TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhysProc.18.020
TI  - Search for heavy scalar or pseudoscalar states in $\mathrm{t \bar{t}}$ events at CMS
PY  - 2026/01/29
UR  - https://scipost.org/SciPostPhysProc.18.020
JF  - SciPost Physics Proceedings
JA  - SciPost Phys. Proc.
VL  - 
IS  - 18
SP  - 020
A1  - Jeppe, Laurids
AB  - A search for scalar or pseudoscalar states decaying to a top quark-antiquark pair ($\mathrm{t \bar{t}}$), using $138 \mathrm{ fb}^{-1}$ of pp collision data taken at $\sqrt{s} = 13 \mathrm{ TeV}$ using the CMS detector, is presented. Events with one or two leptons are analyzed using the invariant $\mathrm{t \bar{t}}$ mass ($m_{\mathrm{t \bar{t}}}$) as well as angular and spin correlation observables. An excess in the data is observed for low values of $m_{\mathrm{t \bar{t}}}$, preferring a pseudoscalar over a scalar hypothesis. It is interpreted in terms of a generic model of (pseudo)scalar boson production, as well as a simplified model of a $\mathrm{t \bar{t}}$ bound state ($\eta_{\mathrm{t}}$), yielding good agreement with the data. Moreover, limits on the couplings of additional (pseudo)scalar bosons to top quarks are set.
ER  -

@Article{10.21468/SciPostPhysProc.18.020,
	title={{Search for heavy scalar or pseudoscalar states in $\mathrm{t \bar{t}}$ events at CMS}},
	author={Laurids Jeppe and on behalf of the CMS collaboration},
	journal={SciPost Phys. Proc.},
	pages={020},
	year={2026},
	publisher={SciPost},
	doi={10.21468/SciPostPhysProc.18.020},
	url={https://scipost.org/10.21468/SciPostPhysProc.18.020},
}