Directed And Elliptic Flow In Au Au Collisions At A Center Of Mass Energy Of 19 6 Gev Per Nucleon Nucleon Pair
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Directed And Elliptic Flow In Au Au Collisions At A Center Of Mass Energy Of 19 6 Gev Per Nucleon Nucleon Pair
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Author : Michael George Anderson
language : en
Publisher:
Release Date : 2006
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 has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
Elliptic Flow In Au Au Collisions At 200 Gev Per Nucleon Pair
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Author : Carla Manuel Vale
language : en
Publisher:
Release Date : 2004
Elliptic Flow In Au Au Collisions At 200 Gev Per Nucleon Pair written by Carla Manuel Vale and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
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
Government Reports Announcements Index
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Author :
language : en
Publisher:
Release Date : 1996
Government Reports Announcements 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 1996 with Science categories.
Pseudorapidity Dependence Of Directed And Elliptic Flow In Au Au Collisions At 19 6 62 4 130 And 200 Gev Per Nucleon Pair
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Author : Joshua Brian Hamblen
language : en
Publisher:
Release Date : 2006
Pseudorapidity Dependence Of Directed And Elliptic Flow In Au Au Collisions At 19 6 62 4 130 And 200 Gev Per Nucleon Pair written by Joshua Brian Hamblen 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.
Measurement Of Elliptic Flow Coefficients And Derivation Of Reaction Plane Dependent Efficiency Of Isolated Photons And Neutral Pions In Center Of Mass Pair Energy 200 Gev Au Au Collisions At Rhic Phenix
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Author :
language : en
Publisher:
Release Date : 2014
Measurement Of Elliptic Flow Coefficients And Derivation Of Reaction Plane Dependent Efficiency Of Isolated Photons And Neutral Pions In Center Of Mass Pair Energy 200 Gev Au Au Collisions At Rhic Phenix written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Gold categories.
Collective Flow In Au Au Collisions With Incident Energies From 0 25 To 1 15 A Gev
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Author : Martin David Partlan
language : en
Publisher:
Release Date : 1994
Collective Flow In Au Au Collisions With Incident Energies From 0 25 To 1 15 A Gev written by Martin David Partlan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
Measurement Of Charmed Meson Azimuthal Anisotropy In Au Au Collisions At A Center Of Mass Energy Of 200 Gev Per Nucleon Pair At Rhic
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Author : Michael Richard Lomnitz
language : en
Publisher:
Release Date : 2016
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 has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Heavy ion collisions categories.
First Moment Of Azimuthal Anisotropy In Au Au Collisions From The Beam Energy Scan At The Relativistic Heavy Ion Collider
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Author : Prashanth Shanmuganathan
language : en
Publisher:
Release Date : 2016
First Moment Of Azimuthal Anisotropy In Au Au Collisions From The Beam Energy Scan At The Relativistic Heavy Ion Collider written by Prashanth Shanmuganathan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Hadron interactions categories.
Excited nuclear matter at high temperature and density results in the creation of a new state of matter called Quark Gluon Plasma (QGP). It is believed that the Universe was in the QGP state a few millionths of a second after the Big Bang. A QGP can be experimentally created for a very brief time by colliding heavy nuclei, such as gold, at ultra-relativistic energies. The Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory consists of two circular rings, 3.8 km in circumference, which can accelerate heavy nuclei in two counter-rotating beams to nearly the speed of light (up to 100 GeV per beam). STAR (Solenoidal Tracker At RHIC) is one of two large detectors at the RHIC facility, and was constructed and is operated by a large international collaboration made up of more than 500 scientists from 56 institutions in 12 countries. STAR has been taking data from heavy ion collisions since the year 2000. An important component of the physics effort of the STAR collaboration is the Beam Energy Scan (BES), designed to study the properties of the Quantum Chromodynamics (QCD) phase diagram in the regions where a first-order phase transition and a critical point may exist. Phase-I of the BES program took data in 2010, 2011 and 2014, using Au+Au collisions at a center-of-mass energy per nucleon pair of 7.7, 11.5, 14.5, 19.6, 27 and 39 GeV. It is by now considered a well-established fact that the QGP phase exists. However, all evidence so far indicates that there is a smooth crossover when normal hadronic matter becomes QGP and vice versa in collisions at the top energy of RHIC (and likewise at the Large Hadron Collider at the CERN laboratory in Switzerland). At these very high energies, the net density of baryons like nucleons is quite low, since there are almost equal abundances of baryons and antibaryons. It is known that net-baryon compression increases as the beam energy is lowered below a few tens of GeV. Of course, if the beam energy is too low, then the QGP phase cannot be produced at all, so it has been proposed that there is an optimum beam energy, so far unknown, where phenomena like a first-order phase transition and a critical point might be observed. On the other hand, there also exists the possibility that a smooth crossover to QGP occurs throughout the applicable region of the QCD phase diagram. Experiments are needed to resolve these questions. In this dissertation, I focus on one of the main goals of the BES program, which is to search for a possible first-order phase transition from hadronic matter to QGP and back again, using measurements of azimuthal anisotropy. The momentum-space azimuthal anisotropy of the final-state particles from collisions can be expressed in Fourier harmonics. The first harmonic coefficient is called directed flow, and reflects the strength of the collective sideward motion, relative to the beam direction, of the particles. Models tell us that directed flow is imparted during the very early stage of a collision and is not much altered during subsequent stages of the collision. Thus directed flow can provide information about the early stages when the QGP phase exists for a short time. A subset of hydrodynamic and nuclear transport model calculations with the assumption of a first-order phase transition show a prominent dip in the directed flow versus beam energy. I present directed flow and its slope with respect to rapidity, for identified particle types, namely lambda, anti-lambda and kaons as a function of beam energy for central, intermediate and peripheral collisions. The production threshold of neutral strange particles requires them to be created earlier, and these particles have relatively long mean free path. Thus these particles may probe the QGP at earlier times. In addition, new Lambda measurements can provide more insight about baryon number transported to the midrapidity region by stopping process of the nuclear collision. It is noteworthy that net-baryon density (equivalent to baryon chemical potential) depends not only on beam energy but also on collision centrality. The centrality dependence of directed flow and its slope are also studied for all BES energies for nine identified particle types, lambda, anti-lambda, neutral kaons, charged kaons, protons, anti-protons, and charged pions. These detailed results for many particle species, where both centrality and beam energy are varied over a wide range, strongly constrain models. The measurements summarized above pave the way for a new round of model refinements and subsequent comparisons with data. If the latter does not lead to a clear conclusion, the BES Phase-II program will take data in 2019 and 2020 with an upgraded STAR detector with wider acceptance, greatly improved statistics, and will extend measurements to new energy points.
Azimuthal Anisotropy In Gold Gold Collisions At 4 5 Gev Center Of Mass Energy Per Nucleon Pair Using Fixed Target Mode At The Relativistic Heavy Ion Collider
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Author : Yang Wu
language : en
Publisher:
Release Date : 2019
Azimuthal Anisotropy In Gold Gold Collisions At 4 5 Gev Center Of Mass Energy Per Nucleon Pair Using Fixed Target Mode At The Relativistic Heavy Ion Collider written by Yang Wu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Anisotropy categories.
Measurements Of Dielectron Production In Au Au Collisions At Math Mrow Msqrt Msub Mi Mi Mrow Mi N Mi Mi N Mi Mrow Msub Msqrt Mo
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Author :
language : en
Publisher:
Release Date : 2015
Measurements Of Dielectron Production In Au Au Collisions At Math Mrow Msqrt Msub Mi Mi Mrow Mi N Mi Mi N Mi Mrow Msub Msqrt Mo written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
We report on measurements of dielectron (ee−) production in Au+Au collisions at a center-of-mass energy of 200 GeV per nucleon-nucleon pair using the STAR detector at RHIC. Systematic measurements of the dielectron yield as a function of transverse momentum (pT) and collision centrality show an enhancement compared to a cocktail simulation of hadronic sources in the low invariant-mass region (Mee