2020/09/08 by Ariel Arza, Arza, Ariel · 1 citation
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2009.03870
openalex publication_date 2020/09/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Taking a two interacting scalar toy model with interaction term gϕχ2, we study the production of χ particles coming from the decay of an asymptotic and highly occupied beam of ϕ particles. We perform a nonperturbative analysis coming from parametric resonant instabilities and investigate the possibility that massive χ particles are produced from decays of massless ϕ particles from the beam. Although this process is not present in a perturbative analysis, our nonperturbative approach allows it to happen under certain conditions. For a momentum p of the beam particles and a mass mχ of the produced ones, we find that the decay is allowed if the energy density of the beam exceeds the instability threshold p2 mχ4/(2g2). We also provide an analytical expression for the spontaneous decay rate at the earliest time.