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arXiv 0907.4256nucl-th
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椭圆流的能量依赖性能否揭示QGP的相变?

Can the energy dependence of elliptic flow reveal the QGP phase transition?

Ulrich W Heinz

摘要:

利用理想流体动力学模拟计算了强子谱随碰撞能的演化以及AGS和LHC能量之间的椭圆流。我们认为,粘性效应应减少增加能量,提高适用性的理想流体动力学在更高的能量。结果表明,随着碰撞能量的增加,在较高能量下径向流的增加会将椭圆流推向较大的横向动量,从而导致椭圆流在p_T不变的情况下随碰撞能量的增加而出现峰值并随后减小,而与状态方程中是否存在相变无关.

英文摘要:

Ideal hydrodynamic simulations are performed to compute the evolution with collision energy of hadron spectra and elliptic flow between AGS and LHC energies. We argue that viscous effects should decrease with increasing energy, improving the applicability of ideal fluid dynamics at higher energies. We show that the increasing radial flow at higher energies pushes the elliptic flow to larger transverse momenta, leading to a peaking and subsequent decrease of the elliptic flow at fixed p_T with increasing collision energy, independent of whether or not there is a phase transition in the equation of state.

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