Single spin asymmetry in forward $pA$ collisions from Pomeron-Odderon interference
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866912486845841408 |
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| author | Benić, Sanjin Vivoda, Eric Andreas |
| author_facet | Benić, Sanjin Vivoda, Eric Andreas |
| contents | Working in the hybrid framework of the high energy $pA$ collisions we identify a new contribution to transverse single spin asymmetry (SSA). The phase necessary for the SSA is provided by the Pomeron-Odderon interference in the dense nuclear target. The complete formula for the $pA \to h X$ polarized cross section also contains the transversity distribution for the polarized projectile as well as the real part of the twist-3 fragmentation function. We numerically estimate the asymmetry $A_N$ and its nuclear dependence. Based on a model computation we find that $A_N$ can be a percent level in the forward and low-$P_{h\perp}$ region. For large nuclei we find significant suppression, with $A_N \propto A^{-7/6}$ parametrically. As a notable feature we find a node of $A_N$ as a function of the $P_{h\perp}$ around the values of the initial saturation scale that could be used to test this mechanism experimentally. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_12847 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Single spin asymmetry in forward $pA$ collisions from Pomeron-Odderon interference Benić, Sanjin Vivoda, Eric Andreas High Energy Physics - Phenomenology Working in the hybrid framework of the high energy $pA$ collisions we identify a new contribution to transverse single spin asymmetry (SSA). The phase necessary for the SSA is provided by the Pomeron-Odderon interference in the dense nuclear target. The complete formula for the $pA \to h X$ polarized cross section also contains the transversity distribution for the polarized projectile as well as the real part of the twist-3 fragmentation function. We numerically estimate the asymmetry $A_N$ and its nuclear dependence. Based on a model computation we find that $A_N$ can be a percent level in the forward and low-$P_{h\perp}$ region. For large nuclei we find significant suppression, with $A_N \propto A^{-7/6}$ parametrically. As a notable feature we find a node of $A_N$ as a function of the $P_{h\perp}$ around the values of the initial saturation scale that could be used to test this mechanism experimentally. |
| title | Single spin asymmetry in forward $pA$ collisions from Pomeron-Odderon interference |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2501.12847 |