A recent report of events by the BESIII collaboration suggests the presence of a structure at 3900 MeV. We argue that this structure, called in the past, is not in fact due to a new resonance but rather naturally emerges due to a combination of interference between nearby resonances and the opening of the channel. We further find that the appearance of this structure does not require suppression because of a radial node in the wave function, although a node improves fit quality. The measured coupling of is found to be substantially smaller than previously estimated. In addition, we report new corrections to the measured cross section at energies near . Published by the American Physical Society2024
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Measurements of the induced polarization in the quasi-elastic A(e,e′p→) process in non-coplanar kinematics
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