Gluon dipole factorisation for diffractive dijets

A bstract Within the colour dipole picture for deep inelastic scattering at small Bjorken x , we study the production of a pair of relatively hard jets via coherent diffraction. By “relatively hard” we mean that the transverse momenta of the two jets — the quark ( q ) and the antiquark ( q ¯ ) gener...

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Vydané v:	The journal of high energy physics Ročník 2022; číslo 10; s. 103 - 66
Hlavní autori:	Iancu, E., Mueller, A. H., Triantafyllopoulos, D. N., Wei, S. Y.
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	Berlin/Heidelberg Springer Berlin Heidelberg 17.10.2022 Springer Nature B.V Springer Springer Nature SpringerOpen
Predmet:	Classical and Quantum Gravitation Color Configurations Deep Inelastic Scattering or Small-x Physics Dipoles Elementary Particles Factorization Gluons High energy physics High Energy Physics - Experiment High Energy Physics - Phenomenology Inelastic scattering Jets Jets and Jet Substructure Kinematics Laboratories Nuclear Theory Physics Physics and Astronomy PHYSICS OF ELEMENTARY PARTICLES AND FIELDS Pomerons Quantum Field Theories Quantum Field Theory Quantum Physics Quarks Regular Article - Theoretical Physics Relativity Theory Renormalization Group Saturation String Theory Transverse momentum Renormalization Group Jets and Jet Substructure Factorization Deep Inelastic Scattering or Small-x Physics deep inelastic scattering transverse momentum coherence rapidity: gap photon: virtual Bjorken pomeron dijet: production color: dipole scattering: dipole quark antiquark momentum: saturation color: transparency factorization: collinear diffraction: structure function gluon: jet gluon: saturation
ISSN:	1029-8479, 1126-6708, 1029-8479
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Popis
Shrnutí:	A bstract Within the colour dipole picture for deep inelastic scattering at small Bjorken x , we study the production of a pair of relatively hard jets via coherent diffraction. By “relatively hard” we mean that the transverse momenta of the two jets — the quark ( q ) and the antiquark ( q ¯ ) generated by the decay of the virtual photon — are much larger than the target saturation momentum Q s ( Y ℙ ) evaluated at the rapidity gap Y ℙ . We argue that the typical final-state configurations are such that the hard q q ¯ dijets are accompanied by a semi-hard gluon jet, with a transverse momentum of the order of Q s ( Y ℙ ). The presence of this third jet ensures that the scattering is strong and thus avoids the strong suppression of exclusive (hard) dijet production due to colour transparency. For such “2+1” jet configurations, we demonstrate that both the emission of the semi-hard gluon and its scattering with the hadronic target can be factorised in terms of an effective gluon-gluon dipole. This effective description, originally proposed in [ 1 – 7 ], builds a bridge between the colour dipole picture and the transverse-momentum dependent (TMD) version of the collinear factorisation: the cross-section for diffractive 2+1 jets can be written as the product between a hard factor describing the q q ¯ dijets and a semi-hard factor expressing the unintegrated gluon distribution of the Pomeron. The latter is controlled by gluon dipole scattering in the black disk limit and hence is strongly sensitive to gluon saturation. By integrating out the kinematics of the 3 jets, we obtain the q q ¯ g contribution to the diffractive structure function in collinearly-factorised form.
Bibliografia:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 USDOE Office of Science (SC) FG02-92ER40699
ISSN:	1029-8479 1126-6708 1029-8479
DOI:	10.1007/JHEP10(2022)103