Double Diffractive Process Factorization from ηc and γ Associated Production at Tevatron and LHC

We present a study of associated ηc and γ double diffractive production in pp^- collision based on Ingelman-Schlein model, and the framework of non-relativistic QOD factorization formalism for quarkonia production. The prediction of ηc and γ is more reliable than J/ψ production, because the associated ηc and γ production is a pure color-octet process, and the dominant contribution comes from color octet ^1S0^(8) subprocess, which is related to the color octet matrix element of ^1S0(8) of J/ψ by the heavy quark spin symmetry and the large PT J/ψ production data. We find that the ratio of diffractive to inclusive cross sections is independent of the values of color octet matrix elements, but is sensitive to the gluon factor of the Pomeron and renormalized Pomeron flux factors. So experimental measurement of this ratio can give us more information of the nature of Pomeron and test the assumption of hard diffractive factorization in hadron-hadron collisions.

Double Diffractive Process Factorization from $eta_c$ and $gamma$ Associated Production at Tevatron and LHC

We present a study of associated$eta_c$ and $gamma$ double diffractive production in $pbar p$collision based on Ingelman-Schlein model, and the framework ofnon-relativistic QCD factorization formalism for quarkonia production. Theprediction of $eta_c$ and $gamma$ is more reliable than $J/psi$production, because the associated $eta_c$ and $gamma$ productionis a pure color-octet process, and the dominant contribution comesfrom color octet $^1S_0^{(8)}$ subprocess, which is related to the color octet matrix element of $^1S_0^{(8)}$ of $J/psi$ by theheavy quark spin symmetry and the large $P_T$ $J/psi$ productiondata. We find that the ratio of diffractive to inclusive crosssections is independent of the values of color octet matrixelements, but is sensitive to the gluon factor of the Pomeronand renormalized Pomeron flux factors. So experimental measurementof this ratio can give us more information of the nature ofPomeron and test the assumption of hard diffractive factorizationin hadron-hadron collisions.