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Joint Institute for Nuclear Research, Dubna, Moscow Region, Russia.
Phys Rev Lett. 2008 Jun 13;100(23):232301. doi: 10.1103/PhysRevLett.100.232301.
A three-dimensional correlation function obtained from midrapidity, low p(T), pion pairs in central Au+Au collisions at sqrt[s(NN)]=200 GeV is studied. The extracted model-independent source function indicates a long range tail in the directions of the pion pair transverse momentum (out) and the beam (long). A proper breakup time tau(0) ~ 9 fm/c and a mean proper emission duration Delta tau ~ 2 fm/c, leading to sizable emission time differences ({|Delta t(LCM)|} approximately 12 fm/c), are required to allow models to be successfully matched to these tails. The model comparisons also suggest an outside-in "burning" of the emission source reminiscent of many hydrodynamical models.
研究了在(\sqrt{s(NN)} = 200)GeV的中心金离子+金离子碰撞中，从中快度、低横动量的π介子对得到的三维关联函数。提取的与模型无关的源函数表明，在π介子对横向动量方向（向外）和束流方向（纵向）存在长程尾巴。为了使模型成功匹配这些尾巴，需要一个合适的破裂时间(\tau(0) \sim 9)fm/c和一个平均本征发射持续时间(\Delta \tau \sim 2)fm/c，这会导致相当大的发射时间差（({| \Delta t(LCM)| } \approx 12)fm/c）。模型比较还表明发射源存在从外到内的“燃烧”，这让人想起许多流体动力学模型。
