.

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