PoS - Proceedings of Science
Volume 316 - XXVI International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2018) - WG2: Small-x and Diffraction
Progress in higher order computations of prompt photon production in e + A DIS at small x
R. Venugopalan* and K. Roy
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Pre-published on: September 20, 2018
Published on: November 23, 2018
We compute the differential cross-section for inclusive prompt photon production in deeply inelastic electron-nucleus scattering at small $x$ in the framework of the Color Glass Condensate (CGC) effective field theory (EFT). At leading order in $\alpha_s$, but all orders in $Q_s^2/Q^2$, where $Q_s$ is the saturation scale in the nucleus, our result is proportional to universal dipole and quadrupole Wilson line correlators in the nucleus. Leading twist $k_{\perp}$ and collinearly factorized results are recovered in appropriate limits. We outline recent progress in extending the LO results to NLO+NLL$x$ accuracy.
DOI: https://doi.org/10.22323/1.316.0053
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