Directed flow from parton spin-orbit coupling in $pp$ and $pA$ collisions
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arXiv
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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866915390453448704 |
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| author | Benić, Sanjin Hatta, Yoshitaka |
| author_facet | Benić, Sanjin Hatta, Yoshitaka |
| contents | We point out a novel mechanism to generate $\cos ϕ$ two-particle azimuthal correlation (`directed flow') in unpolarized proton-proton and proton-nucleus collisions in the forward rapidity region of the projectile proton. This is a direct consequence of the recently discovered strong spin-orbit coupling in gluons at small-$x$. The observable simultaneously serves as a unique probe into the double helicity parton distribution functions of the proton. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_05172 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Directed flow from parton spin-orbit coupling in $pp$ and $pA$ collisions Benić, Sanjin Hatta, Yoshitaka High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Experiment Nuclear Theory We point out a novel mechanism to generate $\cos ϕ$ two-particle azimuthal correlation (`directed flow') in unpolarized proton-proton and proton-nucleus collisions in the forward rapidity region of the projectile proton. This is a direct consequence of the recently discovered strong spin-orbit coupling in gluons at small-$x$. The observable simultaneously serves as a unique probe into the double helicity parton distribution functions of the proton. |
| title | Directed flow from parton spin-orbit coupling in $pp$ and $pA$ collisions |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2505.05172 |