Freeze-out dynamics via charged kaon femtoscopy in √ sNN = 200 GeV central Au + Au collisions

Authors

L. Adamczyk, AGH University of Science and Technology
E. Elnimr, Wayne State UniversityFollow
S. LaPointe, Wayne State UniversityFollow
C. Pruneau, Wayne State UniversityFollow
J. Putschke, Wayne State UniversityFollow
M. Sharma, Wayne State UniversityFollow
L. H. Tarini, Wayne State UniversityFollow
S. A. Voloshin, Wayne State UniversityFollow
STAR Collaboration

Document Type

Article

Abstract

We present measurements of three-dimensional correlation functions of like-sign, low-transverse-momentum kaon pairs from √s_NN=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/c². 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.

Disciplines

Elementary Particles and Fields and String Theory | Quantum Physics

Comments

For full list of authors, please see supplemental materials.

Recommended Citation

L. Adamczyk et al. (STAR Collaboration) Phy. Rev. C 88, 034906 (2013).