Scaling properties and charge dependence of particle ratio fluctuations at RHIC

Open Physics ◽  
2012 ◽  
Vol 10 (6) ◽  
Author(s):  
Hui Wang
Keyword(s):  
Baryon Number ◽  
Scaling Properties ◽  
Qcd Phase Transition ◽  
Star Data ◽  
Qcd Phase Diagram ◽  
Charge Dependence ◽  
Model Predictions ◽  
200 Gev ◽  
Particle Ratio ◽  
Particle Ratio Fluctuations

AbstractIt has been suggested that the existence of a QCD phase transition would cause an increase and divergence of fluctuations. Thus event-by-event particle ratio fluctuations could be used to study strangeness and baryon number fluctuations near the critical point in the QCD phase diagram. In this paper, we present dynamical K/π, p/π, and K/p ratio fluctuations from Au+Au collisions at $\sqrt {s_{NN} } $ = 7.7 to 200 GeV. Charge dependent results as well as multiplicity scaling properties of these fluctuation results are discussed. The STAR data are compared to different theoretical model predictions and previous experimental results.

scholarly journals Restoring canonical partition functions from imaginary chemical potential

2018 ◽  
Vol 175 ◽  
pp. 07027 ◽  
Author(s):  
V.G. Bornyakov ◽  
D. Boyda ◽  
V. Goy ◽  
A. Molochkov ◽  
A. Nakamura ◽  
...  
Keyword(s):  
Chemical Potential ◽  
Baryon Number ◽  
Partition Functions ◽  
Transition Line ◽  
Qcd Phase Transition ◽  
Qcd Phase Diagram ◽  
Sign Problem ◽  
Canonical Approach ◽  
Grand Canonical ◽  
Fugacity Expansion

Using GPGPU techniques and multi-precision calculation we developed the code to study QCD phase transition line in the canonical approach. The canonical approach is a powerful tool to investigate sign problem in Lattice QCD. The central part of the canonical approach is the fugacity expansion of the grand canonical partition functions. Canonical partition functions Zn(T) are coefficients of this expansion. Using various methods we study properties of Zn(T). At the last step we perform cubic spline for temperature dependence of Zn(T) at fixed n and compute baryon number susceptibility χB/T2 as function of temperature. After that we compute numerically ∂χ/∂T and restore crossover line in QCD phase diagram. We use improved Wilson fermions and Iwasaki gauge action on the 163 × 4 lattice with mπ/mρ = 0.8 as a sandbox to check the canonical approach. In this framework we obtain coefficient in parametrization of crossover line Tc(µ2B) = Tc(C−ĸµ2B/T2c) with ĸ = −0.0453 ± 0.0099.

The microsecond old universe — Relics of QCD phase transition

2014 ◽  
Vol 29 (23) ◽  
pp. 1430024 ◽  
Author(s):  
Bikash Sinha
Keyword(s):  
Phase Transition ◽  
Cold Dark Matter ◽  
Baryon Number ◽  
Qcd Phase Transition ◽  
First Order ◽  
Qcd Phase Diagram ◽  
Hadron Phase ◽  
History Of ◽  
Entire History ◽  
The Universe

It is entirely plausible under reasonable conditions, that a first-order QCD phase transition occurred from quarks to hadrons when the universe was about a microsecond old. Relics, if there be any, after the quark–hadron phase transition are the most deciding signatures of the phase transition. It is shown in this paper that quark nuggets, the possible relics of first-order QCD phase transitions with baryon number larger than 1043 will survive the entire history of the universe up to now and can be considered as a candidate for the cold dark matter. The spin down core of the neutron star on the high density low temperature end of the QCD phase diagram initiates transition from hadrons to quarks. As the star spins down, the size of the core goes on increasing. Recently discovered massive Pulsar PSRJ 1614-2230 with a mass of 1.97 ± 0.04M⊙ most likely has a strongly interacting core. What possible observables can there be from these neutron stars?

Mapping the QCD phase diagram with susceptibilities of conserved charges within Nambu–Jona-Lasinio model

2017 ◽  
Vol 32 (11) ◽  
pp. 1750061 ◽  
Author(s):  
Wenkai Fan ◽  
Xiaofeng Luo ◽  
Hong-Shi Zong
Keyword(s):  
Strange Quark ◽  
Collision Energy ◽  
Chemical Potential ◽  
Baryon Number ◽  
Baryon Chemical Potential ◽  
Experiment Data ◽  
High Collision Energy ◽  
Qcd Phase Diagram ◽  
Strange Quark Mass ◽  
Different Temperatures

We evaluate the second to fourth-order baryon, charge and strangeness susceptibilities near a chiral critical point using the Nambu–Jona-Lasinio model under different temperatures and baryon chemical potential. Baryon number susceptibilities are found to be of the greatest magnitude, offering the strongest signal. Whereas the strangeness susceptibilities have the smallest divergence dominating area, owing to the large strange quark mass. We also make an attempt to compare our results with experiment data. The trend at high collision energy is found to be consistent between theory and experiment. The model calculation predicts more complex behavior at low collision energies, near the postulated critical end point.

scholarly journals System-size dependence of particle-ratio fluctuations in Pb + Pb collisions at 158AGeV

2013 ◽  
Vol 87 (2) ◽  
Author(s):  
T. Anticic ◽  
B. Baatar ◽  
D. Barna ◽  
J. Bartke ◽  
H. Beck ◽  
...  
Keyword(s):  
Size Dependence ◽  
System Size ◽  
Particle Ratio ◽  
Particle Ratio Fluctuations

scholarly journals Scaling Properties of Azimuthal Anisotropy inAu+AuandCu+CuCollisions atsNN=200  GeV

2007 ◽  
Vol 98 (16) ◽  
Author(s):  
A. Adare ◽  
S. Afanasiev ◽  
C. Aidala ◽  
N. N. Ajitanand ◽  
Y. Akiba ◽  
...  
Keyword(s):  
Azimuthal Anisotropy ◽  
Scaling Properties ◽  
200 Gev

Di-lepton production in heavy-ion collisions and the QCD phase diagram

Open Physics ◽  
2012 ◽  
Vol 10 (6) ◽  
Author(s):  
Yifei Zhang ◽  
Haojie Xu ◽  
Wangmei Zha ◽  
Qun Wang
Keyword(s):  
Phase Diagram ◽  
Mass Spectra ◽  
Heavy Ion ◽  
Mass Region ◽  
Lepton Production ◽  
Qcd Phase Diagram ◽  
Ion Collisions ◽  
200 Gev ◽  
Star Experiment ◽  
Low Mass

AbstractWe reproduce di-electron spectra in the region of 0 < m e+e < 4 GeV in both minimum bias and central Au+Au collisions at $\sqrt {s_{NN} } $ = 200 GeV measured by the STAR experiment. A cocktail simulation, incorporating STAR acceptance and detector responses, is able to describe the “enhancement” of the low mass region by including an in-medium modification of vector mesons and a thermal di-lepton calculation. We also predict the di-lepton mass spectra in RHIC lower energies via an extrapolation method. The evolution of Di-lepton mass spectra, effective temperature, and possible medium modifications versus colliding energies are studied to explore the QCD phase diagram.

scholarly journals Fourier coefficients of the net baryon number density and their scaling properties near a phase transition

2019 ◽  
Vol 793 ◽  
pp. 19-25 ◽  
Author(s):  
Gábor András Almási ◽  
Bengt Friman ◽  
Kenji Morita ◽  
Krzysztof Redlich
Keyword(s):  
Phase Transition ◽  
Fourier Coefficients ◽  
Baryon Number ◽  
Number Density ◽  
Scaling Properties

scholarly journals Phase-space dependence of particle-ratio fluctuations in Pb + Pb collisions from 20Ato 158A GeV beam energy

2014 ◽  
Vol 89 (5) ◽  
Author(s):  
T. Anticic ◽  
B. Baatar ◽  
J. Bartke ◽  
H. Beck ◽  
L. Betev ◽  
...  
Keyword(s):  
Phase Space ◽  
Beam Energy ◽  
Particle Ratio ◽  
Space Dependence ◽  
Particle Ratio Fluctuations
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