Minkowski space description of the nucleon and pion

by Prof. Tobias Frederico (Instituto Tecnologico de Aeronautica)

Thursday Jan 29, 2026, 10:00 AM → 12:00 PM Asia/Shanghai

C1204 (Physical Sciences Bldg)

Abstract:

I will review the application of few-body methods to explore the structure of light hadrons in Minkowski space. The description of the nucleon and pion are based on the solution of the Bethe-Salpeter equation in Minkowski space built with phenomenological kernels. For the proton, we will show results obtained with the projection onto the light-front of the Faddeev-Bethe-Salpeter equation, including the valence parton distribution and the image of the valence state on the null-plane. The results for the pion structure observables are computed from the solution of the Bethe-Salpeter equation in Minkowski space using the Nakanishi integral representation. Results for the pion charge form factor, including higher Fock-components will be shown, and compared to the valence one. We found that the charge radius of the higher Fock components is about a half femtometer. The image of the pion valence state onto the null-plane will be presented, as well as results for the PDF and transverse momentum distributions. Some future prospects of research along these lines will be provided.

About the speaker:

Prof. Tobias Frederico is a theoretical physicist at the Aeronautical Technological Institute (ITA) in Brazil. He received his Ph.D. in Physics from the University of São Paulo in 1984. His research explores fundamental questions at the interface of strong-interaction physics and quantum many-body theory, with broad interests spanning CP violation, nuclear and hadron structure, and light-front quantum chromodynamics. Prof. Frederico serves on the International Light-Cone Advisory Committee and the editorial board of Few-Body Systems. He has published over 435 papers in journals including PRL, PRD and JHEP, and received more than 7,100+ citations.

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Date and time：Jan 29 (Thursday), 2026, 10:00 - 12:00 
Location：C1204, Physical Sciences Bldg., USTC
Zoom meeting ID: 984 7694 0471
Passcode: 151362