介子热模型中馈降介子的相关性
Correlations of Feed-down Hadrons in a Thermal Model
AI总结：
该研究通过热介子气体模型探讨强衰变对净量子数波动和平衡函数的影响，揭示了衰变对测量结果的显著作用。
摘要：
我们基于一个热介子气体模型，研究强衰变对净量子数波动幅度和平衡函数积分的潜在影响。计算基于一组已知介子的完整列表，其质量最高可达2.5 GeV/$c^2$，并包括所有已知分支比的衰变过程。计算在零重子化学势、温度介于140至200 MeV之间的情况下进行。我们证明，衰变显著影响可测量的“稳定粒子”的单产以及这些物种的相关密度。衰变可能对净量子数累积量和平衡函数的测量产生大而非平凡的影响。这些观察在寻找RHIC束能扫描中的QCD临界点以及确定RHIC或LHC能量附近相变处的化学不稳定性方面尤为重要。本工作所得结果也揭示了在基本p-p和核-核碰撞中测量平衡函数时，馈降的重要性。
英文摘要：
We examine the potential impact of strong decays on the magnitude of fluctuations of net quantum numbers and integrals of balance functions based on a thermal hadron gas model. The calculations are based on a comprehensive list of known hadrons with masses up to 2.5 GeV/$c^2$ and include all decays of these hadrons with known branching fractions. The calculations are performed at vanishing baryo-chemical potential for temperatures between 140 and 200 MeV. We show that the decays feed-down substantially impact the single yield of measurable ``stable particles" as well as those of correlated densities of these species. Decays can then potentially have large and non-trivial impacts on measurements of net quantum number cumulants and balance functions. These observations are particularly important in the context of the search for the QCD critical point at the RHIC Beam Energy Scan as well as efforts to determine chemical susceptibilities near the phase transition at RHIC or LHC energies. Results obtained in this work also shed light on the importance of feed-down in measurements of balance functions in elementary p-p and nucleus-nucleus collisions.
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