Comparison of improved TMD and CGC frameworks in forward quark dijet production

• DOI: 10.1007/jhep12(2020)181
• Publication Date: 2020-12-28T22:02:28Z
• Authors: Hirotsugu Fujii; Cyrille Marquet; Kazuhiro Watanabe
• Keywords: Resummation; Color Glass Condensate; Weierstrass factorization theorem

A bstract For studying small- x gluon saturation in forward dijet production high-energy dilute-dense collisions, the improved TMD (ITMD) factorization formula was recently proposed. In Color Glass Condensate (CGC) framework, it represents leading term of an expansion inverse powers hard scale. It contains leading-twist relevant for small gluon’s transverse momentum k t , but also incorporates all-order resummation kinematical twists, resulting a proper matching to at large . this paper, we evaluate accuracy ITMD quantitatively, case quark proton-proton( p + ) and proton-nucleus ( collisions LHC energies. We do so by comparing quark-antiquark azimuthal angle ∆ ϕ distribution that obtained with CGC formula. each much larger than target scale, Q s is good approximation wide range angle. becomes less accurate as jet ’s are lowered, expected, due presence genuine higher-twists contributions which represent multi-body scattering effects absent find that, momenta start deteriorating angles, high-energy-factorization regime, while regime near = π very low values needed see differences between addition, twists corrections become visible higher compared signaling they enhanced