Maurizio Consoli (Università e INFN Catania (IT)), "Second resonance of the Higgs field: more signals from the LHC experiments"

by Maurizio Consoli (Universita e INFN, Catania (IT))

Tuesday 17 Jan 2023, 14:00 → 16:00 Europe/Zurich

U2-02 (MIB)

Theoretical arguments and lattice simulations suggest that, beside the known resonance of mass mh= 125 GeV, the Higgs field might exhibit a second resonance with a larger mass (MH)theor=690±10 (stat)±20 (sys) GeV which, however, would couple to longitudinal W's 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. By looking for some evidence in the LHC data, we argue that the existence of a new resonance in the predicted mass region finds support in two analyses by ATLAS (searching for heavy resonances decaying into final states with 4 charged leptons or γγ pairs) and in more recent CMS results (searching for heavy resonances decaying into a pair of h(125) bosons or looking for γγ pairs produced in pp double-diffractive scattering). Since the correlation of these measurements is very small and since, having some definite theoretical prediction, local deviations from the pure background are not downgraded by the look-elsewhere effect, we emphasize the instability of the present situation that could probably be resolved by just adding two crucial, missing samples of RUN2 data.