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26 April 2024

» arxiv » 1003.4585

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Evidence for Narrow N*(1685) Resonance in Quasifree Compton Scattering on the Neutron
V. Kuznetsov ; M. V. Polyakov ; V. Bellini ; T. Boiko ; S. Chebotarev ; F.Ghio ; A. Guisa ; G. Gervino ; W. Kim ; A. Kim ; F. Mammoliti ; E. Milman ; A. Ni ; I.A. Perevalova ; C. Randieri ; G. Russo ; M.L. Sperduto ; C.M. Sutera ; A.N. Vall ;
Date:	24 Mar 2010
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 $Wsim 1.685$ GeV. This result, being considered in conjunction with the recent evidence for a narrow structure at $Wsim 1.68$GeV in the $eta$ photoproduction on the neutron, suggests the existence of a new nucleon resonance with unusual properties: the mass $Msim 1.685$GeV, the narrow width $Gamma leq 30$MeV, and the much stronger photoexcitation on the neutron than on the proton.
Source:	arXiv, 1003.4585
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