论文标题
在重离子碰撞中冻结时提取磁场的大小
Extracting the magnitude of magnetic field at freeze-out in heavy-ion collisions
论文作者
论文摘要
强烈的磁场显着影响带电的轻介子的质量。例如，带电的亲质的质量随着磁场的增加而增加。我们提出这种机制是在重离子碰撞中冻结时提取磁场幅度的一种可能方法，从而有助于限制其寿命，这是目前可以解决的主要开放问题。具体而言，我们表明，带电pions的产率与带电的Rhos的产量之间的比率非常敏感到冻结时的磁场值。通过使用粘性流动力框架（IEBE-VISHNU）来模拟重离子碰撞并实现磁场依赖性的介子质量，我们可以计算它们的产量并预测该比率对磁场的依赖性。我们建议将带电的RHO产量与带电的PION产量的比率用作可观察到的实验性观察，以在重离子碰撞中冻结时提取可能的磁场。
A strong magnetic field influences significantly the masses of the charged light mesons. For example, the mass of charged pion increases with the magnetic field increasing. We propose this mechanism as a possible way to extract the magnitude of magnetic field at freeze-out in heavy ion collisions and thus help constrain its lifetime which is currently a major open question to resolve. Specifically we show that the ratio between the yield of charged pions and that of charged rhos is very sensitive to the magnetic field value at freeze-out. By using a viscous-hydrodynamic framework (iEBE-VISHNU) to simulate heavy ion collisions and implementing magnetic-field-dependent meson masses, we compute their yields and predict the dependence of such ratio on the magnetic field. We suggest to use this ratio of charged rho yield over charged pion yield as an experimental observable to extract the possible magnetic field at freeze-out in heavy ion collisions.
