Comment on measuring the t-tbar forward-backward asymmetry at ATLAS and CMS

Abstract

We suggest a new possibility for ATLAS and CMS to explore the t-tbar forward-backward asymmetry measured at the Tevatron, by attempting to reconstruct t-tbar events, with one of the tops decaying semileptonically in the central region (|η| < 2.5) and the other decaying hadronically in the forward region (|η| > 2.5). For several models which give comparable Tevatron signals, we study the charge asymmetry at the LHC as a function of cuts on |η| and on the t-tbar invariant mass, m_{t-tbar}. We show that there is an interesting complementarity between cuts on |η| and m_{t-tbar} to suppress the dominant and symmetric gg -> t-tbar rate, and different combinations of cuts enhance the distinguishing power between models. This complementarity is likely to hold in other new physics scenarios as well, which affect the t-tbar cross section, so it motivates extending t-tbar reconstruction to higher |η|.

6 pages, 3 figures, 3 tables, v2: to match version appearing in PRD, resolution in figures improved

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Cited by in corpus (11)

• Top quark and leptonic charge asymmetries for the Tevatron and LHC
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• Flavor Symmetric Sectors and Collider Physics
• Testing new physics models by top charge asymmetry and polarization at the LHC
• Light axigluon explanation of the Tevatron ttbar asymmetry and multijet signals at the LHC
• Top quark forward-backward asymmetry and charge asymmetry in left-right twin Higgs model
• Top Pair Forward-Backward Asymmetry from Loops of New Strongly Coupled Quarks
• Improving top quark induced charge asymmetries at the LHC using ttbar transverse momentum
• Enhancing the sensitivity to New Physics in the top-antitop invariant mass distribution
• Top-Quark Asymmetry -- A New Physics Overview
• Top-antitop resonance searches beyond 1 TeV