Functional renormalization group study of the jet quenching parameter near the QCD critical end point
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866913172191969280 |
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| author | Huang, Yi-zhen Yin, Shi Han, Sheng-nan Wu, Jing Li, Feng Fu, Wei-jie |
| author_facet | Huang, Yi-zhen Yin, Shi Han, Sheng-nan Wu, Jing Li, Feng Fu, Wei-jie |
| contents | We investigate the jet quenching parameter $\hat{q}$ in the QCD phase diagram within a QCD-assisted low-energy effective theory using the functional renormalization group (fRG). Following the formalism that relates $\hat{q}$ to the spectral functions of the chiral order-parameter field, we compute the $σ$ and $π$ meson contributions to $\hat{q}$ at finite temperature and baryon chemical potential from analytically continued mesonic two-point functions. We find that $\hat{q}$ receives appreciable contributions mainly above the chiral phase boundary and exhibits a pronounced enhancement at large baryon chemical potential as the chiral crossover sharpens toward the critical end point (CEP), a behavior consistent with the picture of partonic critical opalescence (PCO), a pronounced enhancement of jet transverse momentum broadening induced by the critical $σ$ field fluctuations. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_30816 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Functional renormalization group study of the jet quenching parameter near the QCD critical end point Huang, Yi-zhen Yin, Shi Han, Sheng-nan Wu, Jing Li, Feng Fu, Wei-jie High Energy Physics - Phenomenology Nuclear Theory We investigate the jet quenching parameter $\hat{q}$ in the QCD phase diagram within a QCD-assisted low-energy effective theory using the functional renormalization group (fRG). Following the formalism that relates $\hat{q}$ to the spectral functions of the chiral order-parameter field, we compute the $σ$ and $π$ meson contributions to $\hat{q}$ at finite temperature and baryon chemical potential from analytically continued mesonic two-point functions. We find that $\hat{q}$ receives appreciable contributions mainly above the chiral phase boundary and exhibits a pronounced enhancement at large baryon chemical potential as the chiral crossover sharpens toward the critical end point (CEP), a behavior consistent with the picture of partonic critical opalescence (PCO), a pronounced enhancement of jet transverse momentum broadening induced by the critical $σ$ field fluctuations. |
| title | Functional renormalization group study of the jet quenching parameter near the QCD critical end point |
| topic | High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2605.30816 |