Signature of pseudo Nambu–Goldstone Higgs boson in its decay

摘要

If the Higgs boson is a pseudo Nambu–Goldstone boson (PNGB), thehZγcontact interaction induced by theO(p4)invariants of the non-linear sigma model is free from its nonlinearity effects. The processh→Zγcan be used to eliminate the universal effects of heavy particles, which can fake the nonlinearity effects of the PNGB Higgs boson in the processh→V?V(V=W±,Z). We demonstrate that the ratio of the signal strength ofh→Zγandh→V?Vis good to distinguish the signature of the PNGB Higgs boson from Higgs coupling deviations.