Demonstration of the double Q^2-rescaling model

In this paper we have demonstrated the double Q^2-rescaling model (DQ^2RM) of parton distribution functions of nucleon bounded in nucleus. With different x-region of l-A deep inelastic scattering process we take different approach: in high x-region (0.1\le x\le 0.7) we use the distorted QCD vacuum model which resulted from topologically multi -connected domain vacuum structure of nucleus; in low x-region (10^{-4}\le x\le10^{-3}) we adopt the Glauber (Mueller) multi- scattering formula for gluon coherently rescattering in nucleus. From these two approach we justified the rescaling parton distribution functions in bound nucleon are in agreement well with those we got from DQ^2RM, thus the validity for this phenomenologically model are demonstrated.Comment: 19 page, RevTex, 5 figures in postscrip

J/ψ+jetJ/\psi + jet diffractive production in the direct photon process at HERA

We present a study of $J/\psi + jet$ diffractive production in the direct photon process at HERA based on the factorization theorem for lepton-induced hard diffractive scattering and the factorization formalism of the nonrelativistic QCD (NRQCD) for quarkonia production. Using the diffractive gluon distribution function extracted from HERA data on diffractive deep inelastic scattering and diffractive dijet photon production, we show that this process can be studied at HERA with present integrated luminosity, and can give valuable insights in the color-octet mechanism for heavy quarkonia production.Comment: Revtex, 21 pages, 7 EPS figure

What about the contribution from reggeons in hard process of strong interactions?

We discuss in this paper the possible contributions from R_\rho(\rho-reggeon associated with \rho meson) in DIS process on protons. Using results from phenomenological analysis of high energy \pi-N charge-exchanged scattering process, we get the expression of effective propagator of R_\rho and the coupling constant \beta_\rho between R_\rho and light quarks. As a simple and concrete example, we use them to evaluate the contributions of R_\rho to F_2(x,Q^2) from charge-exchanged photoproduction quark-pair process,\gamma^* + p-->n + q_u + \bar{q}_d (--> n + X), in HERA kinematical regions. For a comparison, we also evaluate contributions both from pomeron and partons in the same process. The ratio of contributions in F_2(x,Q^2) from R_\rho versus IP is larger than 1%, therefore, the former may be tested experimentaly.Comment: 13 page, LaTex, 4 figure in postscript. To appear in Commu. in Theor. Phy