84 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
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
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
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
Spatiotemporal expression of histone acetyltransferases, p300 and CBP, in developing embryonic hearts
Histone acetyltransferases (HATs), p300 and cAMP response element binding protein (CREB)-binding protein (CBP) are two structurally related transcriptional co-activators that activate expression of many eukaryotic genes involved in cellular growth and signaling, muscle differentiation and embryogenesis. However, whether these proteins play important and different roles in mouse cardiogenesis is not clear. Here, we investigate the protein distributions and mRNA expression of the two HATs in embryonic and adult mouse heart during normal heart development by using immunohistochemical and RT-PCR techniques. The data from immunohistochemical experiments revealed that p300 was extensively present in nearly every region of the hearts from embryonic stages to the adulthood. However, no CBP expression was detected in embryonic hearts at day E7.5. CBP expression appeared at the later stages, and the distribution of CBP was less than that of p300. In the developmental hearts after E10.5, both for p300 and CBP, the mRNA expression levels reached a peak on day E10.5, and then were gradually decreased afterwards. These results reveal that both p300 and CBP are related to embryonic heart development. The dynamic expression patterns of these two enzymes during mouse heart development indicate that they may play an important role on heart development. However, there is a difference in spatiotemporal expression patterns between these two enzymes during heart development. The expression of p300 is earlier and more predominate, suggesting that p300 may play a more important role in embryonic heart development especially during cardiac precursor cell induction and interventricular septum formation
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