Izlaganje sa skupa
Experimental program at SPring-8
Tomoaki Hotta (for the LEPS collaboration)
; Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka, 567-0047 Japan
Sažetak
A highly-polarized photon beam produced via the backward Compton scattering of polarized laser photons off the high-energy electrons is utilized for nuclear and particle physics experiments at SPring-8. The present status of the experiments at the Laser Electron Photon beamline at SPring-8 (LEPS) is reported. From the recent results, the evidence for a five-quark baryon resonance is presented. A sharp baryon resonance peak was observed at 1.54 ± 0.01 GeV/c2 with a width smaller than 25 MeV/c2 in the γn → K+K−n reaction on 12C. The resonance has the strangeness quantum number S = +1 and it can not be formed by three quarks.
Ključne riječi
backward Compton scattering of polarized laser photons off high-energy electrons; five-quark baryon resonance
Hrčak ID:
305888
URI
Datum izdavanja:
1.6.2004.
Posjeta: 341 *