Unveiling the sea: universality of the transverse momentum dependent quark distributions at small $x$
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915785394356224 |
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| author | Caucal, Paul Morales, Marcos Guerrero Iancu, Edmond Salazar, Farid Yuan, Feng |
| author_facet | Caucal, Paul Morales, Marcos Guerrero Iancu, Edmond Salazar, Farid Yuan, Feng |
| contents | Within the Colour Glass Condensate effective theory, we demonstrate that back-to-back dijet correlations in dilute-dense collisions involving a small-$x$ quark from the nuclear target can be factorised in terms of universal transverse momentum dependent distributions (TMDs) for the sea quarks. Two building blocks are needed to construct all these TMDs at the operator level: the sea quark TMD operator which appears in semi-inclusive Deep-Inelastic Scattering (SIDIS) or in the Drell-Yan process and the elastic $S$-matrix for a quark-antiquark dipole. Compared to SIDIS, the saturation effects are stronger for dijet production in forward proton-nucleus collisions, due to additional scattering in the initial and final state, effectively resulting in a larger value for the nuclear saturation momentum. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_16162 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Unveiling the sea: universality of the transverse momentum dependent quark distributions at small $x$ Caucal, Paul Morales, Marcos Guerrero Iancu, Edmond Salazar, Farid Yuan, Feng High Energy Physics - Phenomenology Nuclear Theory Within the Colour Glass Condensate effective theory, we demonstrate that back-to-back dijet correlations in dilute-dense collisions involving a small-$x$ quark from the nuclear target can be factorised in terms of universal transverse momentum dependent distributions (TMDs) for the sea quarks. Two building blocks are needed to construct all these TMDs at the operator level: the sea quark TMD operator which appears in semi-inclusive Deep-Inelastic Scattering (SIDIS) or in the Drell-Yan process and the elastic $S$-matrix for a quark-antiquark dipole. Compared to SIDIS, the saturation effects are stronger for dijet production in forward proton-nucleus collisions, due to additional scattering in the initial and final state, effectively resulting in a larger value for the nuclear saturation momentum. |
| title | Unveiling the sea: universality of the transverse momentum dependent quark distributions at small $x$ |
| topic | High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2503.16162 |