Probing a light CP-odd scalar in di-top-associated production at the LHC

Casolino, Mirkoantonio; Farooque, Trisha; Juste, Aurelio; Liu, Tao; Spannowsky, Michael

Abstract

CP-odd scalars are an integral part of many extensions of the Standard Model. Recently, electroweak-scale pseudoscalars have received increased attention in explaining the diffuse gamma-ray excess from the Galactic Centre. Elusive due to absence of direct couplings to gauge bosons, these particles receive only weak constraints from direct searches at LEP or searches performed during the first LHC runs. We investigate the LHC’s sensitivity in probing a CP-odd scalar in the mass range 20≤mA≤10020≤mA≤100 GeV via di-top-associated production using jet-substructure-based reconstruction techniques. We parameterise the scalar’s interactions using a simplified model approach and relate the obtained upper limits to couplings within type-I and type-II 2HDMs as well as the NMSSM. We find that in di-top-associated production, experiments at the LHC can set tight limits on CP-odd scalars that fit the Galactic Centre excess. However, direct sensitivity to light CP-odd scalars from the NMSSM remains challenging.

Citation

Casolino, M., Farooque, T., Juste, A., Liu, T., & Spannowsky, M. (2015). Probing a light CP-odd scalar in di-top-associated production at the LHC. The European Physical Journal C, 75, Article 498. https://doi.org/10.1140/epjc/s10052-015-3708-y

• Journal Article Type: Article
• Acceptance Date: Sep 25, 2015
• Online Publication Date: Oct 22, 2015
• Publication Date: Oct 22, 2015
• Deposit Date: Nov 10, 2016
• Publicly Available Date: Mar 15, 2017
• Journal: European Physical Journal C: Particles and Fields
• Print ISSN: 1434-6044
• Electronic ISSN: 1434-6052
• Publisher: SpringerOpen
• Peer Reviewed: Peer Reviewed
• Volume: 75
• Article Number: 498
• DOI: https://doi.org/10.1140/epjc/s10052-015-3708-y
• Public URL: https://durham-repository.worktribe.com/output/1393606