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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2509.24889 |
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| _version_ | 1866918150676676608 |
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| author | Wan, Jie Wang, Chun-Zheng Ma, Yu-Gang Shou, Qi-Ye |
| author_facet | Wan, Jie Wang, Chun-Zheng Ma, Yu-Gang Shou, Qi-Ye |
| contents | The observable $v_0(\pt)$, which quantifies event-by-event fluctuations in the differential transverse-momentum spectrum, is proposed as a direct and penetrating probe of radial flow in heavy-ion collisions. Recent measurements at the LHC exhibit a clear mass ordering for pions, kaons and protons at low \pt and a baryon-meson splitting at intermediate \pt, resembling to the well-known features of elliptic flow ($v_2$). In this letter, we first derive an analytic expression of $v_0(\pt)$ within a Blast-Wave framework incorporating fluctuations of freeze-out temperature and radial expansion velocity, which can naturally explains the experimentally observed mass ordering. The distinct dynamical origins of the mass ordering in $v_0(\pt)$ and $v_2(\pt)$ are discussed. Furthermore, using the AMPT model, we demonstrate that the baryon-meson splitting emerges spontaneously from the quark coalescence. This study provides deeper insight into the $v_0(\pt)$ observable and the collective dynamics of the QGP. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_24889 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Tracing pT-differential radial flow from blast-wave analytics to quark coalescence Wan, Jie Wang, Chun-Zheng Ma, Yu-Gang Shou, Qi-Ye Nuclear Theory The observable $v_0(\pt)$, which quantifies event-by-event fluctuations in the differential transverse-momentum spectrum, is proposed as a direct and penetrating probe of radial flow in heavy-ion collisions. Recent measurements at the LHC exhibit a clear mass ordering for pions, kaons and protons at low \pt and a baryon-meson splitting at intermediate \pt, resembling to the well-known features of elliptic flow ($v_2$). In this letter, we first derive an analytic expression of $v_0(\pt)$ within a Blast-Wave framework incorporating fluctuations of freeze-out temperature and radial expansion velocity, which can naturally explains the experimentally observed mass ordering. The distinct dynamical origins of the mass ordering in $v_0(\pt)$ and $v_2(\pt)$ are discussed. Furthermore, using the AMPT model, we demonstrate that the baryon-meson splitting emerges spontaneously from the quark coalescence. This study provides deeper insight into the $v_0(\pt)$ observable and the collective dynamics of the QGP. |
| title | Tracing pT-differential radial flow from blast-wave analytics to quark coalescence |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2509.24889 |