267 research outputs found

    EBAC-DCC Analysis of World Data of pi N, gamma N, and N(e,e') Reactions

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    The development, results, and prospect of the Dynamical Coupled-Channels analysis at Excited Baryon Analysis Center (EBAC-DCC) are reported.Comment: 6 pages, 7 figures. Contribution to the proceedings of the 8th International Workshop on the Physics of Excited Nucleons (NSTAR2011), Newport News, VA, USA, May 17-20, 201

    η\eta photoproduction off the deuteron and low-energy η\eta-nucleon interaction

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    We study η\eta photoproduction off the deuteron (γdηpn\gamma d\to\eta pn) at a special kinematics: 0.94\sim 0.94 GeV of the photon beam energy and 0\sim 0^\circ of the scattering angle of the proton. This kinematics is ideal to extract the low-energy η\eta-nucleon scattering parameters such as aηNa_{\eta N} (scattering length) and rηNr_{\eta N} (effective range) because the η\eta-nucleon elastic scattering is significantly enhanced. We show that if a ratio RR, the γdηpn\gamma d\to\eta pn cross section divided by the γpηp\gamma p\to\eta p cross section convoluted with the proton momentum distribution in the deuteron, is measured with 5% error, Re[aηN]{\rm Re}[a_{\eta N}] (Re[rηN]{\rm Re}[r_{\eta N}]) can be determined at the precision of ±\sim\pm0.1 fm (±\sim\pm0.5 fm), significantly narrowing down the currently estimated range of the parameters. The measurement is ongoing at the Research Center for Electron Photon Science (ELPH), Tohoku University.Comment: 4 pages, 5 figures, Contribution to the Proceedings for 8th International Conference on Quarks and Nuclear Physics (QNP2018), November 13-17, 2018, Tsukuba, Japa

    Chiral Symmetry and N*(1440) -> N pi pi Decay

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    The N*(1440) -> N pi pi decay is studied by making use of the chiral reduction formula. This formula suggests a scalar-isoscalar pion-baryon contact interaction which is absent in the recent study of Hern{\'a}ndez et al. The contact interaction is introduced into their model, and is found to be necessary for the simultaneous description of g_{RN pi pi} and the pi-pi and pi-N invariant mass distributions.Comment: 12 page