Inclusive prompt photon production in electron-nucleus scattering at small x
Abstract We compute the differential cross-section 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...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2018-05-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | http://link.springer.com/article/10.1007/JHEP05(2018)013 |
| _version_ | 1818285851894874112 |
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| author | Kaushik Roy Raju Venugopalan |
| author_facet | Kaushik Roy Raju Venugopalan |
| author_sort | Kaushik Roy |
| collection | DOAJ |
| description | Abstract We compute the differential cross-section 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 Low-Burnett-Kroll 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 next-to-leading 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 + → ∞. |
| first_indexed | 2024-12-13T01:15:16Z |
| format | Article |
| id | doaj.art-78827530da69406f961b9e96f0ce130a |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-13T01:15:16Z |
| publishDate | 2018-05-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-78827530da69406f961b9e96f0ce130a2022-12-22T00:04:22ZengSpringerOpenJournal of High Energy Physics1029-84792018-05-012018514710.1007/JHEP05(2018)013Inclusive prompt photon production in electron-nucleus scattering at small xKaushik Roy0Raju Venugopalan1Department of Physics and Astronomy, Stony Brook UniversityPhysics Department, Brookhaven National LaboratoryAbstract We compute the differential cross-section 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 Low-Burnett-Kroll 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 next-to-leading 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 + → ∞.http://link.springer.com/article/10.1007/JHEP05(2018)013Deep Inelastic Scattering (Phenomenology)NLO Computations |
| spellingShingle | Kaushik Roy Raju Venugopalan Inclusive prompt photon production in electron-nucleus scattering at small x Journal of High Energy Physics Deep Inelastic Scattering (Phenomenology) NLO Computations |
| title | Inclusive prompt photon production in electron-nucleus scattering at small x |
| title_full | Inclusive prompt photon production in electron-nucleus scattering at small x |
| title_fullStr | Inclusive prompt photon production in electron-nucleus scattering at small x |
| title_full_unstemmed | Inclusive prompt photon production in electron-nucleus scattering at small x |
| title_short | Inclusive prompt photon production in electron-nucleus scattering at small x |
| title_sort | inclusive prompt photon production in electron nucleus scattering at small x |
| topic | Deep Inelastic Scattering (Phenomenology) NLO Computations |
| url | http://link.springer.com/article/10.1007/JHEP05(2018)013 |
| work_keys_str_mv | AT kaushikroy inclusivepromptphotonproductioninelectronnucleusscatteringatsmallx AT rajuvenugopalan inclusivepromptphotonproductioninelectronnucleusscatteringatsmallx |