/ Experiment-HEP arXiv:1003.4585

Evidence for Narrow N*(1685) Resonance in Quasifree Compton Scattering on the Neutron

Kuznetsov, V. (Dubna, JINR) ; Polyakov, M.V. (St. Petersburg, INP) ; Bellini, V. (Catania U.) ; Boiko, T. (Belarussian State Pedag. U.) ; Chebotaryov, S. (Kyungpook Natl. U.) ; Dho, H.-S. (Kyungpook Natl. U.) ; Gervino, G. (INFN, Turin) ; Ghio, F. (Rome, ISS) ; Giusa, A. (Catania U.) ; Kim, A. (Jefferson Lab) ; Kim, W. (Kyungpook Natl. U.) ; Mammoliti, F. (Catania U.) ; Milman, E. (Kyungpook Natl. U.) ; Ni, A. (Kyungpook Natl. U.) ; Perevalova, I.A. (Irkutsk State U.) ; Randieri, C. (Catania U.) ; Russo, G. (Catania U.) ; Sperduto, M.L. (Catania U.) ; Sutera, C.M. (INFN, Catania) ; Vall, A.N. (Irkutsk State U.)

Published in: Phys.Rev.
Year: 2011
Vol.: C83
Page No: 022201

Abstract: The first study of quasi-free Compton scattering on the neutron in the energy range of $E_{\gamma}=0.75 - 1.5$ GeV is presented. The data reveals a narrow peak at $W\sim 1.685$ GeV. This result, being considered in conjunction with the recent evidence for a narrow structure at $W\sim 1.68$GeV in the $\eta$ photoproduction on the neutron, suggests the existence of a new nucleon resonance with unusual properties: the mass $M\sim 1.685$GeV, the narrow width $\Gamma \leq 30$MeV, and the much stronger photoexcitation on the neutron than on the proton.

Web-Page: http://inspirebeta.net/record/849873/files/comp1a.png; http://inspirebeta.net/record/849873/files/comp2a.png; http://inspirebeta.net/record/849873/files/comp_me1.png; http://inspirebeta.net/record/849873/files/comp_sim1.png; http://inspirebeta.net/record/849873/files/cpn1a1.png; http://inspirebeta.net/record/849873/files/fr.png; http://inspirebeta.net/record/849873/files/graal.png

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