A New Candidate for Non-Strangeness Pentaquarks : N^*(1675)(Pentaquarks and related topics, Exotic hadrons, New Frontiers in QCD-Exotic Hadrons and Hadronic Matter-)

概要

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We study a new nucleon resonance from η photoproduction, which was observed at √<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 η 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) : μ_<γnn^*>≫μ_<γpp^*>, which indicates that the newly found nucleon resonance may be identified as a non-strange pentaquark state.
理論物理学刊行会の論文
2007-11-09