QNP2024 - The 10th International Conference on Quarks and Nuclear Physics

Lattice QCD determination of unpolarized TMDPDFs of the nucleon

10 Jul 2024, 16:30

25m

Aula M3 (Facultat de Biologia)

Leading contributed talk C. Hadron Structure

Speaker

Qi-An Zhang (Beihang University)

Description

We present a first calculation of the unpolarized proton's isovector transverse-momentum-dependent 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 $N_f=2+1+1$ MILC ensemble with valence clover fermions on a highly improved staggered quark sea (HISQ) to compute the quark momentum distributions in large-momentum protons on the lattice. The state-of-the-art techniques in renormalization and extrapolation in the correlation distance on the lattice are adopted. The one-loop contributions in the perturbative matching kernel to the light-cone TMDPDFs are taken into account, and the dependence on the pion mass and hadron momentum is explored.
Our results are qualitatively comparable with phenomenological TMDPDFs, which provide an opportunity to predict high energy scatterings from the first principles.

Presentation materials

Qi-An Zhang.pdf