Centrality Dependence Of Two Particle Correlations In Relativistic Heavy Ion Collisions
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Centrality Dependence Of Two Particle Correlations In Relativistic Heavy Ion Collisions
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Author : Youngsoo Park
language : en
Publisher:
Release Date : 2009
Centrality Dependence Of Two Particle Correlations In Relativistic Heavy Ion Collisions written by Youngsoo Park and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Results on the centrality dependence of two-particle correlations in Au+Au collisions at ... 200GeV are presented. A particular focus is devoted to investigating any anomalous behavior in the centrality dependence of correlation functions, as previous results suggest existence of such tendencies around Npart [approx.] 50. Correlation functions are calculated for a wide kinematic region of ... from data obtained by the PHOBOS experiment at RHIC. The RHIC layout and the PHOBOS detector setup is discussed. Data acquisition method employed by the PHOBOS experiment, data processing procedures and event selection criteria are presented. The two-particle correlation function is defined and calculation procedures are described. Decomposition analysis is explained as the fit function and the constituting components are introduced. Analysis results for correlation functions and fits are presented. The results suggest that in the kinematic region covered by the analysis of this thesis, no anomalous trends in component behavior exists.
Study Of Quark Gluon Plasma By Particle Correlations In Heavy Ion Collisions
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Author : Li Yi
language : en
Publisher: Springer
Release Date : 2016-08-25
Study Of Quark Gluon Plasma By Particle Correlations In Heavy Ion Collisions written by Li Yi and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-08-25 with Science categories.
This thesis covers several important topics relevant to our understanding of quark-gluon plasma. It describes measurement of the third-order harmonic flow using two-particle correlations and isolation of flow and non-flow contributions to particle correlations in gold-gold collisions. The work also investigates long-range longitudinal correlations in small systems of deuteron-gold collisions. The former is related to the hydrodynamic transport properties of the quark-gluon plasma created in gold-gold collisions. The latter pertains to the question whether hydrodynamics is applicable to small systems, such as deuteron-gold collisions, and whether the quark-gluon plasma can be formed in those small-system collisions. The work presented in this thesis was conducted with the STAR experiment at the Relativistic Heavy Ion Collider at Brookhaven National Laboratory, where the center-of-mass energy of both collision systems was a factor of 100 larger than the rest mass of the colliding nuclei. The results contained in this thesis are highly relevant to our quest for deeper understanding of quantum chromodynamics. The results obtained challenge the interpretation of previous works from several other experiments on small systems, and provoke a fresh look at the physics of hydrodynamics and particle correlations pertinent to high energy nuclear collisions.
Particle Correlations In Ultra Relativistic Heavy Ion Collisions
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Author : Sudhir Bhardwaj
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2011-12
Particle Correlations In Ultra Relativistic Heavy Ion Collisions written by Sudhir Bhardwaj and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-12 with categories.
Quantum Chromodynamics calculations on the lattice predict that at extremely high energy densities, colliding nuclear matter would undergo a phase transition to deconfined matter of quarks and gluons. The nature of transition, the temperature and the energy density at which the transition occurs depend upon the details of calculations; these depend upon the number of quark flavors introduced in the calculation. This deconfined state of quark and gluons has been named Quark Gluon Plasma(QGP). This work purports to understand the azimuthal distribution of photons produced in Cu+Cu collisions at 200 GeV with Photon Multiplicity Detector (PMD). The PMD is part of the STAR (Solenoidal Tracker At RHIC) experiment.PMD covers a pseudorapidity range of -3.7 to -2.3 with full azimuthal coverage and measures the multiplicity and spatial distribution of photons on an event-by-event basis.The value of second order azimuthal coefficient has been determined for different centralities in different pseudorapidity windows and its pseudorapidity and centrality dependence has been obtained.
Systematic Azimuth Quadrupole And Minijet Trends From Two Particle Correlations In Heavy Ion Collisions
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Author : David Kettler
language : en
Publisher:
Release Date : 2013
Systematic Azimuth Quadrupole And Minijet Trends From Two Particle Correlations In Heavy Ion Collisions written by David Kettler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Heavy-ion collisions at the Relativistic Heavy Ion Collider (RHIC) produce a tremendous amount of data but new techniques are necessary for a comprehensive understanding of the physics behind these collisions. We present measurements from the STAR detector of both p[sub]t-integral and p[sub]t-differential azimuth two-particle correlations on azimuth (ø) and pseudorapidity (n) for unidentified hadrons in Au-Au collisions at [squareroot [super]sNN=62 and 200 GeV. The azimuth correlations can be fit to extract a quadrupole component---related to conventional v_2 measures---and a same-side peak. Both p[sub]t-integral and p[sub]t-differential results are presented as functions of Au-Au centrality.We observe simple universal energy and centrality trends for the p[sub]t-integral quadrupole component. p[sub]t-differential results can be transformed to reveal quadropole p[sub]t spectra that are nearly independent of centrality. A parametrization of the p[sub]t-differential quadrupole shows a simple p[sub]t dependence that can be factorized from the centrality and collision energy dependence above 0.75 GeV/c. Observed trends seem to be in conflict with standard hydrodynamic theories. Angular correlations contain jet-like structure wit most-probable hadron momentum ~1 GeV/c. For better comparison to RHIC data we analyze the energy scale dependence of fragmentation functions from e+-e− collisions on rapidity y. The results in a parameterization of fragmentation functions that enables extrapolation to low Q in order to describe fragment distributions at low transverse momentum p[sub]t in heavy ion collisions. We convert measured minimum-bias jet-like angular correlations to single-particle hadron yields and compare them with patron fragment yields inferred from spectrum hard components. We find that jet-like correlations in central 200 GeV Au-Au collisions correspond quantitatively to pQCD predictions, and the jet-correlated hadron yield comprises one third of the Au-Au final state in central collisions. These observations conflict with the claims of "jet quenching" at RHIC.
Two Particle Correlations In Ultra Relativistic Heavy Ion Collisions
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Author : Michael Scott Daugherity
language : en
Publisher:
Release Date : 2008
Two Particle Correlations In Ultra Relativistic Heavy Ion Collisions written by Michael Scott Daugherity and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Collisions (Nuclear physics) categories.
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What Invariant One Particle Multiplicity Distributions And Two Particle Correlations Are Telling Us About Relativistic Heavy Ion Collisions
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Author :
language : en
Publisher:
Release Date : 2006
What Invariant One Particle Multiplicity Distributions And Two Particle Correlations Are Telling Us About Relativistic Heavy Ion Collisions written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
The authors have used a nine-parameter expanding source model that includes special relativity, quantum statistics, resonance decays, and freeze-out on a realistic hypersurface in spacetime to analyze in detail invariant [pi][sup +], K[sup +], and K[sup [minus]] one-particle multiplicity distributions and [pi][sup +] and [pi][sup [minus]] two-particle correlations in nearly central collisions of Pb + Pb at p[sub lab]/A = 158 GeV/c. These studies confirm an earlier conclusion for nearly central collisions of Si + Au at p[sub lab]/A = 14.6 GeV/c that the freeze-out temperature is less than 100 meV and that both the longitudinal and transverse collective velocities -- which are anti-correlated with the temperature -- are substantial. The authors also reconciled their current results with those of previous analyses that yielded a much higher freeze-out temperature of approximately 140 meV for both Pb + Pb collisions at p[sub lab]/A = 158 GeV/c and other reactions. One type of analysis was based upon the use of a heuristic equation that neglects relativity to extrapolate slope parameters to zero particle mass. Another type of analysis utilized a thermal model in which there was an accumulation of effects from several approximations. The future should witness the arrival of much new data on invariant one-particle multiplicity distributions and two-particle correlations as functions of bombarding energy and/or size of the colliding nuclei. The proper analysis of these data in terms of a realistic model could yield accurate values for the density, temperature, collective velocity, size, and other properties of the expanding matter as it freezes out into a collection of noninteracting hadrons. A sharp discontinuity in the value of one or more of these properties could conceivably be the long-awaited signal for the formation of a quark-gluon plasma or other new physics.
Two Particle Correlations In Angular And Momentum Space In Heavy Ion Collisions At Star
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Author : Elizabeth Wingfield Oldag
language : en
Publisher:
Release Date : 2013
Two Particle Correlations In Angular And Momentum Space In Heavy Ion Collisions At Star written by Elizabeth Wingfield Oldag and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
For over a decade studies of the strong interaction in extremely dense nuclear environments have been done at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory. It is hypothesized that colliding two beams of Au nuclei at relativistic speeds creates an environment of hot dense nuclear matter where the quarks and gluons inside the nucleus, which are normally confined within the protons and neutrons, become deconfined into a soup called the quark-gluon plasma. Since direct observation of this short-lived phase is impossible, many sophisticated analysis techniques attempt to study the early interactions via the final state particles. What has emerged from analyses of the data are two, contradictory paradigms for understanding the results. On the one hand the colliding quarks and gluons are thought to strongly interact and reach thermal equilibrium. The other view is that primary parton-parton scattering leads directly to jet fragmentation with little effect from re-scattering. It is in principle possible to distinguish and perhaps falsify one or both of these models of relativistic heavy ion collisions via the analysis of two-particle correlations among all charged particles produced in [mathematical symbols] = 200 GeV Au+Au collisions at the STAR experiment at RHIC. This dissertation presents studies of two-particle correlations, whose derivation can be traced back to Pearson's correlation coefficient, in transverse momentum and angular space. In momentum space a broad peak is observed extending from 0.5-4.0 GeV/c which, as a function of nuclear overlap, remains at a fixed position while monotonically increasing in amplitude. Comparisons to theoretical models suggests this peak is from jet fragmentation. In a complementary study the momentum distribution of correlations in ([eta],[phi]) space is investigated. The momentum distribution of correlated pairs that contribute to the peak near the origin, commonly associated with jet fragmentation, is peaked around 1.5 GeV/c and does not soften with increased centrality. These measurements present important aspects of the available six dimensional correlation space and provide definitive tests for theoretical models. Preliminary findings do not appear to support the hypothesis of a strongly interacting QGP where back-to-back jets are expected to be significantly suppressed.
Incident Energy Dependence Of P Sub T Sub Correlations At Rhic
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Author :
language : en
Publisher:
Release Date : 2005
Incident Energy Dependence Of P Sub T Sub Correlations At Rhic written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
We present results for two-particle transverse momentum correlations, ?pt,i?t,j, as a function of event centrality for Au+Au collisions at √(sNN) = 20, 62, 130, and 200 GeV at the Relativistic Heavy Ion Collider. We observe correlations decreasing with centrality that are similar at all four incident energies. The correlations multiplied by the multiplicity density increase with incident energy and the centrality dependence may show evidence of processes such as thermalization, jet production, or the saturation of transverse flow. The square root of the correlations divided by the event-wise average transverse momentum per event shows little or no beam energy dependence and generally agrees with previous measurements at the Super Proton Synchrotron.
Energy And Centrality Dependence Of Mid Rapidity Charged Particle Multiplicity In Relativistic Heavy Ion Collisions
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Author : Michał Patrick Decowski
language : en
Publisher:
Release Date : 2002
Energy And Centrality Dependence Of Mid Rapidity Charged Particle Multiplicity In Relativistic Heavy Ion Collisions written by Michał Patrick Decowski and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
The properties of quantum chromodynamics (QCD), the modern theory of the strong interaction, can be investigated through the study of relativistic nucleus-nucleus collisions. Recently, the Relativistic Heavy-Ion Collider (RHIC) was completed and started taking data at ten times higher center-of-mass energies than the previous most energetic heavy-ion collisions. This thesis presents some of the first measurements at RHIC from any experiment. The PHOBOS detector is used to measure the charged particle pseudo-rapidity density at mid-rapidity (i.e., in [eta]
Two Proton Correlations In Relativistic Heavy Ion Collisions
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Author : Farshid Zarbakhsh
language : en
Publisher:
Release Date : 1982
Two Proton Correlations In Relativistic Heavy Ion Collisions written by Farshid Zarbakhsh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with categories.