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arXiv · 1701.06387

Is there a narrow $N(1685)$?

A. V. Anisovich·V. Burkert·E. Klempt·V. A. Nikonov·A. V. Sarantsev·U. Thoma
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Abstract

The helicity-dependent observable $E$ for the reaction $γd\to ηn (p)$ 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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A. V. Anisovich, V. Burkert, E. Klempt, V. A. Nikonov, A. V. Sarantsev, U. Thoma. 2017-01-28. Is there a narrow $N(1685)$?. https://doi.org/10.1103/physrevc.95.035211

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