Next-to-leading order QCD corrections to the top quark decay via the flavor-changing neutral-current operators with mixing effects

2010/04/19 by Jia Zhang, Jia Jun Zhang, Chong Sheng Li +5
Physics and Astronomy · #Branching fraction #High-Energy Particle Collisions Research #Mixing (physics) #Nuclear physics #Order (exchange) #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Quark #hep-ex #hep-ph

paper · pdf · doi:10.1103/physrevd.82.073005

published as Phys.Rev.D82:073005,2010 · 21 pages, 12 figures

arxiv created 2010/04/19 · openalex publication_date 2010/10/12 · arxiv updated 2015/03/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Detailed calculations of the complete O(\ensuremathα_s) corrections to the top-quark decay widths \ensuremathΓ(t\ensuremath→q+V) with V=g, \ensuremathγ, Z, and q=u, c are presented. Besides describing in detail the calculations in our previous work [Phys. Rev. Lett. 102, 072001 (2009)], we also include the mixing effects of the flavor-changing neutral-current operators for t\ensuremath→q+\ensuremathγ and t\ensuremath→q+Z, which were not considered previously. We show that the mixing effects can either be large or small depending on the values of various anomalous couplings and thereby increase or decrease the branching ratios for t\ensuremath→q+\ensuremathγ and t\ensuremath→q+Z.

Citations

• Next-to-Leading-Order QCD Corrections to the Top-Quark Decay via Model-Independent Flavor-Changing Neutral-Current Couplings
• Review of Particle Physics
• Top-quark decay via the anomalous couplingt¯cγat hadron colliders
• Threshold resummation effects in direct top quark production at hadron colliders
• Search for Top-Quark Production via Flavor-Changing Neutral Currents inW+1Jet Events at CDF