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

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

doi:10.1140/epjc/s10052-015-3708-y

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

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

Authors

Mirkoantonio Casolino

Trisha Farooque

Aurelio Juste

Tao Liu

Professor Michael Spannowsky michael.spannowsky@durham.ac.uk
Director

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

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