scholarly journals Experimental Results on Charge Fluctuations in Heavy-Ion Collisions

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
D. K. Mishra ◽  
P. Garg ◽  
P. K. Netrakanti ◽  
L. M. Pant ◽  
A. K. Mohanty
Keyword(s):  
Electric Charge ◽  
Heavy Ion Collisions ◽  
Collision Energy ◽  
Heavy Ion ◽  
Experimental Results ◽  
Higher Moments ◽  
Net Charge ◽  
Charge Fluctuations ◽  
Ion Collisions ◽  
Particle Ratios

We present a subset of experimental results on charge fluctuation from the heavy-ion collisions to search for phase transition and location of critical point in the QCD phase diagram. Measurements from the heavy-ion experiments at the SPS and RHIC energies observe that total charge fluctuations increase from central to peripheral collisions. The net-charge fluctuations in terms of dynamical fluctuation measure ν(+-,dyn) are studied as a function of collision energy (sNN) and centrality of the collisions. The product of ν(+-,dyn) and 〈Nch〉 shows a monotonic decrease with collision energies, which indicates that at LHC energy the fluctuations have their origin in the QGP phase. The fluctuations in terms of higher moments of net-proton, net-electric charge, and net-kaon have been measured for various sNN. Deviations are observed in both Sσ and κσ2 for net-proton multiplicity distributions from the Skellam and hadron resonance gas model for sNN<39 GeV. Higher moment results of the net-electric charge and net-kaon do not observe any significant nonmonotonic behavior as a function of collision energy. We also discuss the extraction of the freeze-out parameters using particle ratios and experimentally measured higher moments of net-charge fluctuations. The extracted freeze-out parameters from experimentally measured moments and lattice calculations are found to be in agreement with the results obtained from the fit of particle ratios to the thermal model calculations.

scholarly journals Poisson baseline of net-charge fluctuations in relativistic heavy ion collisions

2018 ◽  
Vol 42 (7) ◽  
pp. 074104 ◽  
Author(s):  
Xue Pan ◽  
Yu-Fu Lin ◽  
Li-Zhu Chen ◽  
Ming-Mei Xu ◽  
Yuan-Fang Wu
Keyword(s):  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Net Charge ◽  
Charge Fluctuations ◽  
Ion Collisions

scholarly journals Finite-size behaviour of a critical related observable

Open Physics ◽  
2012 ◽  
Vol 10 (6) ◽  
Author(s):  
Wu Yuanfang ◽  
Chen Lizhu ◽  
Pan Xue ◽  
Shao Ming ◽  
Xiaosong Chen
Keyword(s):  
Fixed Point ◽  
Heavy Ion Collisions ◽  
Finite Size ◽  
System Size ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Charge Fluctuations ◽  
Qcd Critical Point ◽  
Ion Collisions ◽  
Straight Line

AbstractAccounting for the influence of system size in relativistic heavy ion collisions, the finite-size form of a critical related observable is suggested. The fixed-point and straight line methods are proposed in exploring the QCD critical point and phase boundary in relativistic heavy ion collisions. As an application, the finitesize behaviour of the ratios of higher net-proton cumulants, dynamical electric charge fluctuations, and transverse momentum correlations in Au + Au collisions at RHIC are examined.

scholarly journals Recent results from PHENIX at RHIC

2019 ◽  
Vol 204 ◽  
pp. 01017
Author(s):  
Victor Riabov
Keyword(s):  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Hadron Production ◽  
Large Datasets ◽  
Experimental Results ◽  
Relativistic Heavy Ion Collider ◽  
Direct Photons ◽  
Angular Correlations ◽  
Phenix Experiment ◽  
Ion Collisions

The PHENIX experiment at the relativistic heavy ion collider (RHIC) finished data taking in 2016. However, large datasets collected in different collision systems (p+p, p+A and A+A) at different energies (√sNN = 19-500 GeV) during the last years of the detector operation are actively analysed by the collaboration and bring a wealth of new experimental results. This paper reviews the most recent PHENIX results on the light flavour hadron production, yields and angular correlations of the direct photons in heavy-ion collisions as well as on the search for the onset of collectivity in high multiplicity p+p and p+A collisions.

scholarly journals Determination of freeze-out conditions from lattice QCD calculations

Open Physics ◽  
2012 ◽  
Vol 10 (6) ◽  
Author(s):  
Frithjof Karsch
Keyword(s):  
Lattice Qcd ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Experimental Results ◽  
Ion Collisions ◽  
Theoretical Predictions ◽  
Freeze Out

AbstractFreeze-out conditions in Heavy Ion Collisions are generally determined by comparing experimental results for ratios of particle yields with theoretical predictions based on applications of the Hadron Resonance Gas model. We discuss here how this model dependent determination of freeze-out parameters may eventually be replaced by theoretical predictions based on equilibrium QCD thermodynamics.

scholarly journals NEW HUNT FOR AN INTERMEDIATE MASS HIGGS-BOSON IN PERIPHERAL ULTRARELATIVISTIC HEAVY-ION COLLISIONS

1995 ◽  
Vol 10 (32) ◽  
pp. 2471-2477 ◽  
Author(s):  
MARIO VIDOVIĆ ◽  
MARTIN GREINER ◽  
GERHARD SOFF
Keyword(s):  
Higgs Boson ◽  
Heavy Ion Collisions ◽  
Collision Energy ◽  
Gluon Fusion ◽  
Heavy Ion ◽  
Intermediate Mass ◽  
Two Photon ◽  
Ion Collisions ◽  
Text Production ◽  
Ultrarelativistic Heavy Ion Collisions

We reopen the discussion on the two-photon production of the intermediate mass Higgs-boson in peripheral ultrarelativistic heavy-ion collisions at LHC. Due to larger expected luminosity, larger collision energy and higher photon energies, the Higgs production rate is enlarged by more than a factor of 10 in Ca+Ca collisions compared to Pb+Pb collisions. Besides the background of direct [Formula: see text]-production via two-photon fusion, we also discuss photon-gluon fusion into [Formula: see text].

scholarly journals HANBURY-BROWN–TWISS INTERFEROMETRY WITH IDENTICAL BOSONS IN RELATIVISTIC HEAVY ION COLLISIONS: COMPARISONS WITH HADRONIC SCATTERING MODELS

2006 ◽  
Vol 15 (01) ◽  
pp. 197-236 ◽  
Author(s):  
THOMAS J. HUMANIC
Keyword(s):  
Heavy Ion Collisions ◽  
Center Of Mass ◽  
Heavy Ion ◽  
Physical Significance ◽  
Experimental Results ◽  
Relativistic Heavy Ion Collisions ◽  
Identical Boson ◽  
Ion Collisions

Identical boson Hanbury-Brown–Twiss interferometry as applied to relativistic heavy-ion collisions is reviewed. Emphasis is placed on the use of hadronic scattering models to interpret the physical significance of experimental results. Interferometric studies with center-of-mass energies from <1 GeV/nucleon up to 5500 GeV/nucleon are considered.

scholarly journals Heavy flavour production at RHIC and LHC

2018 ◽  
Vol 171 ◽  
pp. 04001 ◽  
Author(s):  
Gian Michele Innocenti
Keyword(s):  
Energy Loss ◽  
Quark Matter ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Experimental Results ◽  
Relativistic Heavy Ion Collisions ◽  
Dense Medium ◽  
Medium Energy ◽  
Ion Collisions ◽  
Flavour Physics

In this proceedings, I present selected experimental results on heavy-flavour production at RHIC and at the LHC, which were presented at the Strangeness in Quark Matter 2017 conference. I will present a brief introduction to the heavy-flavour physics in heavy ion collisions and I will focus on recents measurements of in-medium energy loss and and collective properties of heavy-flavour particles, which provided important information on the mechanisms of heavy flavour interaction with the hot and dense medium created in ultra-relativistic heavy-ion collisions.

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