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

Casolino, Mirkoantonio and Farooque, Trisha and Juste, Aurelio and Liu, Tao and Spannowsky, Michael (2015) 'Probing a light CP-odd scalar in di-top-associated production at the LHC.', European physical journal C., 75 . p. 498.


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.

Item Type:Article
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Publisher statement:This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecomm, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Funded by SCOAP3.
Date accepted:25 September 2015
Date deposited:15 March 2017
Date of first online publication:22 October 2015
Date first made open access:No date available

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