The turn-on of high energy hadron colliders, such as RHIC and the LHC, have created a new arena for the study of TMDs. The collisions of protons over a wide range of center-of-mass energies allow for tests of universality and factorization as well as the study of evolution effects. The wide-acceptance and variety of technologies featured in typical collider detectors have paved the way for...
In this talk, I will summarize the TMDs from the Collins-Soper-Sterman Resummation formalism. Phenomenological results from recent global analysis of ResBos approach will also be presented, including the TMDs and the associated Collins-Soper evolution kernel.
In this talk we will provide a survey of three fundamental objects: quasi-TMDPDF, quasi-LFWF amplitudes and (quark non-singlet) quasi-PDF matching kernel that appears naturally in the application of LaMET to lattice calculation of various parton distribution functions. We demonstrate how TMD factorization or threshold factorization works for the corresponding objects with a common perturbative...
I review the latest progress in the determination of Collins-Soper kernel. There are two main subjects to be discussed. The first one is the recent N4LL global analysis of the Drell-Yan data, which provides a very precise control of the evolution due a huge span of energies (from 4 GeV to 1000 GeV). The second one is the determination of the Collins-Soper kernel from the twist-three TMD distributions.
We present a first calculation of the unpolarized proton’s isovector transverse-momentumdependent parton distribution functions (TMDPDFs) from lattice QCD, which are essential to predict observables of multi-scale, semi-inclusive processes in the standard model. We use a Nf = 2 + 1 + 1 MILC ensemble with valence clover fermions on a highly improved staggered quark sea (HISQ) to compute the...
Two-particle azimuthal correlations provide valuable insights into the dynamics of gluon saturation in collider experiments. In the kinematic regime where the two particles are produced sufficiently forward in rapidity but back-to-back in the transverse plane, the differential cross-section computed in the Color Glass Condensate (CGC) EFT, admits a small-x Transverse Momentum Dependent (TMD)...
We propose semi-inclusive
diffractive deep inelastic scattering (SIDDIS) to investigate the gluon tomography in the nucleon and
nuclei at small-x. The relevant diffractive quark and gluon parton distribution functions (DPDF) are computed in terms of the color dipole S-matrices in the fundamental and adjoint representations. respectively.
Typically, a production of a particle with a small transverse momentum in hadron-hadron collisions is described
by CSS-based TMD factorization at moderate Bjorken $x_B\sim 1$ and by $k_T$-factorization at small $x_B$.
A uniform description valid for all $x_B$ is provided by rapidity-only TMD factorization developed in a series
of recent papers. In this talk, I will discuss two applications:...
