Stringent limits on top-quark compositeness from t t ̄ production at the Tevatron and the lhc stringent limits on top-quark compositeness ⋯ M. fabbrichesi, M. pinamonti, and A. tonero

• Author(s): Fabbrichesi, M. ; Pinamonti, M. ; Tonero, A. [UNESP]
• Date: 2018
• Persistent ID: http://hdl.handle.net/11449/171528
• Origin: Oasisbr
• Document Type: Journal article
• Language: English

Description

Made available in DSpace on 2018-12-11T16:55:43Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-04-11

If the top quark is a composite state made out of some constituents, then 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 tt̄ 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. © 2014 American Physical Society.

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ICTP South American Institute for Fundamental Research, Instituto de Física Teórica, UNESP, Rua Dr. Bento T. Ferraz 271, 01140-070 São Paulo