What Invariant One Particle Multiplicity Distributions And Two Particle Correlations Are Telling Us About Relativistic Heavy Ion Collisions
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Advances In Nuclear Dynamics 4
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Author : Wolfgang Bauer
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-11-11
Advances In Nuclear Dynamics 4 written by Wolfgang Bauer and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-11 with Science categories.
Proceedings of the 14th Winter Workshop held in Snowbird, Utah, January 31-February 7, 1998
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 : 1998
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 1998 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?, K+, and K− one-particle multiplicity distributions and?+ and?− 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.
High Energy Physics Index
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Author :
language : en
Publisher:
Release Date : 1990
High Energy Physics Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Nuclear physics categories.
Energy Research Abstracts
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Author :
language : en
Publisher:
Release Date : 1995
Energy Research Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Power resources categories.
Inis Atomindex
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Author :
language : en
Publisher:
Release Date : 1985
Inis Atomindex written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Nuclear energy categories.
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.
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.
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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Analysis Of Multiparticle Bose Einstein Correlations In Ultra Relativistic Heavy Ion Collisions
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Author :
language : en
Publisher:
Release Date : 1990
Analysis Of Multiparticle Bose Einstein Correlations In Ultra 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 1990 with categories.
We introduce the coalescence variables, a set of three boost-invariant kinematic quantities which may be used in analyzing n-particle correlations. These variables characterize the invariant mass of an n-particle and in three directions and separate the timelike and spacelike characteristics of the source. The analytic Kolehmanien-Gyulassy model is generalized to give two, three, and four-particle correlation functions, with coherence and Coulomb corrections applied to the basic formalism. We demonstrate the relation of the coalescence variables to be radius and duration of the source, and find that for sufficiently large transverse radii, Coulomb effects can suppress the structure of the Hanbury-Brown-Twiss correlations so that no significant information on source size can be obtained. 11 refs., 10 figs.
Studies Of Relativistic Heavy Ion Collisions At The Ags E814
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Author :
language : en
Publisher:
Release Date : 1993
Studies Of Relativistic Heavy Ion Collisions At The Ags E814 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.
Efforts have continued in the area of peripheral and central collisions of relativistic heavy ions. In the area of peripheral collisions, the analysis of the 1n and 2p decay channels has been completed. In the area of central collisions, the first measurement of the E[sub T] distributions in Au + Au collisions, through the use of the participant calorimeter, was completed, and the results were compared with those obtained in collisions with Si projectiles. In addition, a thorough study of two-particle correlation functions was carried out by use of the data from the silicon pad multiplicity detector. Differential cross sections for 14.6-GeV/c [sup 28]Si on Al, Cu, and Pb, and 11.4-GeV/c [sup 197]Au on Al, Cu, Au, and Pb are given. 32 figs., 4 tabs., 24 refs.