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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2605.10167 |
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| _version_ | 1866913161009954816 |
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| author | Zhang, Liang Zhang, Song Sun, Kai-Jia Ma, Yu-Gang |
| author_facet | Zhang, Liang Zhang, Song Sun, Kai-Jia Ma, Yu-Gang |
| contents | Measurement of particle emission source is a fundamental objective of femtoscopy in high-energy nuclear collisions. Conventional analyses rely on Gaussian parameterizations of pair emission sources, which makes the extraction of single-particle emission sources challenging, particularly for rare particles. Here, we introduce a novel Statistical Reconstruction method that allows extracting information of target single-particle sources relative to a data-constrained reference source instead of the Gaussian assumption. The correlation function is expressed as an ensemble average over single-particle-conditioned correlation kernel, defined as the particle-by-particle contribution to the correlation function conditioned by the target particles. For particles with rare yeilds, the particle-by-particle distribution of this kernel can be transformed into event-by-event extraction and becomes experimentally accessible, enabling a direct statistical reconstruction of the single-particle emission source, instead of inferring a pair source. We apply this method to reconstruct $J/ψ$ source via $p-J/ψ$ correlations, using HAL QCD-derived $NJ/ψ$ potentials in $\sqrt{s}=13.6$~TeV $pp$ collisions simulated with EPOS4HQ. The reconstructed source reproduces the key characteristics and this new approche achieves a systematic uncertainty of approximately $13\%$ based on EPOS4 simulation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_10167 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Reconstructing rare particle source by femtoscopic correlations Zhang, Liang Zhang, Song Sun, Kai-Jia Ma, Yu-Gang High Energy Physics - Phenomenology Measurement of particle emission source is a fundamental objective of femtoscopy in high-energy nuclear collisions. Conventional analyses rely on Gaussian parameterizations of pair emission sources, which makes the extraction of single-particle emission sources challenging, particularly for rare particles. Here, we introduce a novel Statistical Reconstruction method that allows extracting information of target single-particle sources relative to a data-constrained reference source instead of the Gaussian assumption. The correlation function is expressed as an ensemble average over single-particle-conditioned correlation kernel, defined as the particle-by-particle contribution to the correlation function conditioned by the target particles. For particles with rare yeilds, the particle-by-particle distribution of this kernel can be transformed into event-by-event extraction and becomes experimentally accessible, enabling a direct statistical reconstruction of the single-particle emission source, instead of inferring a pair source. We apply this method to reconstruct $J/ψ$ source via $p-J/ψ$ correlations, using HAL QCD-derived $NJ/ψ$ potentials in $\sqrt{s}=13.6$~TeV $pp$ collisions simulated with EPOS4HQ. The reconstructed source reproduces the key characteristics and this new approche achieves a systematic uncertainty of approximately $13\%$ based on EPOS4 simulation. |
| title | Reconstructing rare particle source by femtoscopic correlations |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2605.10167 |