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Constraining the intrinsic structure of top-quarks

2013; Elsevier BV; Volume: 721; Issue: 4-5 Linguagem: Inglês

10.1016/j.physletb.2013.03.017

1873-2445

Christoph Englert, A. Freitas, M. Spira, P.M. Zerwas,

High-Energy Particle Collisions Research

The basic structure of top-quarks as spin-1/2 particles is characterized by the radius Rt and the intrinsic magnetic dipole moment κt, both individually associated with gauge interactions. They are predicted to be zero in pointlike theories as the Standard Model. We derive upper limits of these parameters in the color sector from cross sections measured at Tevatron and LHC in top pair production pp¯/pp→tt¯, and we predict improved limits expected from LHC in the future, especially for analyses exploiting boosted top final states. An additional method for measuring the intrinsic parameters is based on tt¯+jet final states.