2025/01/25 by Mengyuan Dai, Dai, Meng-Yuan, Cheng Chen +8
Physics and Astronomy · #Quantum Chromodynamics and Particle Interactions #Nuclear physics research studies #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.2501.15153
Roles of the Δ(1232), N*(1520), and N*(1650) resonances in the γp→π0π0p reaction near threshold is investigated within an effective Lagrangian approach. We have calculated the differential cross sections of the γp→π0π0p reaction by including the contributions from the Δ(1232), N*(1520), and N*(1650) intermediate states decaying into π0 p via the s-channel nucleon pole and t-channel ρ exchange, and found that the current experimental measurements can be well reproduced. The production of Δ(1232) is mainly from the mechanism of the s-channel nucleon pole, while the N*(1520) and N*(1650) are produced from the mechanism of the t-channel ρ exchange. It is expected that more experimental data on the γp → π0 π0 p reaction can be used to explore the properties of the low-lying excited baryon states and also the scalar f0(500) and f0(980) mesons.