Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-02-15
Phys.Lett.B702:364-369,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, 2 figures and 2 tables. v2: References added. v3: Minor clarifications and modifications; matches published version
Scientific paper
10.1016/j.physletb.2011.07.020
New physics at a high scale Lambda can affect top-related observables at O(1/Lambda^2) via the interference of effective four quark operators with the SM amplitude. The (\bar{u} gamma_mu gamma^5 T^a u)(\bar{t} gamma^mu gamma^5 T^a t) operator modifies the large M_{t\bar{t}} forward-backward asymmetry, and can account for the recent CDF measurement. The (\bar{u} gamma_mu T^a u)(\bar{t} gamma^mu 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/Lambda^4) new physics effect.
Blum Kfir
Delaunay Cedric
Gedalia Oram
Hochberg Yonit
Lee Seung J.
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