Top-quark forward-backward asymmetry in Randall-Sundrum models beyond the leading order. (English) Zbl 1294.81266
Summary: We calculate the \(t\overline{t}\) forward-backward asymmetry, \(A^{t}_{\text{FB}}\), in Randall-Sundrum (RS) models taking into account the dominant next-to-leading order (NLO) corrections in QCD. At Born level we include the exchange of Kaluza-Klein (KK) gluons and photons, the \(Z\) boson and its KK excitations, as well as the Higgs boson, whereas beyond the leading order (LO) we consider the interference of tree-level KK-gluon exchange with one-loop QCD box diagrams and the corresponding bremsstrahlungs corrections. We find that the strong suppression of LO effects, that arises due to the elementary nature and the mostly vector-like couplings of light quarks, is lifted at NLO after paying the price of an additional factor of \(\alpha_{s}/(4{\pi})\). In spite of this enhancement, the resulting RS corrections in \(A^{t}_{\text{FB}}\) remain marginal, leaving the predicted asymmetry SM-like. As our arguments are solely based on the smallness of the axial-vector couplings of light quarks to the strong sector, our findings are model-independent and apply to many scenarios of new physics that address the flavor problem via geometrical sequestering.
MSC:
| 81V05 | Strong interaction, including quantum chromodynamics |
| 83E15 | Kaluza-Klein and other higher-dimensional theories |
| 81T15 | Perturbative methods of renormalization applied to problems in quantum field theory |
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