2011/02/28 by Kfir Blum, Cédric Delaunay, Oram Gedalia +5 · 1 citation
Physics and Astronomy · #Algorithm #Amplitude #Factorization #High-Energy Particle Collisions Research #Operator (biology) #Order (exchange) #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #hep-ph
paper · pdf · doi:10.1016/j.physletb.2011.07.020
published as Phys.Lett.B702:364-369,2011 · 7 pages, 2 figures and 2 tables. v2: References added. v3: Minor clarifications and modifications; matches published version
openalex publication_date 2011/07/22 · arxiv created 2011/07/27 · arxiv updated 2011/08/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
New physics at a high scale Λ can affect top-related observables at O ( 1 / Λ 2 ) via the interference of effective four quark operators with the SM amplitude. The ( u ¯ γ μ γ 5 T a u ) ( t ¯ γ μ γ 5 T a t ) operator modifies the large M t t ¯ forward–backward asymmetry, and can account for the recent CDF measurement. The ( u ¯ γ μ T a u ) ( t ¯ γ μ T a t ) operator modifies the differential cross section, but cannot enhance the cross section of ultra-massive boosted jets by more than 60%. The hint for a larger enhancement from a recent CDF measurement may not persist future experimental improvements, or may be a QCD effect that is not accounted for by leading order and matched Monte Carlo tools or naive factorization. If it comes from new physics, it may stem from new light states or an O ( 1 / Λ 4 ) new physics effect.