XXVIII International Workshop on Deep Inelastic Scattering and Related Subjects

NLO impact factor for inclusive photon+dijet production in e+A DIS at small x

24 Mar 2020, 16:48

18m

Brooklyn, NY

Contributed Talk Small-x, Diffraction and Vector Mesons Small-x, Diffraction and Vector Mesons

Speaker

Kaushik Roy (Stony Brook University and Brookhaven National Laboratory)

Description

We present the first computation of the next-to-leading order (NLO) photon+dijet impact factor in e+A DIS at small $x$ in the framework of the Color Glass Condensate (CGC) effective field theory. When combined with the recent derivation of JIMWLK small $x$ evolution to next-to-leading logarithm (in $x$) accuracy, this result provides us with a prediction of the photon+dijet cross-section in e+A DIS to O(${\alpha }_S^3\ln (1/x)$) accuracy. In the soft photon limit, the Low-Burnett-Kroll soft photon theorem allows us to obtain the first CGC results for inclusive dijet production up to the same accuracy. The comparison of these results with dijet and photon+dijet measurements at a future Electron Ion Collider (EIC) therefore provides a precision test of the systematics of gluon saturation. A remarkable simplification is brought about by the use of momentum space ``dressed'' quark and gluon propagators in the light cone gauge $A^{-}=0$ which facilitates the extension of our computational techniques to higher loop orders.