부산대학교 도서관

Summary: ``We consider the effect of including a nonminimal couplingbetween a $U(1)$ vector gauge field and the graviton Regge trajectoryin holographic QCD models. This coupling describes the QCD interactionbetween the quark bilinear electromagnetic current and the Pomeron. Wetest this new coupling against DIS data at low Bjorken $x$ and obtainan excellent fit with a chi squared of 1.1 over a very largekinematical range in the photon virtuality $Q^2<400$ $\rm GeV^2$ andfor $x<10^{-2}$. The scale of the new dimension full coupling, whicharises from integrating higher spin fields, is of order 1--10 GeV. Thisvalue matches precisely the expectations from effective field theory,which indicate that such corrections are controlled by the mass gapbetween the spin two and spin four glueballs that are describedholographically by the graviton and spin four field in the gravitonRegge trajectory, respectively.''