Collider Accessible Long-Lived Inflaton Model
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Date
2025
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Abstract
This work explores the collider phenomenology of a general single-field inflaton model featuring long-lived particle signatures and a low reheating temperature, consistent with cosmological and collider constraints. We start by reviewing the key aspects of ΛCDM and the tensions that led to the proposal of the inflationary framework, its underlying physics, and the current status of particle physics with emphasis on dark sectors and scalars which are at the interplay between cosmology and particles. Then, we present our methodology to build the exclusion regions for neutral long-lived particles at the Future Circular Collider (FCC), detailing how we use the kinematics of each simulated event to obtain a probability of detection inside a fiducial detector volume, estimating the expected number of events at the FCC-hh reference detector.Finally, we introduce our particular model, explain briefly how the inflationary physics can be applied in a future work, derive the relations among the model parameters and choose the independent variables to be {m_ϕ, θ}, the inflaton mass and its mixing angle to the Standard Model Higgs boson. We implement this model in MadGraph5 with an effective vertex for gluon-gluon Fusion, explain the code we created to directly map the LHE events into the probability of detection, and ultimately find the exclusion region for the Future Circular Collider in its hadron-hadron mode. We also discuss why the Large Hadron Collider (LHC) lacks sensitivity to this model.
Description
Tesis (Master’s degree in Physics)--Pontificia Universidad Católica de Chile, 2025.
Keywords
Inflation, Long-lived particles, Simulation, Number of events, Cosmology