Theoretical Arguments and Experimental Signals for a Second Resonance of the Higgs Field

Abstract

Theoretical arguments and lattice simulations suggest that, beside the known resonance of mass mh= 125 GeV, the Higgs field could exhibit a second mass scale (MH)theor=690±10(stat)±20(sys)GeV. In spite of its large mass, the heavier state would couple to longitudinal Ws with the same typical strength as the low-mass state at 125 GeV and thus represent a relatively narrow resonance mainly produced at LHC by gluon–gluon fusion. After summarizing these general aspects, we review a recent analysis of LHC data which support the idea of a new resonance in the predicted mass range. Since the correlation among these measurements is very small and since, with a definite theoretical prediction in some mass region, local excesses should not be downgraded by the look-elsewhere effect, we emphasize the present substantial statistical evidence which could become an important discovery by simply adding two, still missing, key analyses of the full RUN2 statistics.