Corrections to the Smoothness and On-Shell Approximations in Femtoscopy and Coalescence
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arXiv
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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866912874502291456 |
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| author | Smith, Isaac G. Blum, Kfir |
| author_facet | Smith, Isaac G. Blum, Kfir |
| contents | Relativistic heavy-ion collisions produce femtometer-scale sources whose space-time structure can be constrained using two-particle femtoscopic correlations. Standard implementations rely on the smoothness and on-shell approximations, which effectively remove the relative momentum dependence of the particle emission function. We explore the validity of these approximations by deriving model-independent expansions that quantify the leading corrections for femtoscopy and coalescence with arbitrary sources and final-state interactions. The resulting first- and second-order correction terms can be evaluated with essentially the same numerical complexity as the usual Koonin-Pratt expressions; for angle-averaged correlations the first-order contributions vanish by symmetry. We illustrate the framework with explicit calculations in a blast-wave source model. For parameter sets representative of pp and PbPb fits at LHC energies, the corrections are at or below the percent level for pp correlations and deuteron coalescence. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_02810 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Corrections to the Smoothness and On-Shell Approximations in Femtoscopy and Coalescence Smith, Isaac G. Blum, Kfir Nuclear Theory High Energy Physics - Experiment Nuclear Experiment Relativistic heavy-ion collisions produce femtometer-scale sources whose space-time structure can be constrained using two-particle femtoscopic correlations. Standard implementations rely on the smoothness and on-shell approximations, which effectively remove the relative momentum dependence of the particle emission function. We explore the validity of these approximations by deriving model-independent expansions that quantify the leading corrections for femtoscopy and coalescence with arbitrary sources and final-state interactions. The resulting first- and second-order correction terms can be evaluated with essentially the same numerical complexity as the usual Koonin-Pratt expressions; for angle-averaged correlations the first-order contributions vanish by symmetry. We illustrate the framework with explicit calculations in a blast-wave source model. For parameter sets representative of pp and PbPb fits at LHC energies, the corrections are at or below the percent level for pp correlations and deuteron coalescence. |
| title | Corrections to the Smoothness and On-Shell Approximations in Femtoscopy and Coalescence |
| topic | Nuclear Theory High Energy Physics - Experiment Nuclear Experiment |
| url | https://arxiv.org/abs/2602.02810 |