Emerging Excess Consistent with a Narrow Resonance at 152 GeV in High-Energy Proton-Proton Collisions

The discovery of the Higgs boson at CERN’s Large Hadron Collider (LHC) completed the Standard Model (SM), yet evidence for physics beyond the SM remains crucial. Intriguingly, LHC Run 1 (2010–2012) data showed an excess in muon-electron invariant mass around $150\pm5$ GeV, hinting at a new Higgs-like scalar boson ($S$). Additional anomalies—such as multilepton events, moderate missing energy, and potential bottom quark jets—also show deviations from SM expectations. These signatures are explained by a simplified model featuring a heavier Higgs boson ($H$) decaying into two lighter scalars ($S$), where $S$ decays into $W$ bosons, $b$-quarks, or invisibly. Using this model, we identify narrow excesses in di-photon and $Z$-photon channels near 152 GeV. Incorporating the latest di-photon plus lepton data, we find a combined global significance of $5.4\sigma$—the strongest signal to date for a narrow resonance consistent with beyond the SM (BSM) physics in proton-proton collisions at the LHC. If confirmed, this new resonance could signal the start of a BSM epoch in particle physics, offering insights into unresolved mysteries such as dark matter, electroweak symmetry breaking, and the origin of mass beyond the current theoretical framework.