Top Quark Compositeness: Feasibility and Implications

By A. Pomarol, J. Serra. 2008

158 citations recorded by the source corpus.

In models of electroweak symmetry breaking in which the SM fermions get their masses by mixing with composite states, it is natural to expect the top quark to show properties of compositeness. We study the phenomenological viability of having a mostly composite top. The strongest constraints are shown to mainly come from one-loop contributions to the T parameter. Nevertheless, the presence of light custodial partners weakens these bounds, allowing in certain cases for a high degree of top compositeness. We nd regions in the parameter space in which the T -parameter receives moderate positive contributions, favoring the electroweak t of this type of models. We also study the implications of having a composite top at the LHC, focusing on the process pp ! t tt t(b b) whose cross-section is enhanced at high-energies.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/5410069b71db220965e9ce80b7ddba1fffe58da2

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Citations in the corpus

Non-resonant new physics in top pair production at hadron colliders (2010, background): “There are however various ways to embed the right-handed top quarks into a SO(4) representation [32]: if it is a singlet, then ctu = ctd also and the isospin-1 sector reduces to the operator O (8,3) Qq only.”
Composite leptoquarks and anomalies in B-meson decays (2014, result): “Happily, we find thanks to mρ ∼ 10TeV and to the presence of light custodians [47, 48], we are consistent with the bounds coming from EWPT observables.”
Effective Lagrangian for a light Higgs-like scalar (2013, background): “[81] for the case of a composite top quark.”