Implications of the CDF tt̄ forward-backward asymmetry for boosted top physics

Kfir Blum, Cédric Delaunay, Oram Gedalia, Yonit Hochberg, Seung Joon Lee, Yosef Nir, Gilad Perez, Yotam Soreq

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Abstract

New physics at a high scale λ can affect top-related observables at O(1/λ2) via the interference of effective four quark operators with the SM amplitude. The (ūγμγ5Tau)(t̄γμγ5Tat) operator modifies the large Mtt̄ forward-backward asymmetry, and can account for the recent CDF measurement. The (ūγμTau)(t̄γμTat) 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/λ4) new physics effect.

Original languageEnglish
Pages (from-to)364-369
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume702
Issue number5
DOIs
Publication statusPublished - 2011 Aug 26
Externally publishedYes

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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