Speaker
Prof.
Toshiyuki TAKAHASHI
(KEK)
Description
J-PARC was almost competed in early 2009 and started the operational era. Nuclear and particle physics experiments are carried out in the Hadron Facility, one of three experimental facilities in J-PARC, using high-intensity secondary beams such as kaons, pions etc produced from 30 GeV proton beam. K1.8 beamline, one of four beamlines available in 2010, delivers mass separated charged particle beam up to 2GeV/c. Since high-resolution beam analyzer system and a large acceptance and high-resolution spectrometer, SKS, are equipped in the beamline, a lot of hypernuclear physics experiments, especially spectroscopy on S=-2 system, are planned.
Among those experiments, pentaquark search (E19) was performed in 2010, as the first physics run in the Hadron Facility. Since the report on the discovery of the Theta+ by LEPS group [1], many positive results as well as negative one were reported. The existence of the Theta+ is not yet established so far. E19 was planned to confirm the existence of Theta+ and study production mechanism via the p(pi-,K-)X reaction with high missing mass resolution of ~1.5 MeV/c2 and high sensitivity of 75nb/sr at three incident momenta. We accumulated 16% of the aimed statistics in 2010 run at 1.92 GeV/c. In the talk, the latest analysis results will be presented. We will also the commissioning results of the beamline as well as physics program on hypernuclear and hadron physics at Hadron Facility.
Primary author
Prof.
Toshiyuki TAKAHASHI
(KEK)
