Work

Gravitational form factors of the nucleon and their mechanical structure: Twist-2 case

Year: 2025

Type: conference-paper

Abstract: We present a series of recent works on the gravitational form factors (GFFs) of the nucleon within a pion mean-field approach, which is also called the chiral quark-soliton model. We investigate the flavor structure of the mass, angular momentum, and $D$-term form factors of the nucleon. The main findings of the present work are given as follows: the contribution of the strange quark is rather small for the mass and angular momentum form factors, it plays an essential role in the $D$-term form factors. It indicates that the $D$-term form factor is sensitive to the outer part of the nucleon. The flavor blindness, i.e, $D^{u-d}\simeq 0$, is valid only if the strange quark is considered. We also discuss the effects of twist-4 operators. Though the gluonic contributions are suppressed by the packing fraction of the instanton vacuum in the twist-2 case, contributions from twist-4 operators are significant.

DOI: 10.22323/1.483.0074

Authors: Hyun-Chul Kim, June-Young Kim, Ho-Yeon Won

Institutions: Inha University, Thomas Jefferson National Accelerator Facility, Centre National de la Recherche Scientifique, École Polytechnique, Institut Polytechnique de Paris

Language: English

Topic: Quantum Chromodynamics and Particle Interactions

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Funders: U.S. Department of Energy, National Research Foundation, Ministère de l'Europe et des Affaires Étrangères, National Research Foundation of Korea, Ministry of Education, Science and Technology, Campus France, Office of Science, Nuclear Physics

Awards: G1728142190, G1773387539, G1848180026, G1883778784, G212335709, G2263355576, G2436857590, G2689675225, G2988778103, G3513891217, G3518886221, G6427981414, G6674091005, G8418628108

OpenAlex ID: W4415516717

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