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Massive color-octet bosons: bounds on effects in top-quark pair production

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Abstract

A critical survey of the existing direct and indirect constraints on massive spin-one color octets is presented. Since such new degrees of freedom appear in any extension of the color gauge group to a product of at least two SU(3) factors, we keep our discussion as independent as possible from the underlying theory. In the framework of scenarios that involve flavor non-universal couplings, we show that excessive flavor-changing neutral currents can be avoided by a suitable alignment in flavor space. Constraints from electroweak precision observables and direct production at hadron colliders still leave space for sizable new-physics effects in top-quark pair production, in particular a large forward-backward asymmetry. In this context, we derive a model-independent upper bound on the asymmetry that applies whenever top-antitop production receives the dominant corrections from s-channel exchange of a new single color-octet resonance.

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Authors and Affiliations

  1. Institut für Physik (THEP), Johannes Gutenberg-Universität, Staudingerweg 7, D-55099, Mainz, Germany

    Ulrich Haisch & Susanne Westhoff

  2. Helmholtz-Institut Mainz, Johannes Gutenberg-Universität, Staudingerweg 7, D-55099, Mainz, Germany

    Susanne Westhoff

  3. Rudolf Peierls Centre for Theoretical Physics, University of Oxford, 1 Keble Road, Oxford, OX1 3NP, U.K.

    Ulrich Haisch

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  1. Ulrich Haisch
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Haisch, U., Westhoff, S. Massive color-octet bosons: bounds on effects in top-quark pair production. J. High Energ. Phys. 2011, 88 (2011). https://doi.org/10.1007/JHEP08(2011)088

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