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Non-resonant new physics in top pair production at hadron colliders

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Degrande, Céline [UCL] Gérard, Jean-Marc [UCL] Grojean, Christophe [CERN Physics Department, Theory Division, CH-1211, Geneva 23, Switzerland; Institut de Physique Théorique, CEA/Saclay, F-91191 Gif-sur-Yvette Cédex, France] Maltoni, Fabio [UCL] Servant, Géraldine [CERN Physics Department, Theory Division, CH-1211, Geneva 23, Switzerland; Institut de Physique Théorique, CEA/Saclay, F-91191 Gif-sur-Yvette Cédex, France]

We use top quark pair production as a probe of top-philic non-resonant new physics. Following a low energy effective field theory approach, we calculate several key observables in top quark pair production at hadron colliders (e.g., total cross section, t¯t invariant mass distribution, forward-backward asymmetry, spin correlations) including the interference of the Standard Model with dimension-six operators. We determine the LHC reach in probing new physics after having taken into account the Tevatron constraints. In particular, we show that the gluon fusion process gg → t¯t which remains largely unconstrained at the Tevatron is affected by only one top-philic dimension-six operator, the chromo-magnetic moment of the top quark. This operator can be further constrained by the LHC data as soon as a precision of about 20% is reached for the total t¯t cross-section. While our approach is general and model-independent, it is particularly relevant to models of Higgs and top compositeness, which we consider in detail, also in connection with t¯tt¯t and t¯tb¯b production.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2011
Language Anglais
Journal information "Journal of High Energy Physics" - Vol. 03, p. 125 (2011)
Peer reviewed yes
Publisher Published for SISSA by Springer
e-issn 1029-8479
Publication status Publié
Affiliations UCL - SST/IRMP - Institut de recherche en mathématique et physique
CERN Physics Department, Theory Division, CH-1211, Geneva 23, Switzerland; Institut de Physique Théorique, CEA/Saclay, F-91191 Gif-sur-Yvette Cédex, France
Keywords Beyond Standard Model ; Phenomenological Models ; Heavy Quark Physics ; Hadronic Colliders
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Permanent URL http://hdl.handle.net/2078.1/71971