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Abstract
Abstract We derive generic predictions at hadron colliders from the large forward- backward asymmetry observed at the Tevatron, assuming the latter arises from heavy new physics beyond the Standard Model. We use an effective field theory approach to characterize the associated unknown dynamics. By fitting the Tevatron $ t\overline{t} $ data we derive constraints on the form of the new physics. Furthermore, we show that heavy new physics explaining the Tevatron data generically enhances at high invariant masses both the top pair production cross section and the charge asymmetry at the LHC. This enhancement can be within the sensitivity of the 8TeV run, such that the 2012 LHC data should be able to exclude a large class of models of heavy new physics or provide hints for its presence. The same new physics implies a contribution to the forward-backward asymmetry in bottom pair production at low invariant masses of order a permil at most.
Highlights
The 7 TeV LHC run has already provided preliminary measurements of these two observables
We derive generic predictions at hadron colliders from the large forwardbackward asymmetry observed at the Tevatron, assuming the latter arises from heavy new physics beyond the Standard Model
We show that heavy new physics explaining the Tevatron data generically enhances at high invariant masses both the top pair production cross section and the charge asymmetry at the LHC
Summary
In order to collectively describe heavy NP, we use a set of effective operators, under the assumptions that the scale Λ characterizing NP is significantly higher than the top pair invariant mass in the relevant measurements. There are chromomagnetic dipole operators involving the gluon field strength which contribute to uu → tt Their contribution at O(1/Λ4) is suppressed by at least (mt/Λ) compared to their dominant 1/Λ2 effects [15]. Dimension eight operators interfering with the SM are subdominant compared to the effects that we consider when the NP couplings are sizable at the scale where NP is on-shell [15], as is typically required by the large AtFtB measurement. See [14, 15]
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