Characterizing the initial state of hydrodynamics in pp and pA collisions
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| Format: | Preprint |
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2025
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| _version_ | 1866914140174417920 |
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| author | Rabelo-Soares, Gabriel Vujanovic, Gojko Torrieri, Giorgio |
| author_facet | Rabelo-Soares, Gabriel Vujanovic, Gojko Torrieri, Giorgio |
| contents | The observation of seeming hydrodynamic-like behavior in proton-proton and proton-nucleus collisions presents us with the conceptual problem of how the initial state of such a hydrodynamic evolution should be characterized. This is an issue because, while nuclei can reasonably be approximated as ``large'' systems w.r.t. the characteristic Fermi momentum of their constituents, this is no longer true for nucleons. Hence, one would need to match a ``quantum'' theory, whose observables are described via highly non-commuting operators, to a ``classical'' hydrodynamics. Operationally assuming a ``fast'' thermalization, we survey what kind of object is best suited to such a matching condition. We show that it cannot be any of the objects usually associated with ``the 3D structure of the nucleon'' but rather a measure associated with entanglement entropy. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2511_03851 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Characterizing the initial state of hydrodynamics in pp and pA collisions Rabelo-Soares, Gabriel Vujanovic, Gojko Torrieri, Giorgio High Energy Physics - Phenomenology Nuclear Theory The observation of seeming hydrodynamic-like behavior in proton-proton and proton-nucleus collisions presents us with the conceptual problem of how the initial state of such a hydrodynamic evolution should be characterized. This is an issue because, while nuclei can reasonably be approximated as ``large'' systems w.r.t. the characteristic Fermi momentum of their constituents, this is no longer true for nucleons. Hence, one would need to match a ``quantum'' theory, whose observables are described via highly non-commuting operators, to a ``classical'' hydrodynamics. Operationally assuming a ``fast'' thermalization, we survey what kind of object is best suited to such a matching condition. We show that it cannot be any of the objects usually associated with ``the 3D structure of the nucleon'' but rather a measure associated with entanglement entropy. |
| title | Characterizing the initial state of hydrodynamics in pp and pA collisions |
| topic | High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2511.03851 |