Portrait of a colour octet

Abstract

New colour octets stand out among the new physics proposals to explain the anomalous forward-backward asymmetry measured in $t\bar{t}$ production by the CDF experiment at the Tevatron. We perform a fit to $t\bar{t}$ observables at the Tevatron and the LHC, including total cross sections, various asymmetries and the top polarisation and spin correlations, to find the most likely parameters of a light colour octet to be consistent with data. In particular, an octet coupling only to right-handed quarks gives a good fit to all measurements. The implications from the general fit are drawn in terms of predictions for top polarisation observables whose measurements are yet not very precise, and observables which simply have not been measured.

arXiv commentLATeX 17 pages. Added a fit for a heavy octet. Final version to appear in JHEP

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Cited by in corpus (7)

• Asymmetries in top quark pair production at hadron colliders
• Measurement of the charge asymmetry in top-quark pair production in the lepton-plus-jets final state in $pp$ collision data at $\sqrt{s}=8$ TeV with the ATLAS detector
• Measurement of the charge asymmetry in dileptonic decays of top quark pairs in $pp$ collisions at $\sqrt{s}=7$ TeV using the ATLAS detector
• Looking for bSM physics using top-quark polarization and decay-lepton kinematic asymmetries
• Measurements of the charge asymmetry in top-quark pair production in the dilepton final state at $\sqrt{s}=8$ TeV with the ATLAS detector
• Measurement of top quark polarization in $t\overline{t}$ lepton+jets final states
• Single lepton charge asymmetries in $t\bar{t}$ and $t\bar{t}\gamma$ production at the LHC