Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-06-02
JHEP 1108,088 (2011)
Physics
High Energy Physics
High Energy Physics - Phenomenology
v2: matches version published in JHEP
Scientific paper
10.1007/JHEP08(2011)088
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.
Haisch Ulrich
Westhoff Susanne
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