Speaker
Description
The baryon interaction for the $S=-1$ system has been investigated in some spectroscopic experiments. On the other hand, the $S=-2$ system is not understood well, although results of emulsion experiments and femtoscopy were published recently. Spectroscopy of $\Xi$, $\Lambda\Lambda$ hypernuclei plays an important role to reveal the more general baryon-baryon interaction.
In J-PARC, a missing-mass spectroscopic experiment for $\Xi$ hypernuclei (J-PARC E70) started. In this experiment, $K^-$ beams are irradiated into a $^{12}\mathrm{C}$ target and produces $\Xi$ hypernuclei, $^{12}_{\Xi}\mathrm{Be}$. This energy spectrum is given by the missing-mass method, whose resolution is expected to be 2 MeV/$c^2$ (FWHM) which would be the best resolution among existing data. In June, 2023, the first commissioning run was successfully carried out.
In this talk, we will introduce the J-PARC E70 experiment, and report some preliminary results of the first commissioning run.
