Correlations Relative To The Reaction Plane At The Relativistic Heavy Ion Collider Based On Transverse Deflection Of Spectator Neutrons
DOWNLOAD
Download Correlations Relative To The Reaction Plane At The Relativistic Heavy Ion Collider Based On Transverse Deflection Of Spectator Neutrons PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Correlations Relative To The Reaction Plane At The Relativistic Heavy Ion Collider Based On Transverse Deflection Of Spectator Neutrons book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Charge Multiplicity Asymmetry Correlation Study Searching For Local Parity Violation At Rhic For Star Collaboration
DOWNLOAD
Author : Quan Wang
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-08-13
Charge Multiplicity Asymmetry Correlation Study Searching For Local Parity Violation At Rhic For Star Collaboration written by Quan Wang 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 2013-08-13 with Science categories.
It has been suggested that local parity violation (LPV) in Quantum Chromodynamics (QCD) would lead to charge separation of quarks by the Chiral Magnetic Effect (CME) in heavy ion collisions. Charge Multiplicity Asymmetry Correlation Study Searching for Local Parity Violation at RHIC for STAR Collaboration presents the detailed study of charge separation with respect to the event plane. Results on charge multiplicity asymmetry in Au+Au and d+Au collisions at 200 GeV by the STAR experiment are reported. It was found that the correlation results could not be explained by CME alone. Additionally, the charge separation signal as a function of the measured azimuthal angle range as well as the event-by-event anisotropy parameter are studied. These results indicate that the charge separation effect appears to be in-plane rather than out-of-plane. It is discovered that the charge separation effect is proportional to the event-by-event azimuthal anisotropy and consistent with zero in events with zero azimuthal anisotropy. These studies suggest that the charge separation effect, within the statistical error, may be a net effect of event anisotropy and correlated particle production. A potential upper limit on the CME is also presented through this data.
Dissertation Abstracts International
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2007
Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Dissertations, Academic categories.
Correlations Relative To The Reaction Plane At The Relativistic Heavy Ion Collider Based On Transverse Deflection Of Spectator Neutrons
DOWNLOAD
Author : Gang Wang
language : en
Publisher:
Release Date : 2006
Correlations Relative To The Reaction Plane At The Relativistic Heavy Ion Collider Based On Transverse Deflection Of Spectator Neutrons written by Gang Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Heavy ion collisions categories.
Modern physics is challenged by the puzzle of quark confinement in a strongly interacting system. High-energy heavy-ion collisions can experimentally provide the high energy density required to generate Quark-Gluon Plasma (QGP), a deconfined state of quark matter. For this purpose, the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory has been constructed and is currently taking data. Anisotropic flow, an anisotropy of the azimuthal distribution of particles with respect to the reaction plane, sheds light on the early partonic system and is not distorted by the post-partonic stages of the collision. Non-flow effects (azimuthal correlations not related to the reaction plane orientation) are difficult to remove from the analysis, and can lead us astray from the true interpretation of anisotropic flow. To reduce the sensitivity of our analysis to non-flow effects, we aim to reconstruct the reaction plane from the sideward deflection of spectator neutrons detected by the Zero Degree Calorimeter (ZDC). It can be shown that the large rapidity gap between the spectator neutrons used to establish the reaction plane and the rapidity region of physics interest eliminates all of the known sources of non-flow correlations. In this project, we upgrade the ZDC to make it position-sensitive in the transverse plane, and utilize the spatial distribution of neutral fragments of the incident beams to determine the reaction plane. The 2004 and 2005 runs of RHIC have provided sufficient statistics to carry out a systematic analysis of azimuthal anisotropies as a function of observables like collision system (Au+Au and Cu+Cu), beam energy (62 GeV and 200GeV), impact parameter (centrality), particle type, etc. Directed flow is quantified by the first harmonic (v1) in the Fourier expansion of the particle's azimuthal distribution with respect to the reaction plane, and elliptic flow, by the second harmonic (v2). They carry information on the very early stages of the collision. For example, the variation of directed flow with rapidity in the central rapidity region is of special interest because it might reveal a signature of a possible QGP phase. This flow study using the 1st-order reaction plane (the reaction plane determined by directed flow) reconstructed using the ZDC-SMD has minimal, if any, influence from non-flow effects or effects from flow fluctuations. The experimental results can be compared with different theoretical model predictions such as AMPT, RQMD, UrQMD and hydrodynamic models. We can also use our flow results to test the hypothesis of limiting fragmentation - the effect whereby particle emission as a function of rapidity in the vicinity of beam rapidity appears unchanged over a wide range of beam energy.
Two Particle Correlations In Angular And Momentum Space In Heavy Ion Collisions At Star
DOWNLOAD
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.
Small Relative Momentum Proton Correlations In Relativistic Heavy Ion Collisions
DOWNLOAD
Author : Vasilios A. Vutsadakis
language : en
Publisher:
Release Date : 1992
Small Relative Momentum Proton Correlations In Relativistic Heavy Ion Collisions written by Vasilios A. Vutsadakis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
Multiparticle Correlations In Pb Pb Collisions At P Square Root Symbol Nn
DOWNLOAD
Author : Jocelyn Mlynarz
language : en
Publisher:
Release Date : 2014
Multiparticle Correlations In Pb Pb Collisions At P Square Root Symbol Nn written by Jocelyn Mlynarz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Condensed matter categories.
Quantum Chromodynamics, which describe the interactions of quarks and gluons, have been found not to violate global parity symmetry. However, the possibility of local parity violations due to transitions in the vacuum state of QCD is not excluded. The effects of these parity violations could be measured in the hot and dense medium created in the ultrarelativistic heavy ion collisions experiment conducted at the Large Hadron Collider, called a Quark-Gluon Plasma, in which the quarks that compose most of ordinary matter are deconfined. In the strong magnetic fields which permeate the QGP in non-central collisions, parity violation would express itself as a charge asymetry with respect to the reaction plane, a phenomenon called the Chiral Magnetic Effect. The measurements of the charge-dependent correlations in a heavy-ion collisions allows to experimentally probe effects of the CME. These measurements are conducted via the use of the second harmonic two-particle correlator with respect to the reaction plane, $\langle\cos(\phi_{a}+\phi_{b}-2\psi)\rangle$ The background affecting these measurements is the consequence of an interplay of strong anisotropic flow and correlations unrelated to the CME. Correlations with respect to the fourth harmonic, $\langle\cos(2\phi_{a}+2\phi_{b}-4\psi)\rangle$, are insensitive to the CME and can be used to estimate the magnitude of these background effects. In this thesis, we present results from charge-dependent correlations with respect to both the second and fourth harmonic event planes measured in Pb+Pb collisions at $\sqrt{s_{NN}} = 2.76$ TeV at the LHC using data from the ALICE detector. We also present calculations of the ratio of the fourth to second harmonics based on the blast-wave model, which serve as a baseline to understand how these background effects scale between one harmonic and another.
Statistical Correlations In Relativistic Heavy Ion Collisions
DOWNLOAD
Author : Silvio Petriconi
language : en
Publisher:
Release Date : 2003
Statistical Correlations In Relativistic Heavy Ion Collisions written by Silvio Petriconi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Correlation (Statistics) categories.
Neutral Kaon Correlations In Au Au Collisions At Center Of Mass Energy Of 200 Gev Per Nucleon Pair
DOWNLOAD
Author : Selemon Bekele
language : en
Publisher:
Release Date : 2004
Neutral Kaon Correlations In Au Au Collisions At Center Of Mass Energy Of 200 Gev Per Nucleon Pair written by Selemon Bekele and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Heavy ion collisions categories.
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.
Pion Correlations In Relativistic Heavy Ion Collisions At Hiss
DOWNLOAD
Author : William Bennett Christie
language : en
Publisher:
Release Date : 1990
Pion Correlations In Relativistic Heavy Ion Collisions At Hiss written by William Bennett Christie and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Heavy ion collisions categories.
Modeling Relativistic Heavy Ion Collisions
DOWNLOAD
Author : Sen Cheng
language : en
Publisher:
Release Date : 2002
Modeling Relativistic Heavy Ion Collisions written by Sen Cheng and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Hadron interactions categories.