Consistency of the Two Higgs Doublet Model and CP violation in top production at the LHC

• Published in: arXiv.org
• Main Authors: Abdul Wahab El Kaffas, Khater, Wafaa, Ogreid, Odd Magne, Osland, Per
• Format: Paper
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 09.05.2007
• Subjects: Constraint modelling; Couplings; CP violation; Electroweak model; Large Hadron Collider; Parameters; Quarks; Supersymmetry
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.0605142

It is important to provide guidance on whether CP violation may be measurable in top-quark production at the Large Hadron Collider. The present work extends an earlier analysis of the non-supersymmetric Two-Higgs-Doublet Model in this respect, by allowing a more general potential. Also, a more comprehensive study of theoretical and experimental constraints on the model is presented. Vacuum stability, unitarity, direct searches and electroweak precision measurements severely constrain the model. We explore, at low \tan\beta, the allowed regions in the multidimensional parameter space that give a viable physical model. This exploration is focused on the parameter space of the neutral sector rotation matrix, which is closely related to the Yukawa couplings of interest. In most of the remaining allowed regions, the model violates CP. We present a quantitative discussion of a particular CP-violating observable. This would be measurable in semileptonically decaying top and antitop quarks produced at the LHC, provided the number of available events is of the order of a million.