[RBRC seminar] Small-x gluon TMD evolution and forward di-hadron correlations
by
2-160
https://bnl.zoomgov.com/j/1600983728?pwd=RAD7OLcqre7Ycsp6JfFp6HAnpyLxex.1
n this seminar I will present progress in understanding two-particle correlations as a probe of saturation dynamics. A key ingredient is understanding the interplay between various evolution equations that lead to important qualitative effects to the correlation.
First, I will discuss our recent next-to-leading order calculation of the Weizsäcker-Williams gluon TMD at small-x encompassing BFKL/JIMWLK, CSS, and DGLAP [2510.08454]. I will illustrate the different regimes of phase space that contribute to these different evolutions. I will briefly outline how this program can be extended to compute all necessary evolution equations for two-particle production in DIS and proton-nucleus collision at small-x.
I will then present a numerical investigation of semi-inclusive forward di-hadron production in the away-side region in proton–nucleus collisions [2512.21466]. Our computation integrates several key elements: i) non-linear rapidity evolution via the Balitsky–Kovchegov equation with running coupling, ii) both perturbative and non-perturbative Sudakov resummation, and iii) a phenomenologically constrained model for the initial conditions for small-x gluon distributions. I will confront our results to experimental data from the STAR Collaboration on azimuthal correlations in forward di-pion production in both proton–proton and proton–gold collisions.