Hadron and Nuclear Physics with Photon Beams in Japan

by Atsushi Tokiyasu (Tohoku University, Japan)

Friday 7 Feb 2025, 14:00 → 17:00 Europe/Rome

Aula Conversi (LNF)

At the Research Center for Accelerator and Radioisotope Science (RARiS) in Japan, research in nuclear and hadron physics is conducted using low-energy electron beams and high-energy photon beams. This presentation will introduce our recent achievements, including the observation of a dibaryon state—a bound state of two Δ particles—and the precise measurement of the proton's radius via electron scattering in the ULQ2 project. RARiS also participates in collaborative experiments at SPring-8/LEPS2, where high-energy photons generated through inverse Compton scattering are used in hadron physics research. In this experiment, we employ two detector systems: the LEPS2-solenoid spectrometer and the BGOegg electromagnetic calorimeter. We have recently completed the first phase of data collection and are currently analyzing the results. Our primary goal is to search for the K^−pp bound state via photoproduction. This talk will provide an overview of our activities, highlighting the role of photon beams in advancing nuclear and hadron physics in Japan.

Additionally, I will discuss future directions at RARiS and explorepotential new research initiatives in this field.

Locandina_Tokiyasu.docx