2008/03/31 by J. A. Aguilar–Saavedra, J. A. Aguilar-Saavedra · 145 citations
Physics and Astronomy · #Computer science #High-Energy Particle Collisions Research #Invariant (physics) #Large Hadron Collider #Mathematical physics #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Production (economics) #Quantum Chromodynamics and Particle Interactions #Quark #Top quark #Vertex (graph theory) #hep-ph
paper · pdf · doi:10.1016/j.nuclphysb.2008.06.013
published in Nuclear Physics B 804(1-2), 160-192 (Elsevier BV) · Latex 42 pages. Significant changes, final version to appear in NPB
arxiv created 2008/06/16 · openalex publication_date 2008/06/28 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/08
We investigate single top production in the presence of anomalous Wtb couplings. We explicitly show that, if these couplings arise from gauge invariant effective operators, the only relevant couplings for single top production and decay are the usual gammamu and sigmamu nu qnu terms, where q is the W boson momentum. This happens even in the single top production processes where the Wtb interaction involves off-shell top and/or bottom quarks. With this parameterisation for the Wtb vertex, we obtain expressions for the dependence on anomalous couplings of the single top cross sections, for (i) the t-channel process, performing a matching between tj and t bbar j production, where j is a light jet; (ii) s-channel t bbar production; (iii) associated tW- production, including the correction from tW- bbar. We use these expressions to estimate, with a fast detector simulation, the simultaneous limits which the measurement of single top cross sections at LHC will set on Vtb and possible anomalous couplings. Finally, a combination with top decay asymmetries and angular distributions is performed, showing how the limits can be improved when the latter are included in a global fit to Wtb couplings.