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arXiv 1003.4585hep-exhep-phnucl-ex
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中子准自由康普顿散射中N ~*（1685）共振的证据

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

V. Kuznetsov, M. V. Polyakov, V. Bellini, T. Boiko, S. Chebotarev, H. S. Dho, G. Gervino, F. Ghio, A. Giusa, A. Kim, W. Kim, F. Mammoliti, E. Milman, A. Ni, I. … 展开作者

V. Kuznetsov, M. V. Polyakov, V. Bellini, T. Boiko, S. Chebotarev, H. S. Dho, G. Gervino, F. Ghio, A. Giusa, A. Kim, W. Kim, F. Mammoliti, E. Milman, A. Ni, I. A. Perevalova, C. Randieri, G. Russo, M. L. Sperduto, C. M. Sutera, A. N. Vall

备注：
Replaced with the version published in Phys. Rev. C
发表信息：
Phys.Rev.C83:022201,2011
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摘要：

首次研究了$E_γ=0.75 - 1.5$ GeV能区中子的准自由康普顿散射。数据揭示了在$W\sim 1.685$ GeV处的窄峰。这一结果，被认为是与最近的证据在$W\sim 1.68$ GeV的$η$光生中子，表明存在一个新的核子共振与不寻常的属性：质量$M\sim 1.685$ GeV，窄宽度$Γ\leq 30$ MeV，和更强的光激发的中子比质子。

英文摘要：

The first study of quasi-free Compton scattering on the neutron in the energy range of $E_γ=0.75 - 1.5$ 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 $η$ 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 $Γ\leq 30$MeV, and the much stronger photoexcitation on the neutron than on the proton.

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