A new candidate for non-strangeness pentaquarks: N*(1675)
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We study a new nucleon resonance from eta photoproduction, which was observed at sqrt{s}=1675 MeV with a narrow decay width (~10 MeV) by the Tohoku LNS group as well as the GRAAL collaboration. Using an effective Lagrangian approach, we compute differential cross sections for the eta photoproduction. In addition to N*(1675,1/2+-,3/2+-), we employ six other nucleon resonances, i.e. N*(1520,1535,1650,1675,1710,1720) and vector meson exchanges which are the most relevant ones to this reaction process. As a result, we can reproduce the GRAAL data qualitatively well and observe obvious isospin asymmetry between the transition magnetic moments of N*(1675): mu_{gamma nn*} >> mu_{gamma pp*}, which indicates that the newly found nucleon resonance may be identified as a non-strange pentaquark state.
5 pages, 8 figures, Talk given at Yukawa International Seminar (YKIS) 2006 "New frontiers in QCD", 20 Nov. ~ 8 Dec. 2006, Yukawa Institute for Theoretical Physics (YITP), Kyoto, Japan
5 pages, 8 figures, Talk given at Yukawa International Seminar (YKIS) 2006 "New frontiers in QCD", 20 Nov. ~ 8 Dec. 2006, Yukawa Institute for Theoretical Physics (YITP), Kyoto, Japan