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Is there a narrow $N(1685)$?

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arxiv 1701.06387 v2 pith:PUTEGFD4 submitted 2017-01-23 nucl-ex

classification nucl-ex
keywords narrowresonancecollaborationdataleadstherewaveanalysis
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abstract

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.

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