Experimental Upper Limit on the Photoproduction Cross Section for the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ψ</mml:mi><mml:mn/><mml:mo>(</mml:mo><mml:mn>3105</mml:mn><mml:mo>)</mml:mo><mml:mn/></mml:math>

The experimental upper limit for the diffractive photoproduction of the ψ(3105) is 29 nb, with 90% confidence, at an average photon energy of 18.2 GeV.Received 5 December 1974DOI:https://doi.org/10.1103/PhysRevLett.34.288©1975 American Physical Society