Conference paper

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

Abstract

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.

Keywords

backward Compton scattering of polarized laser photons off high-energy electrons; five-quark baryon resonance

Hrčak ID:

305888

URI

https://hrcak.srce.hr/305888

Publication date:

1.6.2004.

Article data in other languages: croatian

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