Speaker
HIROMI HINOHARA
(Sophia University)
Description
Femtoscopic analyses have a long history towards comprehensive
understanding of the space-time structure of dynamically evolving matter
created in high-energy nuclear collisions. Among them, the source
imaging technique enables us to extract the source function, namely
distribution of the relative distance between two emission points for
observed particles, directly from two particle correlation functions.
Since the source function looks no longer a Gaussian in general, it
contains richer information about the space-time distribution of
emission source than HBT radii and is an ideal quantity to compare
experimental data with theoretical results. In this study, we discuss
one- and three-dimensional source functions for pions and kaons from a
hydro + hadronic cascade hybrid model simulations [1]. Our model
consists of event-by-event Glauber-type initial conditions,
(3+1)-dimensional ideal hydrodynamics for the quark gluon plasma and a
hadronic cascade for the hadron resonance gas. We first confirm the
$p_{T}$ spectra for pions and kaons are reproduced well. We next
calculate one-dimensional source function of pions and kaons in Au + Au
collisions at the top RHIC energy and find that hadronic rescatterings
play a significant role to describe non-Gaussian tail which was observed
by the PHENIX Collaboration. We also analyze three-dimensional source
functions at the RHIC energy, where a special attention is paid to
obtain the source function by decomposing them into coefficients of
Cartesian spherical harmonics as the PHENIX Collaboration employed the
same technique. Finally we also predict the source functions of pions
and kaons from hybrid model simulations of Pb+Pb collisions at the LHC
energy and compare them with the ones at the RHIC energy.
[1] T.Hirano et al., Prog. Part. Nucl. Phys. 70, 108 (2013).
Primary authors
HIROMI HINOHARA
(Sophia University)
Tetsufumi Hirano
(Sophia Univ)
Co-author
Koichi Murase
(The University of Tokyo)
