https://doi.org/10.1140/epjc/s10052-014-3065-2
Regular Article - Theoretical Physics
Higgs characterisation at NLO in QCD: CP properties of the top-quark Yukawa interaction
1
Centre for Cosmology, Particle Physics and Phenomenology (CP3), Université catholique de Louvain, 1348, Louvain-la-Neuve, Belgium
2
Theoretische Natuurkunde and IIHE/ELEM, Vrije Universiteit Brussel, and International Solvay Institutes, Pleinlaan 2, 1050, Brussels, Belgium
3
Departamento de Física Teórica y del Cosmos y CAFPE, Universidad de Granada, Granada, Spain
4
Sorbonne Universités, UPMC University Paris 06, UMR 7589, LPTHE, 75005, Paris, France
5
CNRS, UMR 7589, LPTHE, 75005, Paris, France
* e-mail: kentarou.mawatari@vub.ac.be
Received:
29
July
2014
Accepted:
2
September
2014
Published online:
23
September
2014
At the LHC the CP properties of the top-quark Yukawa interaction can be probed through Higgs production in gluon fusion or in association with top quarks. We consider the possibility for both CP-even and CP-odd couplings to the top quark to be present, and study CP-sensitive observables at next-to-leading order (NLO) in QCD, including parton-shower effects. We show that the inclusion of NLO corrections sizeably reduces the theoretical uncertainties, and confirm that di-jet correlations in jet production through gluon fusion and correlations of the top-quark decay products in
production can provide sensitive probes of the CP nature of the Higgs interactions.
© SIF and Springer-Verlag Berlin Heidelberg, 2014