In H→gg at a 240 GeV e+e− collider, the four-point energy-energy correlator with energy weight n=4 gives the strongest sensitivity to gluon spin correlations and, assuming perfect splitting-mode identification in the qq¯qq¯ channel, can probe a CP-mixing angle of ~0.03π with 20 ab−1.
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Parton spin correlations and $\mathcal{CP}$ properties in Higgs boson decay at future lepton colliders
In H→gg at a 240 GeV e+e− collider, the four-point energy-energy correlator with energy weight n=4 gives the strongest sensitivity to gluon spin correlations and, assuming perfect splitting-mode identification in the qq¯qq¯ channel, can probe a CP-mixing angle of ~0.03π with 20 ab−1.