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Backward-angle<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>η</mml:mi></mml:mrow></mml:math>photoproduction from protons at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>E</mml:mi><mml:mrow><mml:mi>γ</mml:mi></mml:mrow></mml:msub><mml:mo>=</mml:mo><mml:mn>1.6</mml:mn><mml:mo>–</mml:mo><mml:mn>2.4</mml:mn><mml:mi> </mml:mi><mml:mi mathvariant="normal">GeV</mml:mi></mml:mrow></mml:math>
Differential cross sections for η photoproduction from protons have been measured at Eγ=1.6–2.4GeV in the backward direction. A bump structure has been observed above 2.0 GeV in the total energy. No such bump is observed in η′,ω, and π0 photoproductions. It is inferred that this unique structure in η photoproduction …