Photoproduction of $π^{0}$ With Plane Polarized 3-GeV Photons

The cross section for photoproduction of

π^{0}

mesons was measured at a photon energy of 3 GeV and squared four-momentum transfer (

t

) of -0.1 to -1.2

{(G e V / c)}^{2}

using plane-polarized photons. The asymmetry was found to be consistent with +1.0 for

t

values above -0.4 and below -1.1. For

- 0.4 <~ t <~ - 1.0

there is a dip in the asymmetry and at

t = - 0.6

it drops to 0.55 ± 0.15. This result precludes a simple Regge model with

ω^{0}

and

B

; a theoretical description requires Regge cuts or an

ω^{'}

exchange.

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Photoproduction ofπ0With Plane Polarized 3-GeV Photons