DAPNIA-07-16 |
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Cross Sections for the gamma p --> K^ *0 Sigma^+ Reaction at E_ gamma = 1.7 - 3.0 GeV (rapid communication) (nucl-ex/0701036v1) |
I. Hleiqawi et al (R. de Masi, M. Garcon, F.X. Girod, F. Sabatie) |
Differential cross sections for the reaction $\\gamma p \\to K^{*0} \\Sigma^+$ are presented at nine bins in photon energy in the range from 1.7 to 3.0 GeV. The \\kstar was detected by its decay products, $K^+\\pi^-$, in the CLAS detector at Jefferson Lab. These data are the first \\kstar photoproduction cross sections ever published over a broad range of angles. Comparison with a theoretical model based on the vector and tensor $K^*$-quark couplings shows good agreement with the data in general, after adjusting the model\'s two parameters in a fit to our data. Disagreement between the data at forward angles and the global angle-energy fit to the model suggests that the role of scalar $\\kappa$ meson exchange in $t$-channel diagrams should be investigated. |