تقرير
Quantification of the low-$p_{\rm T}$ pion excess in heavy-ion collisions at the LHC and top RHIC energy
| العنوان: | Quantification of the low-$p_{\rm T}$ pion excess in heavy-ion collisions at the LHC and top RHIC energy |
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| المؤلفون: | Lu, Pengzhong, Kavak, Rafet, Dubla, Andrea, Masciocchi, Silvia, Selyuzhenkov, Ilya |
| سنة النشر: | 2024 |
| المجموعة: | High Energy Physics - Phenomenology |
| مصطلحات موضوعية: | High Energy Physics - Phenomenology |
| الوصف: | A Bayesian inference analysis is performed to quantify the pion excess in the low transverse momentum ($p_{\rm T}$) regime in heavy-ion collisions. This quantification is conducted across centrality classes and collision systems at the LHC and top RHIC energy. The analysis is based on the relativistic fluid dynamics description of $p_{\rm T}$ spectra of identified charged hadrons. A $p_{\rm T}$ range scan investigation to determine the optimal range for the pion $p_{\rm T}$ spectra with respect to a fluid dynamic description is performed, finding 0.5~$< p_{\rm T} < $~2.0~GeV$/c$. A significant low-$p_{\rm T}$ pion excess is computed across all centrality classes and collision systems investigated, indicating that a clear low-$p_{\rm T}$ component arises from different physics mechanisms, rather than thermal production. Further comparison with measurements by the PHOBOS Collaboration confirms the persistence of the pion excess into very low-$p_{\rm T}$, with no enhancement observed in kaons and protons within the current experimental precision. Comment: 9 pages, 6 figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2407.09207 |
| رقم الأكسشن: | edsarx.2407.09207 |
| قاعدة البيانات: | arXiv |
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