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| Home > Publications database > Top-quark spin correlations as a tool to distinguish pseudoscalar $A\rightarrow ZH$ and scalar $H \rightarrow ZA$ signatures in $Z t \bar{t}$ final states at the LHC |
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| Journal Article | PUBDB-2025-00864 |
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2025
Springer
Heidelberg
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Please use a persistent id in citations: doi:10.1007/JHEP06(2025)170 doi:10.3204/PUBDB-2025-00864
Report No.: DESY-25-023; IFT--UAM/CSIC-24-187; arXiv:2502.03443
Abstract: Both ATLAS and CMS have recentlyperformed the first searches for a heavy newspin-0 resonance decayinginto a lighter new spin-0 resonance and a $Z$ boson, wherethe lighter spin-0 resonance subsequently decaysinto $t \bar t$ pairs.These searches are of particularinterest to probe Two Higgs doublet model~(2HDM)parameter space regions that predict a strongfirst-order electroweak phase transition.In the absence of CP violation, the investigated decay ispossible if the lighterand the heavier spin-0 particles have oppositeCP parities. The analysis techniques employedby ATLAS and CMS do not distinguishbetween the two possible signatures $A \to ZH$and $H \to ZA$,where $A$ and $H$ denote CP-odd and CP-even Higgs bosons,respectively, if both signals are predicted to have the same totalcross sections.We demonstratethe capability of angular variables{that are}sensitive to spin correlations of the top quarksto differentiate between $A \to ZH$ and $H \to ZA$ decays,even in scenarios where both signalspossess identical totalcross sections. Focusing on masses of 600~GeV and 800~GeVas a representative 2HDM benchmark, we find that a distinction betweenthe two possible channels is possible with highsignificance with the anticipated data from the high-luminosity LHC,if the invariant mass distribution of the$t \bar t$ system is further binned inangular variables defined by the direction of flightof the leptons produced in the top-quark decays.Moreover, we find a moderategain in experimental sensitivity due tothe improved background rejection for both signals.
Keyword(s): Multi-Higgs Models ; Specific BSM Phenomenology
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