2024/05/24 by Crivellin, Andreas
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2405.15933
Indications for new Higgs bosons at 95 GeV and 152 GeV with significance of 3.8σ and 4.3σ, respectively, have been obtained. While the former contains the inclusive γγ channel, the latter is obtained by combining several modes of associated di-photon production, i.e. γγ+X with X=ℓ, ℓ b, \rm MET, τ, ..., within the ΔSM (the Standard Model extended by a real triplet). Such a triplet predicts a positive definite shift in the W mass, in agreement with the current global electroweak fit, and its neutral component decays dominantly to W bosons (for small mixing angles). This offers a connection to t t differential distributions whose experimental signature is WW b b: A simplified model with a new scalar H, produced via gluon fusion and decaying to S and S^′ with subsequent (dominant) decays to WW and b b, respectively, has the same final state. In fact, adding this new physics polution to the Standard Model describes the leptonic t t distributions better by at least 5.8σ. Furthermore, assuming that S^′ is an SU(2)L singlet, the resulting di-photon signal strength is compatible with the 95 GeV γγ measurements. A possible UV completion of this simplified model is the Δ2HDMS, i.e. a 2HDM supplemented with a singlet and a real triplet, which can successfully accommodate electroweak scale Baryogenesis.