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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2409.18078 |
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| _version_ | 1866910621489954816 |
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| author | Bacchetta, Alessandro Bongallino, Alessia Cerutti, Matteo Radici, Marco Rossi, Lorenzo |
| author_facet | Bacchetta, Alessandro Bongallino, Alessia Cerutti, Matteo Radici, Marco Rossi, Lorenzo |
| contents | By analyzing experimental data on semi-inclusive deep inelastic scattering off longitudinally polarized targets, we extract the transverse momentum dependence of the quark helicity distribution, i.e., the difference between the three-dimensional motion of quarks with polarization parallel or antiparallel to the longitudinal polarization of the parent hadron. We perform the analysis at next-to-leading (NLL) and next-to-next-to-leading (NNLL) perturbative accuracy. The quality of the fit is very good for both cases, reaching a $χ^2$ per number of data points equal to $1.11$ and $1.09$, respectively. Although the limited number of data points leads to significant uncertainties, the data are consistent with an interpretation in which the helicity distribution is narrower in transverse momentum than the unpolarized distribution. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_18078 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Exploring the three-dimensional momentum distribution of longitudinally polarized quarks in the proton Bacchetta, Alessandro Bongallino, Alessia Cerutti, Matteo Radici, Marco Rossi, Lorenzo High Energy Physics - Phenomenology By analyzing experimental data on semi-inclusive deep inelastic scattering off longitudinally polarized targets, we extract the transverse momentum dependence of the quark helicity distribution, i.e., the difference between the three-dimensional motion of quarks with polarization parallel or antiparallel to the longitudinal polarization of the parent hadron. We perform the analysis at next-to-leading (NLL) and next-to-next-to-leading (NNLL) perturbative accuracy. The quality of the fit is very good for both cases, reaching a $χ^2$ per number of data points equal to $1.11$ and $1.09$, respectively. Although the limited number of data points leads to significant uncertainties, the data are consistent with an interpretation in which the helicity distribution is narrower in transverse momentum than the unpolarized distribution. |
| title | Exploring the three-dimensional momentum distribution of longitudinally polarized quarks in the proton |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2409.18078 |