Measurement Of Non Photonic Electron Azimuthal Anisotropy Upsilon Subscript 2 From Au Au Collisions At Formula
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Measurement Of Non Photonic Electron Azimuthal Anisotropy Upsilon Subscript 2 From Au Au Collisions At Formula
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Author : Weijiang Dong
language : en
Publisher:
Release Date : 2006
Measurement Of Non Photonic Electron Azimuthal Anisotropy Upsilon Subscript 2 From Au Au Collisions At Formula written by Weijiang Dong 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.
Systematic Study Of Azimuthal Anisotropy In Cu Cu And Au Au Collisions At U221a Snn
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Author :
language : en
Publisher:
Release Date : 2015
Systematic Study Of Azimuthal Anisotropy In Cu Cu And Au Au Collisions At U221a Snn 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 have studied the dependence of azimuthal anisotropy v2 for inclusive and identified charged hadrons in Au+Au and Cu+Cu collisions on collision energy, species, and centrality. The values of v2 as a function of transverse momentum pT and centrality in Au+Au collisions at √sNN=200 and 62.4 GeV are the same within uncertainties. However, in Cu+Cu collisions we observe a decrease in v2 values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both Au+Au and Cu+Cu collisions we find that v2 depends both on eccentricity and the number of participants, Npart. We observe that v2 divided by eccentricity (?) monotonically increases with Npart and scales as N1/3part. Thus, the Cu+Cu data at 62.4 GeV falls below the other scaled v2 data. For identified hadrons, v2 divided by the number of constituent quarks nq is independent of hadron species as a function of transverse kinetic energy KET=mT–m between 0.1KEsubT/sub/nsubq/sub1 GeV. Combining all of the above scaling and normalizations, we observe a near-universal scaling, with the exception of the Cu+Cu data at 62.4 GeV, of vsub2/sub/(nsubq/sub∙????????Nsup1/3/supsubpart/sub) vs KEsubT/sub/n
Azimuthal Anisotropy In Au Au Collisions At Square Root S Sub Nn
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Author :
language : en
Publisher:
Release Date : 2004
Azimuthal Anisotropy In Au Au Collisions At Square Root S Sub Nn written by 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 results from the STAR Collaboration on directed flow (v1), elliptic flow (v2), and the fourth harmonic (v4) in the anisotropic azimuthal distribution of particles from Au+Au collisions at (square root)s{sub NN} = 200 GeV are summarized and compared with results from other experiments and theoretical models. Results for identified particles are presented and fit with a Blast Wave model. For v2, scaling with the number of constituent quarks and parton coalescence is discussed. For v4, scaling with v22 and quark coalescence predictions for higher harmonic flow is discussed. The different anisotropic flow analysis methods are compared and nonflow effects are extracted from the data. For v2, scaling with the number of constituent quarks and parton coalescence are discussed. For v22 and quark coalescence are discussed.
Electron Hadron Azimuthal Correlations In Au Au Collisions At Formula
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Author : Bertrand Helmut Josef Biritz
language : en
Publisher:
Release Date : 2010
Electron Hadron Azimuthal Correlations In Au Au Collisions At Formula written by Bertrand Helmut Josef Biritz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Azimuthal Elliptic Anisotropy V2 Of High Pt Direct In Au Au Collisions At
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Author :
language : en
Publisher:
Release Date : 2015
Azimuthal Elliptic Anisotropy V2 Of High Pt Direct In Au Au Collisions At 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.
Systematic Study Of Azimuthal Anisotropy In Cu Cu And Au Au Collisions At Math Mrow Msqrt Msub Mi Mi Mi Mathvariant
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Author :
language : en
Publisher:
Release Date : 2015
Systematic Study Of Azimuthal Anisotropy In Cu Cu And Au Au Collisions At Math Mrow Msqrt Msub Mi Mi Mi Mathvariant 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.
Azimuthal Anisotropy Of Meson In U U And Au Au Collisions At Rhic
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Author :
language : en
Publisher:
Release Date : 2016
Azimuthal Anisotropy Of Meson In U U And Au Au Collisions 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 2016 with categories.
Dielectron Azimuthal Anisotropy At Mid Rapidity In Au Au Collisions At Root S
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Author :
language : en
Publisher:
Release Date : 2014
Dielectron Azimuthal Anisotropy At Mid Rapidity In Au Au Collisions At Root S 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 categories.
Azimuthal Anisotropy In Heavy Ion Collisions
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Author : Yadav Pandit
language : en
Publisher:
Release Date : 2012
Azimuthal Anisotropy In Heavy Ion Collisions written by Yadav Pandit and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Anisotropy categories.
STAR (Solenoidal Tracker At RHIC) is one of two large detectors along the ring of the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory. Experiments that collide heavy nuclei at high energy have been taking data at RHIC since the year 2000. The main goal of RHIC has been to search for a new phase of matter called the Quark Gluon Plasma (QGP), and to determine its properties, including the phase diagram that governs the relationship between QGP and more conventional hadronic matter. This dissertation has a particular focus on analysis of STAR measurements of the anisotropy of particle emission over a range of colliding energies, and these particular measurements are made possible by a unique application of a detector subsystem called Beam-Beam Counters (BBCs), which are placed close to the beam lines on both sides of the collision region. This project has involved development of software that uses the hit pattern of charged particles in the BBCs to determine the collision reaction plane, for use in measurements of anisotropy. Anisotropic flow sheds light on the early partonic system, and according to models, is minimally distorted during the post-partonic stages of the collision. In this anisotropic flow analysis, the estimated reaction plane of each event is reconstructed using the BBC signals, which have a large rapidity gap between them. There is also a large rapidity gap between each BBC and the STAR Time Projection Chamber (the main STAR subsystem for measuring particle tracks). These large rapidity gaps allow us to measure correlations relative to the reaction plane with the least possible systematic error from what is known as "non-flow", i.e., background correlations unrelated to the reaction plane. Flow correlations are normally reported in terms Fourier coefficients, v1, v2, etc. Di- rected flow is quantified by the first harmonic (v1) in the Fourier expansion of the particle's azimuthal distribution with respect to the reaction plane. Elliptic flow is the name given to the second harmonic (v2), and triangular flow is the name for the third harmonic (v3). These harmonic coefficients carry information on the very early stages of the collision. The v1 component is emphasized in this dissertation, and the BBC information that is a unique feature of this work is especially important for v1 measurements. Until recently, higher-order odd harmonics were overlooked. These odd flow harmonics carry valuable information about the initial-state fluctuations of the colliding system. This dissertation includes a study of the flow harmonic related to dipole asymmetry and triangularity in the initial geometry.
Measurements Of Bottom Anti Bottom Azimuthal Production Correlations In Proton Anti Proton Collisions At S 1 2
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Author :
language : en
Publisher:
Release Date : 2004
Measurements Of Bottom Anti Bottom Azimuthal Production Correlations In Proton Anti Proton Collisions At S 1 2 written by 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 authors have measured the azimuthal angular correlation of b{bar b} production, using 86.5 pb−1 of data collected by Collider Detector at Fermilab (CDF) in p{bar p} collisions at √s = 1.8 TeV during 1994-1995. In high-energy p{bar p} collisions, such as at the Tevatron, b{bar b} production can be schematically categorized into three mechanisms. The leading-order (LO) process is ''flavor creation'', where both b and {bar b} quarks substantially participate in the hard scattering and result in a distinct back-to-back signal in final state. The ''flavor excitation'' and the ''gluon splitting'' processes, which appear at next-leading-order (NLO), are known to make a comparable contribution to total b{bar b} cross section, while providing very different opening angle distributions from the LO process. An azimuthal opening angle between bottom and anti-bottom, [Delta][phi], has been used for the correlation measurement to probe the interaction creating b{bar b} pairs. The [Delta][phi] distribution has been obtained from two different methods. one method measures the [Delta][phi] between bottom hadrons using events with two reconstructed secondary vertex tags. The other method uses b{bar b} → (J/[psi]X)(lX') events, where the charged lepton (l) is an electron (e) or a muon ([mu]), to measure [Delta][phi] between bottom quarks. The b{bar b} purity is determined as a function of [Delta][phi] by fitting the decay length of the J/[psi] and the impact parameter of the l. Both methods quantify the contribution from higher-order production mechanisms by the fraction of the b{bar b} pairs produced in the same azimuthal hemisphere, f{sub toward}. The measured f{sub toward} values are consistent with both parton shower Monte Carlo and NLO QCD predictions.