Photoproduction of three jets in the CGC: gluon TMDs and dilute limit
Résumé
We study the process γA →$ q\overline{q}g $ + X in the Color Glass Condensate (CGC) effective theory. After obtaining the cross section, we consider two kinematic limits which are encompassed in our result. In the so-called correlation limit, the vector sum of the transverse momenta of the three outgoing particles is small with respect to the individual transverse momenta; the cross section then simplifies considerably and can be written in a factorized form, sensitive to both the unpolarized and linearly-polarized Weizsäcker-Williams transverse momentum dependent gluon distribution function (gluon TMD). The second limit of the CGC cross section that we consider is the dilute limit, which we obtain after performing a weak-field expansion; we recover a typical linear-regime expression, involving a single unintegrated gluon distribution function. Using numerical simulations of the small-x QCD evolution of the TMDs, we investigate the rapidity dependence of the cross section in the correlation limit.
Mots clés
Heavy Ion Phenomenology
photon nucleus: scattering
gluon: distribution function
cross section: rapidity dependence
expansion: weak field
color glass condensate
transverse momentum
correlation
transverse momentum dependence
quantum chromodynamics
numerical calculations
jet: photoproduction
kinematics