Freeze-out dynamics via charged kaon femtoscopy in $\sqrt{{s}_{NN}}$ = 200 GeV central Au + Au collisions

The STAR collaboration
Phys.Rev.C 88 (2013) 034906, 2013.

Abstract (data abstract)
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.

  • Figure 1


    Independent correlation moments Rl(q) for orders l = 0,2,4 for midrapidity, low transverse momentum kaon pairs from the 20% most...

  • Figure 2


    Kaon correlation function profiles for midrapidity, low transverse momentum kaon pairs from the 20% most central Au+Au collisions at sqrt(sNN)=200...

  • Figure 3


    Kaon source function profiles extracted from the data

  • Figure 4


    Transverse mass dependence of Gaussian radii Rout, Rside and Rlong and of experimental values of the Gaussian fit parameter lambda...

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