Scaling Phenomenology in Meson Photoproduction from CLAS

Author:

Dey, Biplab  Meyer, Curtis A.  

Journal:

HADRON 2009

Issue Date:

2010

Abstract(summary):

In the high energy limit, perturbative QCD predicts that hard scattering amplitudes should follow simple scaling laws. For hard scattering at 900, we show that experiments support this prediction even in the "medium energy" regime of 2.3 GeV <= root s 2.84 GeV, as long as there are no s-channel resonances present. Our data consists of high statistics measurements for five different exclusive meson photoproduction channels (p omega, p eta, p eta', K(+) Lambda and K+Sigma(0)) recently obtained from CLAS at Jefferson Lab. The same power-law scaling also leads to "saturated" Regge trajectories at high energies. That is, at large -1 and -u, Regge trajectories must approach constant negative integers. We demonstrate the application of saturated Regge phenomenology by performing a partial wave analysis fit to the gamma p -> p eta' differential cross sections.

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