2025/05/15 by Dayoung Lee, Lee, Dayoung, Seung-il Nam +3
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2505.10437
openalex publication_date 2025/05/15 · openalex created_date 2025/10/15 · openalex updated_date 2026/07/31
We investigate double ϕ production in pp reactions near threshold using an effective Lagrangian approach, highlighting a significant OZI rule violation through hadronic processes. Our model includes t- and u-channel contributions from the nucleon and s-wave N^* resonances (N^*(1535,1650,1895)), as well as the pentaquark-like state Ps(2071). In the s-channel, scalar (f0), tensor (f2), and pseudoscalar (η(2225)) mesons are incorporated. The N, N^*, f0, and f2 contributions enhance the cross-section and generate peak structures near W=2.2 GeV, consistent with JETSET data, while cusp structures arise from ΛΛ and ΣΣ threshold openings. Polarization observables, such as the spin density matrix element (SDME), further elucidate the underlying hadronic mechanisms.