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Freeze-out dynamics via charged kaon femtoscopy in √s[subscript NN] = 200 GeV central Au + Au collisions

Author(s)
Betancourt, Michael Joseph; Corliss, Ross; Hays-Wehle, James Prewitt; Leight, William Axel; van Nieuwenhuizen, Gerrit Jan; Balewski, Jan T.; Stevens, J. R.; Walker, M.; ... Show more Show less
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Abstract
We present measurements of three-dimensional correlation functions of like-sign, low-transverse-momentum kaon pairs from √s[subscript 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[subscript T] over the interval of 0.55 ≤ m[subscript T] ≤ 1.15 GeV/c[superscript 2]. While the kaon radii are adequately described by the m[subscript T]-scaling in the outward and sideward directions, in the longitudinal direction the lowest m[subscript T] value exceeds the expectations from a pure hydrodynamical model prediction.
Date issued
2013-09
URI
http://hdl.handle.net/1721.1/84651
Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review C
Publisher
American Physical Society
Citation
Adamczyk, L., J. K. Adkins, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, I. Alekseev, J. Alford, et al. “Freeze-out dynamics via charged kaon femtoscopy in √s[subscript NN] = 200 GeV central Au + Au collisions.” Physical Review C 88, no. 3 (September 2013). © 2013 American Physical Society
Version: Final published version
ISSN
0556-2813
1089-490X

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