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Review of new physics effects in \(t\bar{t}\) production

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Abstract

Both CDF and DØ report a forward–backward asymmetry in \(t\bar{t}\) production that is above the standard model prediction. We review new physics models that can give a large forward backward asymmetry in \(t\bar{t}\) production at the Tevatron and the constraints these models face from searches for dijet resonances and contact interactions, from flavor physics and the \(t\bar{t}\) cross section. Expected signals at the LHC are also reviewed.

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Notes

  1. Note that DØ also reports a leptonic asymmetry \(A_{\mathrm{FB}}^{l} = 0.152\pm 0.038^{+0.010}_{-0.013}\) to be compared to MC@NLO prediction of \(A_{\mathrm{FB}}^{l,\mathrm{SM}} = 0.021\pm0.001\) [3, 4].

  2. In the \(p\bar{p}\) frame, another recent approximate NNLO calculation [7] yields \(A_{\mathrm{FB}}^{\mathrm{SM}}=0.052^{+0.000}_{-0.006}\) with m t =173 GeV, to be compared with the CDF value of \(A_{\mathrm{FB}}^{\mathrm{incl}}= 0.150 \pm0.058 \pm0.024\) [1]. Both SM predictions build upon the recent progress in approximate NNLO calculations [8–13] and previously known NLO results [14–16].

  3. The most recent combination of CDF measurements [21] bears an even smaller error with \(\sigma^{\mathrm{incl}.}_{t\bar{t}} = (7.50\pm0.48)~\mathrm{pb}\), but was done assuming m t =172.5 GeV. Using the provided interpolation formulae in [17] yields \(\sigma_{t\bar{t}}^{\mathrm{SM}} = (6.75^{+0.08}_{-0.42})~\mathrm{pb}\) in the SM at approximate NNLO in QCD.

  4. For a general discussion on the physics beyond the SM analysis in the EFT approach and classification of all corresponding D=5,6 effective operators cf. [24–26].

  5. A discussion on reducing the overcomplete set of all possible EW symmetric operators can be found in [27, 29].

  6. For a general discussion of the CP violating phenomenology associated with operators in (2) cf. [32].

  7. Here we are neglecting the effects of light quark mass insertions.

  8. One immediate consequence of these bounds is that the boosted massive jet cross section as measured by CDF [50] cannot be accommodated by EFT contributions to \(t\bar{t}\) final states at \(\mathcal{O}(1/\varLambda^{2})\) [43].

  9. Note that this model does not implement an SU(2) flavor symmetry, therefore it has potential problems with both K–\(\bar{K}\) and D–\(\bar{D}\) mixings which can not be protected by simple U(1) d horizontal asymmetries [127].

  10. In the t-channel models, the \(A_{\mathrm{FB}}^{t\bar{t}}\) provided from top polarization will enhance (compete with) the one from Rutherford enhancement in the vector boson (scalar) models [61].

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Acknowledgements

We would like to thank Ulrich Haisch for his useful comments and careful reading of the manuscript. The work of J.F.K. and J.Z. is supported in part by the Slovenian Research Agency. J.S. is supported in part by the World Premier International Research Center Initiative (WPI initiative) MEXT, Japan and the Grant-in-Aid for scientific research (Young Scientists (B) 21740169) from Japan Society for the Promotion of Science (JSPS).

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  1. Institut “Jožef Stefan”, Jamova 39, 1000, Ljubljana, Slovenia

    Jernej F. Kamenik & Jure Zupan

  2. Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000, Ljubljana, Slovenia

    Jernej F. Kamenik & Jure Zupan

  3. Institute for the Physics and Mathematics of the Universe (IPMU), The University of Tokyo, Kashiwa, Chiba, 277-8568, Japan

    Jing Shu

  4. Department of Physics, University of Cincinnati, Cincinnati, OH, 45221, USA

    Jure Zupan

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Kamenik, J.F., Shu, J. & Zupan, J. Review of new physics effects in \(t\bar{t}\) production. Eur. Phys. J. C 72, 2102 (2012). https://doi.org/10.1140/epjc/s10052-012-2102-2

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