Eur. Phys. J. C (2015) 75: 498
https://doi.org/10.1140/epjc/s10052-015-3708-y

Regular Article - Theoretical Physics

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

¹ Institut de Física d’Altes Energies (IFAE), 08193, Barcelona, Bellaterra, Spain
² Institució Catalana de Recerca i Estudis Avançats (ICREA), 08010, Barcelona, Spain
³ Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong S.A.R., People’s Republic of China
⁴ Department of Physics, Institute for Particle Physics Phenomenology, Durham University, Durham, DH1 3LE, UK

^* e-mail: michael.spannowsky@googlemail.com

Received: 11 August 2015
Accepted: 25 September 2015
Published online: 22 October 2015

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  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.