243 research outputs found
Chemical and thermal freeze-out of identified hadrons at the LHC
This proceeding briefly summarizes our recent VISHNU hybrid model
investigations on the chemical and thermal freeze-out of various hadrons
species in 2.76 A TeV Pb+Pb collisions. Detailed analysis on the evolution of
particle yields and the last elastic collisions distributions during the
hadronic evolution reveals that the two multi-strange hadrons, and
, experience early chemical and thermal freeze-out when compared with
other hadron species.Comment: 4 pages, 3 figures, SQM2015 proceedin
Correlations of flow harmonics in 2.76A TeV Pb--Pb collisions
Using the event-by-event viscous hydrodynamics VISH2+1 with MC-Glauber,
MC-KLN, and AMPT initial conditions, we investigate the correlations of flow
harmonics, including the symmetric cumulants , the normalized
symmetric cumulants , and the Pearson correlation coefficients
in 2.76A TeV Pb--Pb collisions. We find is sensitive to both initial conditions and the specific shear viscosity
. A comparison with the recent ALICE data show that our hydrodynamic
calculations can qualitatively describe the data of and
for various initial conditions, which demonstrate that ,
are correlated and , are anti-correlated. Meanwhile, the
predicted symmetric cumulants , , and reveal that and , and are correlated, and
are anti-correlated in most centrality classes. We also find and , which are insensitive to , are
mainly determined by corresponding and
correlators from the initial
state. In contrast, other and
correlators are influenced by both initial conditions and , which
illustrates the non-linear mode couplings in higher flow harmonics with .Comment: 10 pages, 7 figure
Is hadronic flow produced in p--Pb collisions at the Large Hadron Collider?
Using the Ultra-relativistic Quantum Molecular Dynamics ({\tt UrQMD}) model,
we investigate the azimuthal correlations in p--Pb collisions at
TeV. It is shown that the simulated hadronic p--Pb
system can not generate the collective flow signatures, but mainly behaves as a
non-flow dominant system. However, the characteristic
mass-ordering of pions, kaons and protons is observed in {\tt UrQMD}
simulations, which is the consequence of hadronic interactions and not
necessarily associated with strong fluid-like expansions.Comment: 4 pages, 4 figures, proceedings for the 12th International Conference
on Nucleus-Nucleus Collisions (21-26 June 2015, Catania
Investigating the correlations of flow harmonics in 2.76A TeV Pb--Pb collisions
This proceeding briefly summarizes our recent investigations on the
correlations of flow harmonics in 2.76A TeV Pb--Pb collisions with viscous
hydrodynamics {\tt VISH2+1}. We calculated both the symmetric cumulants
and the normalized symmetric cumulants , and
found and , and , and are
correlated, and , and are anti-correlated. We
also found are insensitive to the QGP viscosity, which are
mainly determined by the initial conditions.Comment: SQM2016 proceeding, 4pages, 2 figure
A hybrid model approach for strange and multi-strange hadrons in 2.76 A TeV Pb+Pb collisions
Using the VISHNU hybrid model, we calculate the multiplicity, spectra, and
elliptic flow of , and in 2.76 A TeV Pb+Pb collisions.
Comparisons between our calculations and the ALICE measurements show that the
model generally describes the soft hadron data of these strange and
multi-strange hadrons at several centrality bins. Mass ordering of elliptic
flow among , K, p, , and has also been studied and
discussed. With a nice description of the particle yields, we explore chemical
and thermal freeze-out of various hadrons species at the LHC within the
framework of the VISHNU hybrid model.Comment: version 2: with several references added, published in PR
Backward magnetostatic surface spin waves in exchange coupled Co/FeNi bilayers
Propagation of backward magnetostatic surface spin waves (SWs) in exchange
coupled Co/FeNi bilayers are studied by using Brillouin light scattering (BLS)
technique. Two types of SWs modes were identified in our BLS measurements. They
are magnetostatic surface waves (MSSWs) mode and perpendicular standing spin
waves (PSSWs) mode. The dispersion relations of MSSWs obtained from the Stokes
and Anti-Stokes measurements display respectively positive and negative group
velocities. The Anti-Stokes branch with positive phase velocities and negative
group velocities, known as backward magnetostatic surface mode originates from
the magnetostatic interaction of the bilayer. The experimental data are in good
agreement with the theoretical calculations. Our results are useful for
understanding the SWs propagation and miniaturizing SWs storage devices
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