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Recent results on heavy resonances at CMS

Yihui Lai

TL;DR

The paper surveys CMS Run 2 searches for heavy resonances focused on top quark and Higgs boson final states. It systematically constrains a broad set of BSM scenarios, including Z' bosons, Kaluza-Klein gluons, dark matter mediators, and charged Higgs states, using diverse final states and advanced jet tagging techniques. Across ttbar channels and γV final states, no significant anomalies are observed, leading to stringent mass limits. The results extend sensitivity to several TeV scales, e.g., Z' up to 6.85 TeV, KK gluons up to 5 TeV, and DM mediators up to 3.9 TeV, significantly strengthening constraints on heavy resonances in the CMS program.

Abstract

The Standard Model (SM) of particle physics provides a successful description of elementary particles and their interactions. However, it does not explain phenomena such as the hierarchy problem or the nature of dark matter. Many Beyond the Standard Model (BSM) theories provide answers to these open questions by adding new heavy resonances, which can be probed directly at colliders. This note summarizes recent resonance searches by the CMS Collaboration, focusing on final states containing top quarks and Higgs bosons.

Recent results on heavy resonances at CMS

TL;DR

The paper surveys CMS Run 2 searches for heavy resonances focused on top quark and Higgs boson final states. It systematically constrains a broad set of BSM scenarios, including Z' bosons, Kaluza-Klein gluons, dark matter mediators, and charged Higgs states, using diverse final states and advanced jet tagging techniques. Across ttbar channels and γV final states, no significant anomalies are observed, leading to stringent mass limits. The results extend sensitivity to several TeV scales, e.g., Z' up to 6.85 TeV, KK gluons up to 5 TeV, and DM mediators up to 3.9 TeV, significantly strengthening constraints on heavy resonances in the CMS program.

Abstract

The Standard Model (SM) of particle physics provides a successful description of elementary particles and their interactions. However, it does not explain phenomena such as the hierarchy problem or the nature of dark matter. Many Beyond the Standard Model (BSM) theories provide answers to these open questions by adding new heavy resonances, which can be probed directly at colliders. This note summarizes recent resonance searches by the CMS Collaboration, focusing on final states containing top quarks and Higgs bosons.
Paper Structure (4 sections, 4 figures)

This paper contains 4 sections, 4 figures.

Table of Contents

  1. Introduction
  2. Searches for Heavy Resonances in Top Quark Final States
  3. Searches for Heavy Resonances in Higgs Boson Final States
  4. Summary

Figures (4)

  • Figure 1: Representative Feynman diagrams at leading order for a scalar H or pseudoscalar A resonance production in gluon--gluon fusion (left), spin-1 particle $Z'/gKK$ production in quark--antiquark annihilation (middle), or production in association with a $t\bar{t}$ pair (right).
  • Figure 2: Observed and expected 95% CL upper limits on the production cross section of $Z'$ bosons decaying to $t\bar{t}$. The left and middle panels show the limits for a narrow-width $Z'$ with 1% resonance width from the single-lepton and fully hadronic analyses, respectively. The right panel shows the limits for a broader 4% width $Z'$, obtained from the associated $t\bar{t}Z'$ production analysis CMS-PAS-B2G-22-006CMS-PAS-B2G-24-003CMS-PAS-B2G-24-009.
  • Figure 3: Observed and expected 95% CL limits on $H^\pm \to tb$. The left panel shows the mass-dependent limits. The right panel shows a 2D likelihood scan for light- and $b$-quark associated production at $m_{H^\pm}=600$ GeV
  • Figure 4: left, expected and observed upper limits on the $Z'\to H+\gamma$, right, the upper limits on the $S\to Z+\gamma$