Σp scattering experiment at J-PARC – results of commissioning run –.

The Σp scattering experiment has just been started at J-PARC this year (2018). We made ”Σ beam factory” a reality where a beam with an intensity of more than 5 × 10⁵ Σ⁻ beam per day could be produced by using 20 M/spill π⁻ beam. The CATCH system, which is a dedicated system to detect recoil proton from the Σp scattering, operated stably under the high counting rate, and its successful operation was confirmed by identifying the pp scattering events in J-PARC. In the June beam time, the production run of the Σ⁻ p scattering was carried out for 2 days, which was just 10% of the requested beam time. The remaining beam time of the Σ⁻ p channel and the Σ⁺ p channel will take place in the spring of 2019. [ABSTRACT FROM AUTHOR]