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arXiv 2407.09207hep-ph
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LHC和RHIC最高能量重离子碰撞中低$p_{\rm T}$π介子超出的定量分析

Quantification of the low-$p_{\rm T}$ pion excess in heavy-ion collisions at the LHC and top RHIC energy

Pengzhong Lu, Rafet Kavak, Andrea Dubla, Silvia Masciocchi, Ilya Selyuzhenkov

备注：
9 pages, 6 figures
发表信息：
NUCL SCI TECH 36, 142 (2025)
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AI总结：

本文利用贝叶斯推断和Fluid${\it u}$M流体框架分析RHIC与LHC重离子碰撞数据，定量确认低横动量区π介子产出超出，并为模型缺失成分或新产生机制提供证据。

摘要：

尽管相对论重离子碰撞中末态强子的丰度已能由热粒子产生机制较好描述，但在横动量$p_{\rm T}$低于约500 MeV$/c$区间内，$p_{\rm T}$分布的形状仍缺乏充分理解。我们提出一种利用贝叶斯推断技术量化模型与数据差异的流程，该流程能够一致地处理实验不确定性，并检验现有流体动力学框架的完备性。采用结合PCE、\trento初始条件和FastReso衰变的相对论流体框架Fluid${\it u}$M，我们分析了在RHIC最高能量和LHC能量下重离子碰撞中测得的鉴别带电强子的$p_{\rm T}$分布，并发现在$p_{\rm T}$低于约500 MeV$/c$时存在π介子产出超出。我们的结果为解释该π介子超出提供了新的依据：它既可能表示热粒子产额描述中缺失的组成部分，也可能作为存在另一种粒子产生机制的证据。

英文摘要：

While the abundances of the final state hadrons in relativistic heavy-ion collisions are rather well described by the thermal particle production, the shape of the transverse momentum, $p_{\rm T}$, distribution below $p_{\rm T}\approx500$ MeV$/c$, is still poorly understood. We propose a procedure to quantify the model-to-data differences using Bayesian inference techniques, which allows for consistent treatment of the experimental uncertainties and tests the completeness of the available hydrodynamic frameworks. Using relativistic fluid framework Fluid${\it u}$M with PCE coupled to \trento initial state and FastReso decays, we analyse \pt distribution of identified charged hadrons measured in heavy-ion collisions at top RHIC and the LHC energies, and identify an excess of pions produced below $p_{\rm T}\approx500$ MeV$/c$. Our results provide new input for the interpretation of the pion excess as either missing components in the thermal particle yield description or as an evidence for a different particle production mechanism.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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