Massive color-octet bosons: bounds on effects in top-quark pair production
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 u...
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
19 August 2011
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| In: |
Journal of high energy physics
Year: 2011, Issue: 8 |
| ISSN: | 1029-8479 |
| DOI: | 10.1007/JHEP08(2011)088 |
| Online Access: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1007/JHEP08(2011)088 Verlag, kostenfrei, Volltext: https://link.springer.com/article/10.1007/JHEP08(2011)088 
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| Author Notes: | Ulrich Haisch and Susanne Westhoff |
| Summary: | 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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| Item Description: | Gesehen am 10.01.2018 |
| Physical Description: | Online Resource |
| ISSN: | 1029-8479 |
| DOI: | 10.1007/JHEP08(2011)088 |