1998/10/19 by Paolo Gambino, P. Gambino, A. Kwiatkowski +2
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1016/s0550-3213(98)00860-8
published as Nucl.Phys. B544 (1999) 532-556 · LaTeX, 29 pages, 6 postscript figures included
arxiv created 1998/10/19 · openalex publication_date 1999/04/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/29
We compute analytically the complete electroweak two-loop corrections to the B0- B0 mixing. These corrections fix the normalization of the electroweak coupling employed in the extraction of |Vtd| and reduce the theoretical uncertainty due to higher order electroweak effects from several percent to a few parts in a thousand. If the LO result is expressed in terms of Gμ or of the MS coupling g(MZ), the two-loop corrections are O(1%), the exact value depending on the mass of the Higgs boson. We discuss in detail the renormalization procedure and the scheme and scale dependence, and provide practical formulas for the numerical implementation of our results. We also consider the heavy top mass expansion and show that in the case at hand it converges very slowly.