Speaker
Kaushik Roy
(Stony Brook University)
Description
We present a first computation of the differential cross-section for in- clusive prompt-photon production in DIS to next-to-leading order (NLO) in αS at small-x within the framework of the Color Class condensate (CGC) [1]. The computation is performed to next-to-leading-log x (NLLx) accuracy and resums all higher twist contributions within the CGC effec- tive theory. Our work is within the same framework developed for p+A collisions and provides insight into such higher order computations in hadron-hadron collisions [3]. We observe that our result is sensitive to all- twist dipole and quadrupole fundamental Wilson-line correlators in the nucleus. In the leading twist limit, we obtain the k⊥ and collinear fac- torized expressions which match the dominant NLO and NNLO small x perturbative QCD contributions. In particular, our result in the collinear limit is directly proportional to the nuclear gluon distribution. In the soft photon limit, we extract the NLO cross-section for inclusive DIS and compare these to existing results [2] in the literature.
