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May 20 – 24, 2018
Drury Plaza Hotel
US/Mountain timezone

Inclusive prompt photon production in e + A DIS at small x as a probe of gluon saturation

May 20, 2018, 5:00 PM
O'Keefe Ballroom (Drury Plaza Hotel)

O'Keefe Ballroom

Drury Plaza Hotel

828 Paseo de Peralta, Santa Fe, New Mexico 87501


Kaushik Roy (Stony Brook University)


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.

Presentation materials