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Bounds reach of a future circular collider on the parameters of a minimal Baryon-Lepton symmetric model

Marlon P. Brade, Jeremiah D. Juevesano, Dennis C. Arogancia, Jan Mickelle V. Maratas

TL;DR

This work assesses the FCC-hh's potential to discover or exclude a heavy $Z'$ boson in the minimal $U(1)_{B-L}$ extension of the Standard Model. Using dilepton final states, MC generation with MG5_aMC, DELPHES-based detector simulation, and a CLs-based 95% CL search, the study maps the reach in the $(M_{Z'}, g')$ plane, and employs DARKCAST to reinterpret existing limits from past experiments. The results show that with $\sqrt{s}=100$ TeV and $L=30~\text{ab}^{-1}$, a $Z'$ with $g'=0.3$ can be excluded up to $M_{Z'} \approx 45$ TeV, highlighting the FCC-hh's exceptional sensitivity in the multi-TeV regime. The analysis demonstrates the FCC-hh's ability to probe B-L and related $U(1)_X$ extensions, bridging current collider exclusions and open parameter space for dark sector interactions, while ensuring comparability with low-energy searches through the DARKCAST framework.

Abstract

This paper investigates the physics potential of the proton-proton Future Circular Collider (FCC-hh) in the search for a new heavy gauge boson, Z', within the framework of the minimal Baryon-Lepton (B-L) symmetric model. We examine the exclusion limits on the mass of the Z' boson for various sets of coupling constants, utilizing leptonic decays, specifically into charged lepton pairs (electron and muon). Using the DARKCAST framework, we compare the parameter constraints derived from previous experiments with the expected reach of the FCC-hh, providing insights into the collider sensitivity and potential to probe new physics beyond the Standard Model.

Bounds reach of a future circular collider on the parameters of a minimal Baryon-Lepton symmetric model

TL;DR

This work assesses the FCC-hh's potential to discover or exclude a heavy boson in the minimal extension of the Standard Model. Using dilepton final states, MC generation with MG5_aMC, DELPHES-based detector simulation, and a CLs-based 95% CL search, the study maps the reach in the plane, and employs DARKCAST to reinterpret existing limits from past experiments. The results show that with TeV and , a with can be excluded up to TeV, highlighting the FCC-hh's exceptional sensitivity in the multi-TeV regime. The analysis demonstrates the FCC-hh's ability to probe B-L and related extensions, bridging current collider exclusions and open parameter space for dark sector interactions, while ensuring comparability with low-energy searches through the DARKCAST framework.

Abstract

This paper investigates the physics potential of the proton-proton Future Circular Collider (FCC-hh) in the search for a new heavy gauge boson, Z', within the framework of the minimal Baryon-Lepton (B-L) symmetric model. We examine the exclusion limits on the mass of the Z' boson for various sets of coupling constants, utilizing leptonic decays, specifically into charged lepton pairs (electron and muon). Using the DARKCAST framework, we compare the parameter constraints derived from previous experiments with the expected reach of the FCC-hh, providing insights into the collider sensitivity and potential to probe new physics beyond the Standard Model.

Paper Structure

This paper contains 11 sections, 8 equations, 3 figures.

Table of Contents

  1. Introduction
  2. Minimal Baryon - Lepton Model
  3. Yang-Mills Lagrangian
  4. Spontaneous Symmetry Breaking
  5. Simulation Setup
  6. Monte Carlo Generation
  7. Detector Response
  8. Statistical Analysis
  9. Determination of $(M_{Z'}, g')$ Bounds
  10. Results and discussion
  11. Summary and Conclusions

Figures (3)

  • Figure 1: Invariant mass for the case of $M_{Z'} = 10$ TeV and $g' = 0.2$ in the $\ell^+ \ell^-$ channel.
  • Figure 2: 95% CL limit versus mass for the combined dilepton (ee, $\mu\mu$) channel. The colored solid curves correspond to different values of the coupling constant ($g' = 0.1$–0.3), while the dashed black line represents the median expected limit derived from the background-only hypothesis. The green and yellow bands indicate the 68% and 95% expected confidence intervals, respectively.
  • Figure 3: Limits of the coupling and mass of $Z'$ with respect to previous experiments and the extended limits of this bounds determined from the simulation.