Renormalization-group approach to transverse-momentum dependent parton distribution functions in QCD

Transverse momentum dependent quark densities from Lattice QCD

We study transverse momentum dependent parton distribution functions (TMDs) with non-local operators in lattice QCD, using MILC/LHPC lattices. We discuss the basic concepts of the method, including renormalization of the gauge link. Results obtained with a simplified operator geometry show visible dipole deformations of spin-dependent quark momentum densities.

ترکش گلوئون به چارمونیوم برداری J/psi با در نظر گرفتن اثر تابع موج مزون

Studying the production or decay processes of heavy quarkonia (the bound state of heavy quark-antiquark) is a powerful tool to test our understanding of strong interaction dynamics and QCD theory. Fragmentation is the dominant production mechanism for heavy quarkonia with large transverse momentum. The fragmentation refers to the production process of a parton with high transverse momentum whic...

Nucleon transverse momentum-dependent parton distributions in lattice QCD: Renormalization patterns and discretization effects

Transversity of Quarks and Nucleons in Sidis and Drell Yan

One of the persistent challenges confronting the QCD parton model is the explanation of the significant azimuthal and single spin asymmetries that emerge in inclusive and semi-inclusive processes . Going beyond the collinear approximation in PQCD recent progress has been achieved in characterizing these asymmetries in terms of absorptive scattering . Such asymmetries involve time-reversal-odd (...

Semi-inclusive DIS: Factorization

There has been considerable experimental and theoretical interest in semi-inclusive hadron production in deep inelastic scattering (SIDIS) processes. For example, by studying the polarized and unpolarized SIDIS, one will be able to identify the sea quark distribution and polarization in nucleon, and the experimental results from the HERMES collaboration have revealed nontrivial sea structure in...