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Author : Brooke Haag
Publisher :
ISBN 13 :
Total Pages : 330 pages
Book Rating : 4.:/5 (83 download)
Download or read book Characterization of Au+Au Collisions at [center of Mass Energy] written by Brooke Haag and published by . This book was released on 2009 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Evan Warren Sangaline
Publisher :
ISBN 13 : 9781321363913
Total Pages : pages
Book Rating : 4.3/5 (639 download)
Download or read book Ups and Downs with a Bit of Strange written by Evan Warren Sangaline and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental results from the Relativistic Heavy Ion Collider (RHIC) Beam Energy Scan (BES) on identified particle spectra of [pi]+(−), K+(−), and p-(p) at mid-rapidity are presented. Au+Au collisions at center-of-mass energies of [squareroot]sNN=7.7, 11.5, 19.6, 27.0, 39.0, and 62.4 GeV are analyzed using data recorded by the Solenoidal Tracker at RHIC (STAR) detector. The resulting spectra are used to construct measurements of the nuclear modification factor R(CP), Bjorken energy density, and central event baryon enhancement as a function of collision energy. These measurements address the onset of deconfinement and help to bridge the gap between Super Proton Synchrotron (SPS) energies and top RHIC energy.
Author : Michael George Anderson
Publisher :
ISBN 13 :
Total Pages : 312 pages
Book Rating : 4.:/5 (74 download)
Download or read book Directed and Elliptic Flow in Au + Au Collisions at a Center of Mass Energy of 19.6 GeV Per Nucleon-nucleon Pair written by Michael George Anderson and published by . This book was released on 2006 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Aya Ishihara
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (672 download)
Download or read book Large-scale Two-particle Correlation Sructures in Au-Au Collisions at Center of Mass Energy written by Aya Ishihara and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Selemon Bekele
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (585 download)
Download or read book Neutral Kaon Correlations in Au-au Collisions at Center of Mass Energy of 200 GeV Per Nucleon Pair written by Selemon Bekele and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: A few microseconds after the Big Bang, the universe is believed to have existed in the form of a plasma composed of strongly interacting particles known as quarks and gluons. Although the quarks and gluons behave as asymptotically free particles in a Quark Gluon Plasma (QGP), free quarks and gluons have never been discovered in the laboratory. Experiments at the Relativistic Heavy Ion Collider (RHIC) aim to create conditions similar to the early universe by colliding heavy ions at the highest energies possible in the hope of observing a phase transition from a QGP into hadronic degrees of freedom. The response of the space time structure of the hot reaction zone created in a heavy ion collision to a phase transition is one of the many observables being studied at RHIC. Making use of the techniques of two particle intensity interferometry, also known as the HBT effect, the RHIC experiments are studying the space-time structure and dynamical properties of the region from which particles are emitted. A large spatial size and long duration of particle emission are the predicted signals for a phase transition from a QGP to a hadronic phase. In this thesis we present results on the first measurement of one dimensional K0[subscript s] K0[subscript s] interferometry by the STAR experiment at RHIC in central (small impact parameter) Au-Au collisions at center of mass energy of 200 GeV per nucleon pair. The lambda parameter, which is a measure of the sources chaoticity, is found to be consistent with unity confirming the fact that the source is mostly chaotic as measured by STAR using three particle correlations. Without taking into account the effect of the strong interaction, the invariant radius R inv is found to be large for the mean transverse mass M [subscript t] of the pair, which is about 980 MeV/c, compared to expectations from charged pion correlations at the same M [subscript t]. Including the effect of the strong interactions makes the radius parameter for the K0[subscript s] K0[subscript s] system fall within the charged pion M [subscript t] systematics. Our result serves as a valuable cross-check of charged pion measurements which are mainly affected by contributions from resonance decays and final state interactions. This is also an important first step towards a full three dimensional analysis of neutral kaon correlations as high statistics data from RHIC will be available in the near future.
Author :
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ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (682 download)
Download or read book Collective Flow in Au + Au Collisions written by and published by . This book was released on 1994 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on a preliminary sample of Au + Au collisions in the EOS time projection chamber at the Bevalac, we study sideward flow as a function of bombarding energy between 0.25A GeV and 1.2A GeV. We focus on the increase in in-plane transverse momentum per nucleon with fragment mass. We also find event shapes to be close to spherical in the most central collisions, independent of bombarding energy and fragment mass up to 4He.
Author : Carla Manuel Vale
Publisher :
ISBN 13 :
Total Pages : 154 pages
Book Rating : 4.:/5 (565 download)
Download or read book Elliptic Flow in Au+Au Collisions at 200 GeV Per Nucleon Pair written by Carla Manuel Vale and published by . This book was released on 2004 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Relativistic Heavy Ion Collider (RHIC) has provided its experiments with the most energetic nucleus-nucleus collisions ever achieved in a laboratory. These collisions allow for the study of the properties of nuclear matter at very high temperature and energy density, and may uncover new forms of matter created under such conditions. This thesis presents measurements of the elliptic flow amplitude, v2, in Au+Au collisions at RHIC's top center of mass energy of 200 GeV per nucleon pair. Elliptic flow is interesting as a probe of the dynamical evolution of the system formed in the collision. The elliptic flow dependences on transverse momentum, centrality, and pseudorapidity were measured using data collected by the PHOBOS detector during the 2001 RHIC run. The reaction plane of the collision was determined using the multiplicity detector, and the azimuthal angles of tracks reconstructed in the spectrometer were then correlated with the found reaction plane. The v2 values grow almost linearly with transverse momentum, up to P[sub]T of approximately 1.5 GeV, saturating at about 14%. As a function of centrality, v2 is minimum for central events, as expected from geometry, and increases up to near 7% (for 0
Author : Martin David Partlan
Publisher :
ISBN 13 :
Total Pages : 288 pages
Book Rating : 4.:/5 (54 download)
Download or read book Collective Flow in Au+Au Collisions with Incident Energies from 0.25 to 1.15 A GeV written by Martin David Partlan and published by . This book was released on 1994 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Michael David Heffner
Publisher :
ISBN 13 :
Total Pages : 298 pages
Book Rating : 4.:/5 (6 download)
Download or read book Hadron Spectra in Au+Au Collisions at the BNL AGS written by Michael David Heffner and published by . This book was released on 2000 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book J/psi Production in Au-Au Collisions at Square Root (s/sub NN) written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents the first J/psi production analysis of Au+Au reactions at forward rapidity at [square root]sNN = 200 GeV. In the second year of RHIC running, design energy was achieved in the collisions of both Au+Au ions and proton+proton reactions. The production of the J/psi is measured by the PHENIX experiment in Au+Au collisions as well as in proton-proton collisions. The scientific goal is to investigate the nature of hot, dense nuclear matter capitalizing on the unique properties of the J/psi as a probe of this matter. Recent experimental results by the NA50 collaboration at CERN strongly deviate from the conventional picture that successfully describes data at lower energies. The importance of such a measurement is demonstrated by the wide spectrum of theoretical explanations concerning the existing data. The merits of these models will be explored in a systematic and comprehensive study of the J/psi and open charm in collisions of a variety of species and energy. A survey of the theoretical models is presented and the relevant open charm and J/psi PHENIX measurements are compared.
Author :
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ISBN 13 :
Total Pages : 15 pages
Book Rating : 4.:/5 (727 download)
Download or read book Measurements of Transverse Energy Distributions in Au+Au Collisions at (square Root)s{sub NN} written by and published by . This book was released on 2004 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transverse energy (E{sub T}) distributions have been measured for Au+Au collisions at (square root)s{sub NN} = 200 GeV by the STAR collaboration at RHIC. E{sub T} is constructed from its hadronic and electromagnetic components, which have been measured separately. E{sub T} production for the most central collisions is well described by several theoretical models whose common feature is large energy density achieved early in the fireball evolution. The magnitude and centrality dependence of E{sub T} per charged particle agrees well with measurements at lower collision energy, indicating that the growth in E{sub T} for larger collision energy results from the growth in particle production. The electromagnetic fraction of the total E{sub T} is consistent with a final state dominated by mesons and independent of centrality.
Author : Marguerite Belt Tonjes
Publisher :
ISBN 13 :
Total Pages : 360 pages
Book Rating : 4.3/5 (129 download)
Download or read book Using the Balance Function to Search for Late Hadronization in Au + Au Collisions at a Center of Mass Energy of 130 GeV Per Nucleon Pair written by Marguerite Belt Tonjes and published by . This book was released on 2002 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Author : Wensheng Deng
Publisher :
ISBN 13 :
Total Pages : 162 pages
Book Rating : 4.:/5 (512 download)
Download or read book Charged Kaon Production in Au+Au Collisions at [center-of-mass Energy Per Nucleon Pair] written by Wensheng Deng and published by . This book was released on 2002 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
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ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (925 download)
Download or read book Analysis of D/p Ratio in Au+Au Collisions from the E866 Experiment at the AGS. written by and published by . This book was released on 1996 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: High energy nucleus-nucleus collisions are a great interest as a means of creating a new state of matter. The transition of nuclear matter to quark matter is expected to result in a strongly interacting region that lives for a long time and expands to a large volume. In order to understand the properties of the collision region, it is important to gather information experimentally on the lifetime and thermodynamic attributes such as temperature, volume, density, and entropy of the collision region. Deuteron production by phase space coalescence is particularly interesting because it can be used as a probe in studying the space-time structure of the heavy ion collisions. In the hot and dense participant region, a proton and a neutron coalesce when their relative momentum is small. The deuteron density in momentum space is proportional to the proton density squared in momentum space at equal momenta per nucleon, assuming proton and neutron density to be identical. The motivation here is to study the properties of the coalesced deuterons formed in the participant region of Au-Au collisions at 11.6 GeV/c. The d/p ratio as a function of centrality is studied in hopes of gaining information about any change in the size of the participant zone which could lead to the effort of searching for the Quark-Gluon-Plasma at the AGS. The results shown here is very preliminary and the work is in progress.
Download or read book Energy Dependence of K?, P? and Kp Fluctuations in Au+Au Collisions from {u221A}sNN written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for the quantum chromodynamics (QCD) critical point was performed by the STAR experiment at the Relativistic Heavy Ion Collider, using dynamical fluctuations of unlike particle pairs. Heavy ion collisions were studied over a large range of collision energies with homogeneous acceptance and excellent particle identification, covering a significant range in the QCD phase diagram where a critical point may be located. Dynamical K?, p?, and Kp fluctuations as measured by the STAR experiment in central 0–5% Au+Au collisions from center-of-mass collision energies √sNN=7.7 to 200 GeV are presented. The observable ?dyn was used to quantify the magnitude of the dynamical fluctuations in event-by-event measurements of the K?, p?, and Kp pairs. The energy dependences of these fluctuations from central 0–5% Au+Au collisions all demonstrate a smooth evolution with collision energy.
Author : Kristján Herlache Gulbrandsen
Publisher :
ISBN 13 :
Total Pages : 131 pages
Book Rating : 4.:/5 (56 download)
Download or read book Relative Yields of Antiparticles to Particles in Au+Au Collisions at 130 and 200 GeV Per Nucleon Pair written by Kristján Herlache Gulbrandsen and published by . This book was released on 2004 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: Au+Au collisions at [square root of] [superscript]s nn = 130 and 200 GeV at the Relativistic Heavy Ion Collider have opened a new energy regime for studying nucleus-nucleus collisions. A search for the formation of a phase of matter in which quarks and gluons interact strongly over an extended deconfined volume is of primary importance. The PHOBOS detector was constructed to measure many observables at RHIC. The primary subsystem used in this analysis is the PHOBOS spectrometer. The spectrometer is a multiplane silicon pad detector which detects particles traversing its pads as they propagate through a strong magnetic field. The hit positions are used along with energy loss information in the silicon pads to determine both the momentum and velocity of the particles, allowing for the identification of the particle species. One of the most basic pieces of information to be determined is the baryochemical potential of the system. This information has been determined through the measurement of the relative yields of antiparticles to particles in RHIC collisions ... These values are compared to model predictions and are used to evaluate the contribution of baryon transport relative to particle production in determining the yields of baryon at midrapidity in central Au+Au collisions at RHIC energies.
Author : Michael Richard Lomnitz
Publisher :
ISBN 13 :
Total Pages : 189 pages
Book Rating : 4.:/5 (126 download)
Download or read book Measurement of Charmed Meson Azimuthal Anisotropy in Au+Au Collisions at a Center of Mass Energy of 200 GeV Per Nucleon Pair at RHIC written by Michael Richard Lomnitz and published by . This book was released on 2016 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt:
