Mass Effects in Muon and Semileptonicb→cDecays

2008/03/06 by Alexey Pak, Andrzej Czarnecki
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.1103/physrevlett.100.241807

published as Phys.Rev.Lett.100:241807,2008 · 5 pages, 2 figures

arxiv created 2008/03/06 · openalex publication_date 2008/06/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

Quantum chromodynamics (QCD) effects in the semileptonic decay b\ensuremath→c\ensuremathℓ\ensuremathν are evaluated to the second order in the coupling constant, O(\ensuremathα_s²), and to several orders in the expansion in quark masses, m_c/m_b. Corrections are calculated for the total decay rate as well as for the first two moments of the lepton energy and the hadron system energy distributions. Translated into QED and applied to the muon decay, they decrease its predicted rate by \ensuremath-0.43 ppm.

Citations

• Two-loop bosonic electroweak corrections to the muon lifetime and MZ–MW interdependence
• Complete two loop electroweak contributions to the muon lifetime in the Standard Model
• Complete 2-Loop Quantum Electrodynamic Contributions to the Muon Lifetime in the Fermi Model
• Improved Measurement of the Positive-Muon Lifetime and Determination of the Fermi Constant