arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2002.07008nucl-thhep-phnucl-ex
收藏

初态涨落对平均横动量的影响

Effects of initial state fluctuations on the mean transverse momentum

Fernando G. Gardim, Giuliano Giacalone, Matthew Luzum, Jean-Yves Ollitrault

摘要:

我们发现,在重离子碰撞的理想流体动力学模拟中,初始状态的涨落导致了出射强子的平均横动量$\langle p_t\rangle$的增加。具体而言,$\langle p_t\rangle$是由几个百分点,如果现实的波动比平滑的初始条件,多重性和碰撞参量保持固定的实施。我们发现,这一结果可以追溯到这样一个事实,即对于给定的总熵,初始能量包含在流体中的密度分布是颠簸较大。我们讨论了这些结果对从实验数据中提取QCD状态方程的意义。

英文摘要:

We show that in ideal hydrodynamic simulations of heavy-ion collisions, initial state fluctuations result in an increase of the mean transverse momentum of outgoing hadrons, $\langle p_t\rangle$. Specifically, $\langle p_t\rangle$ is larger by a few percent if realistic fluctuations are implemented than with smooth initial conditions, the multiplicity and impact parameter being kept fixed. We show that result can be traced back to the fact that for a given total entropy, the initial energy contained in the fluid is larger if the density profile is bumpy. We discuss the implication of these results for the extraction of the equation of state of QCD from experimental data.

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。

↑