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The scale factor is the effective cross section used to characterize themeasured rate of inclusive double dijet production in high energy hadroncollisions. It is sensitive to the two-parton distributions in the hadronicprojectile. In principle, the scale factor depends on the center of mass energyand on the minimal transverse energy of the jets contributing to the doubledijet cross section. Here, we point out that proton-proton collisions at theLHC will provide for the first time experimental access to these scaledependences in a logarithmically wide, nominally perturbative kinematic rangeof minimal transverse energy between 10 GeV and 100 GeV. This constrains thedependence of two-parton distribution functions on parton momentum fractionsand parton localization in impact parameter space. Novel information is to beexpected about the transverse growth of hadronic distribution functions in therange of semi-hard Bjorken x (0.001 < x < 0.1) and high resolution Q^2. Wediscuss to what extent one can disentangle different pictures of the$x$-evolution of two-parton distributions in the transverse plane by measuringdouble-hard scattering events at the LHC.

Testing the Scale Dependence of the Scale Factor in Double Dijet Production at the LHC