Nuclear Effects In High Energy Progresses Of Diffraction

In the recent years,more and more diffraction cases are found in CERN,HERA andTevatron. The accumulated experiments data of high energy diffraction process couldserve a sufficiently high accuracy for study on the nucleus’ structure. The high energydiffraction process are useful in research on the nucleus’ structure and promote ourcomprehension to the radiative correction. Lots of high energy hard diffraction processwere used on the study of Pomeron’s properties, and diffraction-generate of heavyquarkonium is one of such process.Using the generating mechanism of theη ccolor-octet and parameterization methodsin hard diffraction-generate process, under the approximation of the leading-order, withthe pomeron’s parton distribution function of ZEUS, H1and L. Alvero, We calculated thedifferential cross section and total cross section of the associated production ofη candγ inthe diffraction process ofπ meson and proton.the result, compared with experimental data,could be used to test the pomeron’s parton distribution function and the parameterizationmethods in the diffraction process.We utilized the pomeron’s structure function to calculate differential cross sectionand cross section of associated coherent diffraction ofη candγin the collision ofπ mesonand nucleus;and utilize the Glauber model to calculate differential cross section and crosssection of associated incoherent diffraction ofη candγ in the collision ofπ meson andnucleus.The nucleus effects will suppress the cross section of incoherent diffractionofη candγ associated production,differential cross section ratio, dσ A (A dy):dσ pdy,couldonly be sensible to large y area.the results will help to learn more about the generatingmechanism of nucleus’ effects.