Nuclear Experiment
[Submitted on 23 Jan 2017 (v1), last revised 28 Jan 2017 (this version, v2)]
Title:Is there a narrow $N(1685)$?
View PDFAbstract:The helicity-dependent observable $E$ for the reaction $\gamma d\to \eta n (p)$ with a spectator proton was recently measured by the A2 Collaboration at MAMI in Mainz. The data were interpreted as further evidence for a narrow resonance with spin and parity $J^P=1/2^+$ ($P_{11}$ wave). However, a full partial wave analysis without any narrow resonance leads to an excellent description of the data, imposing a narrow resonance with the properties suggested by the A2 Collaboration leads to a significant deterioration of the fit quality: there is no need for a narrow resonance.
Submission history
From: Eberhard Klempt [view email][v1] Mon, 23 Jan 2017 13:47:43 UTC (42 KB)
[v2] Sat, 28 Jan 2017 17:34:19 UTC (42 KB)
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