Top-quark forward-backward asymmetry in Randall-Sundrum models beyond the leading order

Journal article

We calculate the tt̄ forward-backward asymmetry, A FBt, 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 α s/(4π). In spite of this enhancement, the resulting RS corrections in A FBt 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. © 2010 SISSA.

Authors: Bauer, M; Goertz, F; Haisch, U; Pfoh, T; Westhoff, S

• Publication status: Published
• Journal: JOURNAL OF HIGH ENERGY PHYSICS
• Volume: 2010
• Issue: 11
• Publication date: 2010-11-01
• DOI: 10.1007/JHEP11(2010)039
• EISSN: 1029-8479
• ISSN: 1029-8479
• Language: English
• Keywords: Phenomenology of Field Theories in Higher Dimensions