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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2501.18347 |
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| _version_ | 1866918006549905408 |
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| author | Perepelitsa, Dennis V. |
| author_facet | Perepelitsa, Dennis V. |
| contents | Di-hadron and di-jet correlation measurements in proton-nucleus ($p$+A) and electron--nucleus collisions are widely motivated as sensitive probes of novel, non-linear QCD saturation dynamics in hadrons, which are particularly accessible in the dense nuclear environment at low values of Bjorken-$x$ ($x_\mathrm{A})$. Current measurements at RHIC and the LHC observe a significant suppression in the per-trigger yield at forward rapidities compared to that in proton-proton collisions, nominally consistent with the "mono-jet" production expected in a saturation scenario. However, the width of the azimuthal correlation remains unmodified, in contradiction to the qualitative expectations from this physics picture. I investigate whether the construction of these observables leaves them sensitive to effects from simple nuclear shadowing as captured by, for example, universal nuclear parton distribution function (nPDF) analyses. I find that modern nPDF sets, informed by recent precision measurements sensitive to the shadowing of low-$x_\mathrm{A}$ gluon densities in LHC and other data, can describe all or the majority of the di-hadron/jet suppression effects in $p$+A data at both RHIC and the LHC, while giving a natural explanation for why the azimuthal correlation width is unmodified. Notably, this is achieved via a $(x_\mathrm{A},Q^2)$-differential suppression of overall cross-sections only, without requiring additional physics dynamics which alter the inter-event correlations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_18347 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Description of di-hadron saturation signals within a universal nuclear parton distribution function approach Perepelitsa, Dennis V. Nuclear Theory Nuclear Experiment Di-hadron and di-jet correlation measurements in proton-nucleus ($p$+A) and electron--nucleus collisions are widely motivated as sensitive probes of novel, non-linear QCD saturation dynamics in hadrons, which are particularly accessible in the dense nuclear environment at low values of Bjorken-$x$ ($x_\mathrm{A})$. Current measurements at RHIC and the LHC observe a significant suppression in the per-trigger yield at forward rapidities compared to that in proton-proton collisions, nominally consistent with the "mono-jet" production expected in a saturation scenario. However, the width of the azimuthal correlation remains unmodified, in contradiction to the qualitative expectations from this physics picture. I investigate whether the construction of these observables leaves them sensitive to effects from simple nuclear shadowing as captured by, for example, universal nuclear parton distribution function (nPDF) analyses. I find that modern nPDF sets, informed by recent precision measurements sensitive to the shadowing of low-$x_\mathrm{A}$ gluon densities in LHC and other data, can describe all or the majority of the di-hadron/jet suppression effects in $p$+A data at both RHIC and the LHC, while giving a natural explanation for why the azimuthal correlation width is unmodified. Notably, this is achieved via a $(x_\mathrm{A},Q^2)$-differential suppression of overall cross-sections only, without requiring additional physics dynamics which alter the inter-event correlations. |
| title | Description of di-hadron saturation signals within a universal nuclear parton distribution function approach |
| topic | Nuclear Theory Nuclear Experiment |
| url | https://arxiv.org/abs/2501.18347 |