The paper shows that quantum interference between a 365 GeV pseudoscalar Higgs and the QCD continuum significantly changes its measured ttbar rate, offering observables to distinguish such a Higgs from toponium.
Exclusive top production at a Linear Collider at and off the threshold
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abstract
We review exclusive top pair production including decays at a future high-energy lepton collider, both in the threshold region and for higher energies. For the continuum process, we take complete QCD next-to-leading order matrix elements for the $2\to 6$ process with leptonic W decays into account. At threshold, we match the fixed-order relativistic QCD-NLO cross section to a nonrelativistic cross section with next-to-leading logarithmic (NLL) threshold resummation implemented via a form factor.
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Contrasting Pseudoscalar Higgs and Toponium States at the LHC and Beyond
The paper shows that quantum interference between a 365 GeV pseudoscalar Higgs and the QCD continuum significantly changes its measured ttbar rate, offering observables to distinguish such a Higgs from toponium.