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Resonance-like structure near the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>η</mml:mi><mml:mi>d</mml:mi></mml:mrow></mml:math> threshold in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>γ</mml:mi><mml:mi>d</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:mi>η</mml:mi><mml:mi>d</mml:mi></mml:mrow></mml:math> reaction
To investigate the interaction between the nucleon $N$ and nucleon resonance $N(1535)1/{2}^{\ensuremath{-}}$, the $\ensuremath{\eta}d$ threshold structure connected to the isoscalar $S$-wave $N\text{\ensuremath{-}}N(1535)1/{2}^{\ensuremath{-}}$ system has been experimentally studied in the $\ensuremath{\gamma}d\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}\ensuremath{\eta}d$ reaction at incident photon energies ranging from the reaction threshold to 1.15 GeV. A strong enhancement is observed near the …