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Article overview
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Features of $omega$ photoproduction off nucleon at forward angles (I): Dominance of $pi$ exchange with Regge cuts and scaling of differential cross sections | | Byung-Geel Yu
; Kook-Jin Kong
; | | Date: |
12 Oct 2017 | | Abstract: | We investigate photoproduction of $omega$ off nucleon targets $gamma
N oomega N$ by using a Reggeized model where
$pi(135)+sigma(500)+f_1(1285)+f_2(1270)$+Pomeron exchanges are included in
the $t$-channel for the reaction at forward angles. The reaction mechanism at
low energy is featured by dominance of $pi$ exchange with the absorptive cuts
introduced to modulate the pion contribution in both $gamma p o omega p$ and
$gamma n o omega n$ reactions. Necessity of $sigma$ exchange is illustrated
to reproduce the cross section from natural parity exchanges. Cross sections
for differential, total, and spin density matrix with beam polarization are
reproduced and compared with existing data on $gamma p o omega p$. Scaled
differential cross sections of Jefferson Lab data on $gamma p o omega p$ are
investigated at the production angle $ heta=90^circ$ with the nonlinear
trajectories for saturation. Differential and total cross sections for the
$gamma n oomega n$ reaction are analyzed to compare with recent experimental
data at the CBELSA/TAPS Collaboration. | | Source: | arXiv, 1710.4511 | | Services: | Forum | Review | PDF | Favorites | |
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