η Photoproduction Off the Neutron at GRAAL: Evidence for a Resonant Structure at W = 1.67 GeV

η Photoproduction Off the Neutron at GRAAL: Evidence for a Resonant Structure at W = 1.67 GeV
Abstract

New data on η photoproduction off the neutron are presented. These data reveal a resonant structure at W=1.67 GeV. Meson photoproduction on the neutron may provide essentially new information regarding the spectrum of baryons. An example is given by a model 1 which exploits the SU(6) symmetry and assumes single-quark tran-sitions from ground nucleons to the [70,1 − ] supermultiplet. The modelpredicts only weak photoexcitation of the D 15 (1675) resonance from the proton target. Conversely, photon-neutron couplings of D 15 (1675) calcu-lated in the framework of this approach are not small. Measurements of therelative strength of photoneutron/photoproton interaction are therefore animportant testing ground for this (and others) theoretical approaches.

V. Kuznetsov , O. Bartalini, V. Bellini, M. Castoldi, A. D’Angelo, J-P. Didelez, R. Di Salvo, A. Fantini, D. Franco, G. Gervino, F. Ghio, B. Girolami, A. Giusa, M. Guidal, E. Hourany, R. Kunne, A. Lapik, P. Levi Sandri, D. Moricciani, L. Nicoletti, C. Randieri, N. Rudnev, G. Russo, C. Schaerf, M.L. Sperduto, M.C. Sutera, A. Turinge (2004)

NSTAR 2004, Proceedings of Workshop on the Physics of Excited Nucleons, Grenoble (France), 24-27 March 2004.
World Scientific Publishing Co. Pte. Ltd., November 2004, pp. 197-203, doi: 10.1142/9789812702272_0022.

World ScientificWorld Scientific Publishing Company was established in 1981 with only 5 employees in a tiny office. Today, the company employs more than 200 staff at its headquarters in Singapore and 450 globally. It has offices in New Jersey, London, Geneva, Hong Kong, Taipei, Beijing, Shanghai, Tianjin and Chennai. In about 3 decades, it has established itself as one of the leading scientific publishers in the world, and the largest international scientific publisher in the Asia-Pacific region. World Scientific publishes about 600 new titles a year and 130 journals in various fields.

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