在sqrt(sNN)=200 GeV中心Au+Au碰撞中通过带电K介子飞秒观测的冻结动力学
Freeze-out Dynamics via Charged Kaon Femtoscopy in sqrt(sNN)=200 GeV Central Au+Au Collisions
摘要:
本文测量了sqrt(sNN)=200 GeV Au+Au碰撞中同号低横动量K介子对的三维关联函数。采用笛卡儿表面球谐分解技术提取K介子源函数。后者被发现有一个三维的高斯形状,并可以充分复制的Therminator事件发生器模拟与共振的贡献考虑在内。与π介子源函数相比,K介子源函数一般较窄,且沿对横动量方向不存在长尾。在0.55<=m_T<=1.15 GeV/c^2的区间内,K介子高斯半径随横向质量m_T的增加而单调减小。虽然在向外和侧向方向上的m_T标度充分描述了K介子半径,但在纵向方向上的最低m_T值超过了纯流体动力学模型预测的期望值。
英文摘要:
We present measurements of three-dimensional correlation functions of like-sign low transverse momentum kaon pairs from sqrt(sNN)=200 GeV Au+Au collisions. A Cartesian surface-spherical harmonic decomposition technique was used to extract the kaon source function. The latter was found to have a three-dimensional Gaussian shape and can be adequately reproduced by Therminator event generator simulations with resonance contributions taken into account. Compared to the pion one, the kaon source function is generally narrower and does not have the long tail along the pair transverse momentum direction. The kaon Gaussian radii display a monotonic decrease with increasing transverse mass m_T over the interval of 0.55<=m_T<=1.15 GeV/c^2. While the kaon radii are adequately described by the m_T-scaling in the outward and sideward directions, in the longitudinal direction the lowest m_T value exceeds the expectations from a pure hydrodynamical model prediction.
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