Gravitational form factors of the nucleon and their mechanical structure: Twist-2 case
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| Format: | Preprint |
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2025
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| _version_ | 1866910898971475968 |
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| author | Kim, Hyun-Chul Kim, June-Young Won, Ho-Yeon |
| author_facet | Kim, Hyun-Chul Kim, June-Young Won, Ho-Yeon |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_23008 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Gravitational form factors of the nucleon and their mechanical structure: Twist-2 case Kim, Hyun-Chul Kim, June-Young Won, Ho-Yeon High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice 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. |
| title | Gravitational form factors of the nucleon and their mechanical structure: Twist-2 case |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice |
| url | https://arxiv.org/abs/2503.23008 |