| With the mesonic theory was presented and tremendous new particles were found last century, lots of researches began to focused on the mesonic parton distribution func-tions. The valence quark distributions in pion were deeply studied and the constituent quark model, nonlocal chiral quark model and NJL(Nambu-Jona-Lasinio)model are the famous work about pion. However, the structure functions of kaon are not so clear at present.The DGLAP evolution equation describes the dynamic evolution of partons in Quan-tum Chromodynamics. The partons carried high momentum fractions continually radiate partons with smaller momentum fraction eventually the density of partons in small x re-gion will be larger and larger, and the unitarity of the cross section will be destroyed. The ZRS evolution equation considers both the shadowing and anti-shadowing effects in the evolving process. Therefore the ZRS evolution equation is applied to investigate the parton distribution functions in this work.In this dissertation, we mainly study the following points:1、We analyze the constituent quark model、nonlocal chiral-quark model and try to understand the similarity and difference between their valence quark distributions.2、We introduce the limits of the DGLAP evolution equation and put forward the method on how to use the ZRS evolution equation in kaon.3、By comparing the NA3 collaboration experiment data with our results, we found that the results can explain the data well according to the ZRS evolution equation and only valence quark distribution considered at the initial scale Q2=0.074GeV2. Also,the kaon parton distributions at different momentum scale are presented.4、Finally, we calculate the momentum of parton in the kaon and compare it with the other models, it seems that our result is reasonable, parton distribution function, the ZRS evolution equation, Kaon, parton distribution... |
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