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Emerging Narrow Resonance at 152 GeV

Srimoy Bhattacharya, Mukesh Kumar, Rachid Mazini, Bruce Mellado

TL;DR

The paper addresses the possibility of an additional scalar at the electroweak scale motivated by unresolved SM puzzles and persistent multi-lepton anomalies. It adopts a simplified H → SS(*) topology, with a heavy scalar $H$ ( $m_H \approx 270~\text{GeV}$) produced via gluon fusion decaying to two lighter scalars $S$ (one off-shell) with $m_S \approx 150~\text{GeV}$, predicting correlated final states including photons, leptons, MET, and jets. A sequential, channel-by-channel analysis across $\

Abstract

The discovery of the Higgs boson at the LHC completed the Standard Model (SM), yet the possibility of additional scalars remains open, provided their contributions to electroweak symmetry breaking are sufficiently small. Recent analyses of LHC data have revealed statistically significant anomalies in multi-lepton final states - events characterized by multiple leptons, missing transverse energy, and ($b$-)jets. These anomalies provide intriguing hints of physics beyond the SM. In this work, we present the signature of growing excesses for a new scalar resonance with a mass of $152 \pm 1$ GeV, observed in the $γγ$, $Zγ$, and $WW$ channels. The combined global significance reaches a level that points toward the growing signature of this resonance. The findings align with a simplified model in which a heavy scalar boson decays into two lighter scalars, thus providing a consistent framework explaining the observed multi-lepton anomalies. These results significantly advance the search for new scalar bosons at the electroweak scale. Future investigations, including precision studies with upcoming HL-LHC data, will be crucial for confirming the nature of this resonance and exploring its implications for extending the SM.

Emerging Narrow Resonance at 152 GeV

TL;DR

The paper addresses the possibility of an additional scalar at the electroweak scale motivated by unresolved SM puzzles and persistent multi-lepton anomalies. It adopts a simplified H → SS(*) topology, with a heavy scalar ( ) produced via gluon fusion decaying to two lighter scalars (one off-shell) with , predicting correlated final states including photons, leptons, MET, and jets. A sequential, channel-by-channel analysis across $\

Abstract

The discovery of the Higgs boson at the LHC completed the Standard Model (SM), yet the possibility of additional scalars remains open, provided their contributions to electroweak symmetry breaking are sufficiently small. Recent analyses of LHC data have revealed statistically significant anomalies in multi-lepton final states - events characterized by multiple leptons, missing transverse energy, and (-)jets. These anomalies provide intriguing hints of physics beyond the SM. In this work, we present the signature of growing excesses for a new scalar resonance with a mass of GeV, observed in the , , and channels. The combined global significance reaches a level that points toward the growing signature of this resonance. The findings align with a simplified model in which a heavy scalar boson decays into two lighter scalars, thus providing a consistent framework explaining the observed multi-lepton anomalies. These results significantly advance the search for new scalar bosons at the electroweak scale. Future investigations, including precision studies with upcoming HL-LHC data, will be crucial for confirming the nature of this resonance and exploring its implications for extending the SM.

Paper Structure

This paper contains 4 sections, 1 equation, 2 figures.

Table of Contents

  1. Introduction
  2. Multi-lepton anomalies and model motivation
  3. Methodology
  4. Results and discussion

Figures (2)

  • Figure 1: Timeline summarizing the evolution from early multi-lepton anomalies to the predicted narrow resonance near 150 GeV Crivellin:2023zui.
  • Figure 2: Combined $p$-values as a function of the hypothesized scalar mass. The minimum occurs near $152~\text{GeV}$, corresponding to a global significance of $5.3\sigma$Bhattacharya:2025rfr.