Tevatron Top $A_{FB}$ Versus LHC Top Physics

Abstract

We carry out a comprehensive analysis of models for top A_{FB} at CDF in light of new top data arriving from the LHC. We begin with a careful Tevatron analysis, considering in general which sets of effective vertices give rise to a large forward-backward asymmetry while suppressing the contribution to the total t tbar cross-section. We show on general grounds that scalar models struggle to produce sufficient asymmetries consistent with CDF observations, while vector models can produce a large asymmetry with a less significant tension in the total cross-section and $t\bar{t}$ invariant mass distribution at the Tevatron. We examine the essential observables of these models for top physics at LHC7 with 1 fb^{-1} of data, including the total cross-section, invariant mass distribution and number of additional jets in t tbar events. In the case of t-channel mediators, the LHC total cross-section places a strong constraint on light mediators, while the Tevatron invariant mass distributions place strong constraints on heavy mediators that are able to produce the asymmetry. Heavy axigluons are becoming increasingly squeezed by LHC7 t tbar and dijet resonance searches. We conclude that LHC7 top analyses are rapidly closing the window for viable models of the CDF top A_{FB}.

51 pages, 25 figures, 7 tables; v2: refs. added, typos fixed, figures improved, notes added

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• Light axigluon explanation of the Tevatron ttbar asymmetry and multijet signals at the LHC
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• Top A_FB at the Tevatron vs. charge asymmetry at the LHC in chiral U(1) flavor models with flavored Higgs doublets
• Forward Tevatron Tops and Backward LHC Tops with Associates
• Diagnosing the top-quark angular asymmetry using LHC intrinsic charge asymmetries
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• Same-sign Tops: A Powerful Diagnostic Test for Models of New Physics
• Interpretations and Implications of the Top Quark Rapidity Asymmetries $A_{FB}^t$ and $A_{FB}^{\ell }$
• Ultraviolet Completions of Axigluon Models and Their Phenomenological Consequences
• Stealth QCD-like Strong Interactions and the t-tbar Asymmetry
• TASI Lectures on Flavor Physics
• Top-Quark Asymmetry -- A New Physics Overview
• Tevatron Top Quark Forward-Backward Asymmetry -- Implications for Same-sign Top Quark Pair Production
• Parity Nonconservation in Strong Interactions
• Top-quark forward-backward asymmetry from a color-octet t-channel resonance
• LHC Dijet Signals in New Physics Models for Top Forward-Backward Asymmetry
• Impact of Torsion Space-Time on $t\bar{t}$ observables at Hadron Colliders
• LHC and Tevatron constraints on a W' model interpretation of the top quark forward-backward asymmetry