Skip to main content

Research Repository

Advanced Search

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

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

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


Mirkoantonio Casolino

Trisha Farooque

Aurelio Juste

Tao Liu


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.


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.

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


Published Journal Article (1.4 Mb)

Publisher Licence URL

Copyright Statement
This article is distributed under the terms of the Creative<br /> Commons Attribution 4.0 International License (http://creativecomm<br />, which permits unrestricted use, distribution,<br /> and reproduction in any medium, provided you give appropriate credit<br /> to the original author(s) and the source, provide a link to the Creative<br /> Commons license, and indicate if changes were made.<br /> Funded by SCOAP3.

You might also like

Downloadable Citations