Speaker
Mr
Takafumi for the PHENIX Collaboration Niida
(University of Tsukuba (JP))
Description
In order to study the properties of the hot and dense matter created
by heavy ion collisions, various physics observables have been measured
in RHIC and LHC, such as spectra, collective flow, HBT, and two particle
correlations. Collective flow is a sensitive probe to access the early stage
of the matter created by the collisions. Especially higher harmonic flow,
which are primarily coming from the spatial fluctuation of the initial
participant density, can provides the strong constraints for the initial
condition and shear viscosity in hydrodynamics calculations.
HBT measurement is a powerful tool to study the space-time evolution
of particle emitting source and can provide the information on the
spatial anisotropy of the source at freeze-out. The spatial anisotropy
at freeze-out is created by the balance of the initial geometry,
the collective flow and the life time of the source. To study the interaction
between hard-scattered patrons and the hot and dense matter,
two particle correlations have been measured. Recently, it is considered
that higher harmonic flow is a possible source of "ridge" and
"mach cone" observed in two particle correlations.
Estimation and subtraction of the contribution from collective flow are
needed to extract jet components from two correlation measurements.
In this talk, we will present higher harmonic flow $v_{n}$ for charged
hadrons and azimuthal HBT measurement in Au+Au 200GeV collisions
at PHENIX. The relation between higher harmonic flow and spatial
anisotropy at freeze-out measured by HBT will be discussed. Besides,
we will also present the recent results of azimuthal hadron correlations
with the subtraction of backgrounds from higher harmonic flow.
Author
Mr
Takafumi for the PHENIX Collaboration Niida
(University of Tsukuba (JP))
