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Backward-angle photoproduction of π⁰ mesons on the proton at E_γ = 1.5--2.4 GeV

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arxiv 0708.1600 v1 pith:4U6OSNBB submitted 2007-08-12 nucl-ex

Backward-angle photoproduction of π⁰ mesons on the proton at E_γ = 1.5--2.4 GeV

classification nucl-ex
keywords beengammaanglesasymmetriesbackwardbeamchannelcross
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Differential cross sections and photon beam asymmetries for $\pi^0$ photoproduction have been measured at $E_\gamma$ = 1.5--2.4 GeV and at the $\pi^0$ scattering angles, --1 $<$ cos$\Theta_{c.m.} <$ --0.6. The energy-dependent slope of differential cross sections for $u$-channel $\pi^0$ production has been determined. An enhancement at backward angles is found above $E_\gamma$ = 2.0 GeV. This is inferred to be due to the $u$-channel contribution and/or resonances. Photon beam asymmetries have been obtained for the first time at backward angles. A strong angular dependence has been found at $E_\gamma >$ 2.0 GeV, which may be due to the unknown high-mass resonances.

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