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Stringent limits on top-quark compositeness from top anti-top production at the Tevatron and the LHC
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If the top quark is a composite state made out of some constituents, its interaction with the gluon will be modified. We introduce the leading effective operators that contribute to the radius and anomalous magnetic moment of the top quark and study their effect on the cross section for top anti-top production at the Tevatron and the LHC. Current measurements of the cross sections set a stringent limit on the scale of compositeness. This limit is comparable to similar limits obtained for light quarks and those from electroweak precision measurements. It can be used to constrain the parameter space of some composite Higgs models.
Forward citations
Cited by 2 Pith papers
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The trace distance between density matrices, a nifty tool in new-physics searches
Using the trace distance between Standard Model and new-physics density matrices gives the strongest quantum-information bounds on anomalous top and tau couplings, along with first measurements of magic in collider data.
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Top-quark Partial Compositeness beyond the effective field theory paradigm
In a simplified partial-compositeness model, energy-dependent gluon form factors suppress heavy top partner production by up to an order of magnitude and add a few-percent distortion to quark-initiated top pair production.
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