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(1+1) dimensional hydrodynamics for high-energy heavy-ion collisions

机译：高能重离子碰撞的（1 + 1）维流体动力学

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摘要

A (1 + 1)-dimensional hydrodynamical model in the light-cone coordinates is used to describe central heavy-ion collisions at ultrarelativistic bombarding energies. Deviations from Bjorken scaling are taken into account by choosing finite-size profiles for the initial energy density. The sensitivity of fluid-dynamical evolution to the equation of state and the parameters of initial state are investigated. Experimental constraints on the total energy of produced particles are used to reduce the number of model parameters. Spectra of secondary particles are calculated under the assumption that the transition from the hydrodynamical stage to the collisionless expansion of matter occurs at a certain freeze-out temperature. An important role of resonances in the formation of observed hadronic spectra is demonstrated. The calculated rapidity distributions of pions, kaons, and antiprotons in central Au + Au collisions at root(NN)-N-s = 200 GeV are compared with experimental data of the BRAHMS Collaboration. Parameters of the initial state are reconstructed for different choices of the equation of state. The best fit of these data is obtained for a soft equation of state and Gaussian-like initial profiles of the energy density, intermediate between the Landau and Bjorken limits.
机译：利用光锥坐标中的（1 + 1）维流体动力学模型来描述超相对论轰击能量下的重离子中心碰撞。通过为初始能量密度选择有限尺寸的分布，可以考虑到与Bjorken标度的偏差。研究了流体动力学演化对状态方程和初始状态参数的敏感性。对产生的粒子的总能量的实验约束用于减少模型参数的数量。假设在一定的冻结温度下发生了从流体动力学阶段到物质的无碰撞膨胀的转变，从而计算出次级粒子的光谱。证明了共振在观察到的强子光谱的形成中的重要作用。将计算得出的根（NN）-N-s = 200 GeV的中心Au + Au碰撞中的离子，钾和反质子的快速分布与BRAHMS协作的实验数据进行了比较。针对状态方程的不同选择，重构初始状态的参数。这些数据的最佳拟合是在Landau和Bjorken极限之间的中间状态和能量密度的高斯式初始曲线的软方程式中获得的。

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