Mechanical structure of the nucleon and the baryon octet: twist-2 case

Won, Ho-Yeon; Kim, Hyun-Chul; Kim, June-Young

doi:10.1007/jhep05(2024)173

Title: Mechanical structure of the nucleon and the baryon octet: twist-2 case

Journal Article · 14 May 2024 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/jhep05(2024)173 · OSTI ID:2352416

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Inha University, Incheon (Korea, Republic of); Polytechnic Institute of Paris, Palaiseau (France)
Inha University, Incheon (Korea, Republic of); Korea Institute for Advanced Study (KIAS), Seoul (Korea, Republic of)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

We investigate the gravitational form factors (GFFs) of the nucleon and the baryon octet, decomposed into their flavor components, utilizing a pion mean-field approach grounded in the large N_c limit of Quantum Chromodynamics (QCD). Our focus is on the contributions from the twist-2 operators to the flavor-triplet and octet GFFs, and we decompose the mass, angular momentum, and D-term form factors of the nucleon into their respective flavors. The strange quark contributions are found to be relatively mild for the mass and angular momentum form factors, while providing significant corrections to the D-term form factor. In the course of examining the flavor decomposition of the GFFs, we uncover that the effects of twist-4 operators play a crucial role. While the gluonic contributions are suppressed by the packing fraction of the instanton vacuum in the twist-2 case, contributions from twist-4 operators are of order unity, necessitating its explicit consideration.

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Research Organization:: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

Sponsoring Organization:: Ministère de l’Europe et des Affaires Étrangères; National Research Foundation of Korea; USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC05-06OR23177

OSTI ID:: 2352416

Report Number(s):: DOE/OR/23177-7228; JLAB-THY-23-3938; arXiv:2310.04670

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 5 Vol. 2024; ISSN 1029-8479

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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