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Measurement of Dijet Cross-Sections with Leading Neutron in Photoproduction at HERA |
| Reference |
W Schmidke, talk presented at DIS 2000, July 2000 |
| Document |
Conference paper
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| Contact |
Armen Bunyatyan |
| Abstract |
An analysis is presented of dijets in photoproduction where a leading neutron with an energy $E_n >400$~GeV and angle $ heta_n<0.8$~mrad with respect to the proton direction is detected. The average photon-proton center-of-mass energy is about $pprox 200$~GeV. Differential cross sections ${
m d}\sigma/{
m d}E_T^{jet}$ and ${
m d}\sigma/{
m d}ta^{jet}$ are measured where $E_T^{jet}$ and $ta^{jet}$ are jet transverse energy and pseudorapidity. Furthermore differential cross--sections in $x_\gamma^{jet}$ and $x_\pi^{jet}$ are given where $x_\gamma^{jet}$ is the fraction of the photon momenta entering the hard scattering, and $x_\pi^{jet}$ is the fraction of pion momenta in a model where the interaction proceeds via exchange of a pion. The Monte Carlo predictions based on standard photoproduction processes or based on the one-pion-exchange model and using different parametrizations for the pion structure function are compared to the measurements. |
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