Inclusive prompt photon production in electronnucleus scattering at small x
Here, we compute the differential crosssection for inclusive prompt photon production in deeply inelastic scattering (DIS) of electrons on nuclei at small x in the framework of the Color Glass Condensate (CGC) effective theory. The leading order (LO) computation in this framework resums leading logarithms in x as well as power corrections to all orders in Q _{s,A} ^{2} /Q ^{2}, where Q _{s,A}(x) is the nuclear saturation scale. This LO result is proportional to universal dipole and quadrupole Wilson line correlators in the nucleus. In the soft photon limit, the LowBurnettKroll theorem allows us to recover existing results on inclusive DIS dijet production. The k⊥ and collinearly factorized expressions for prompt photon production in DIS are also recovered in a leading twist approximation to our result. In the latter case, our result corresponds to the dominant nexttoleading order (NLO) perturbative QCD contribution at small x. We next discuss the computation of the NLO corrections to inclusive prompt photon production in the CGC framework. In particular, we emphasize the advantages for higher order computations in inclusive photon production, and for fully inclusive DIS, arising from the simple momentum space structure of the dressed quark and gluon “shock wave” propagators inmore »
 Authors:

^{[1]}
;
^{[2]}
 Stony Brook Univ., Stony Brook, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
 Brookhaven National Lab. (BNL), Upton, NY (United States)
 Publication Date:
 Report Number(s):
 BNL2078662018JAAM
Journal ID: ISSN 10298479
 Grant/Contract Number:
 SC0012704
 Type:
 Accepted Manuscript
 Journal Name:
 Journal of High Energy Physics (Online)
 Additional Journal Information:
 Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2018; Journal Issue: 5; Journal ID: ISSN 10298479
 Publisher:
 Springer Berlin
 Research Org:
 Brookhaven National Laboratory (BNL), Upton, NY (United States)
 Sponsoring Org:
 USDOE Office of Science (SC), Nuclear Physics (NP) (SC26)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Deep Inelastic Scattering (Phenomenology); NLO Computations
 OSTI Identifier:
 1462427
Roy, Kaushik, and Venugopalan, Raju. Inclusive prompt photon production in electronnucleus scattering at small x. United States: N. p.,
Web. doi:10.1007/JHEP05(2018)013.
Roy, Kaushik, & Venugopalan, Raju. Inclusive prompt photon production in electronnucleus scattering at small x. United States. doi:10.1007/JHEP05(2018)013.
Roy, Kaushik, and Venugopalan, Raju. 2018.
"Inclusive prompt photon production in electronnucleus scattering at small x". United States.
doi:10.1007/JHEP05(2018)013. https://www.osti.gov/servlets/purl/1462427.
@article{osti_1462427,
title = {Inclusive prompt photon production in electronnucleus scattering at small x},
author = {Roy, Kaushik and Venugopalan, Raju},
abstractNote = {Here, we compute the differential crosssection for inclusive prompt photon production in deeply inelastic scattering (DIS) of electrons on nuclei at small x in the framework of the Color Glass Condensate (CGC) effective theory. The leading order (LO) computation in this framework resums leading logarithms in x as well as power corrections to all orders in Q s,A 2 /Q2, where Qs,A(x) is the nuclear saturation scale. This LO result is proportional to universal dipole and quadrupole Wilson line correlators in the nucleus. In the soft photon limit, the LowBurnettKroll theorem allows us to recover existing results on inclusive DIS dijet production. The k⊥ and collinearly factorized expressions for prompt photon production in DIS are also recovered in a leading twist approximation to our result. In the latter case, our result corresponds to the dominant nexttoleading order (NLO) perturbative QCD contribution at small x. We next discuss the computation of the NLO corrections to inclusive prompt photon production in the CGC framework. In particular, we emphasize the advantages for higher order computations in inclusive photon production, and for fully inclusive DIS, arising from the simple momentum space structure of the dressed quark and gluon “shock wave” propagators in the “wrong” light cone gauge A– = 0 for a nucleus moving with P N+ → ∞.},
doi = {10.1007/JHEP05(2018)013},
journal = {Journal of High Energy Physics (Online)},
number = 5,
volume = 2018,
place = {United States},
year = {2018},
month = {5}
}