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Singlet scalars as Higgs imposters at the Large Hadron Collider
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An electroweak singlet scalar can couple to pairs of vector bosons through loop-induced dimension five operators. Compared to a Standard Model Higgs boson, the singlet decay widths in the diphotons and Z gamma channels are generically enhanced, while decays into massive final states like WW and ZZ are kinematically disfavored. The overall event rates into gamma gamma and Z gamma can exceed the Standard Model expectations by orders of magnitude. Such a singlet may appear as a resonant signal in the gamma gamma and Z gamma channels, even with a mass above the WW kinematic threshold.
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Cited by 1 Pith paper
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Search for the Higgs boson decay to a $Z$ boson and a photon in $pp$ collisions at $\sqrt{s}=13$ TeV and $13.6$ TeV with the ATLAS detector
ATLAS measures the Higgs to Z and photon signal yield as 1.3 +0.6 -0.5 times the Standard Model prediction in the combined 305 inverse femtobarn dataset, with 2.5 sigma observed significance.
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