Polarized view of the top asymmetry

David Krohn, Tao Liu, Jessie Shelton, Lian Tao Wang

Research output: Contribution to journalArticle

Abstract

Recent experimental results from the CDF collaboration which study the top forward-backward asymmetry have strengthened the case that new physics is playing a role in tt̄ production. Here, we propose a set of measurements, built from the charged lepton kinematics in semileptonic and fully leptonic tt̄ events, designed to further probe the underlying causes of this asymmetry both at the Tevatron and at the LHC. Using a set of conservative reference models, we find that measurements of the charged lepton asymmetry, top polarization, and tt̄ spin correlation can establish the existence of new physics and distinguish between competing models both at the Tevatron and the LHC. At the Tevatron, discrimination between models is possible at the 3σ level. At the LHC, we demonstrate that a top forward-backward asymmetry can be established at 3σ in the first ∼5fb-1 of data and show how competing explanations can be further disentangled.

Original languageEnglish (US)
Article number074034
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume84
Issue number7
DOIs
StatePublished - Oct 27 2011

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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