Distributions of Transverse Energy, Protons and Mesons from Au+Au Collisions at 11.6A GeV PDF Download
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Languages : en
Pages : 4
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Preliminary results of measurements of distributions of transverse energy, protons and charged mesons from Au+Au at 11.6A GeV/c are presented and compared to corresponding results from Si+A.
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Languages : en
Pages : 4
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Preliminary results of measurements of distributions of transverse energy, protons and charged mesons from Au+Au at 11.6A GeV/c are presented and compared to corresponding results from Si+A.
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Languages : en
Pages : 6
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The highest net baryon density possible in the laboratory--up to ten times normal nuclear density--is expected in the central region of collisions of heavy nuclei (A ≈ 200) at energies near 10 GeV per nucleon. The transverse energy (E{sub T}) distribution, as well as yields of identified particles (?, K+ and protons), from 197Au + 197Au at 11.64A GeV/c are presented. Two key observations are a large degree of proton s̀̀topping, ̀̀indicating multiple scatterings of the incident nucleons, and a proportional relationship of the pion production to the number of participating nucleons. Strangeness enhancement, a proposed signature of the quark-gluon plasma, is studied via the K+/?+ ratio, which achieves the value of 21% without a strong centrality dependence. Comparisons to similar data taken with a 14.6A GeV/c beam of 28Si are made.
Author: Conor Henderson
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Languages : en
Pages : 322
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Transverse momentum (PT) distributions for pions, kaons, protons and antiprotons have been measured near mid-rapidity for Au+Au collisions at sNN = 62.4 GeV using the PHOBOS detector at the Relativistic Heavy-Ion Collider (RHIC) in Brookhaven National Laboratory. Particle identification is performed using the PHOBOS Time-of-Flight plastic scintillator walls and specific energy loss in the multi-layer silicon Spectrometer, which is also used for track reconstruction and momentum-determination. The spectra are corrected for all detector-dependent effects, including feed-down from weak decays. At PT 3 GeV/c, protons are measured to be the dominant species of charged hadrons and scale much faster with respect to collision centrality than mesons. This behaviour at 62.4 GeV is found to be remarkably similar to that observed in Au+Au collisions at 200 GeV, an interesting observation which should serve as an important constraint on the various mechanisms which have been proposed to describe particle production over this PT range. Baryon stopping, the transport of baryon number from intial beam rapidity, is explored through the net proton (p - p) yields at mid-rapidity. These results fill a large gap between the SPS and higher RHIC energies and as such form an important set of data for comparing to models of baryon transport mechanisms.
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Languages : en
Pages : 15
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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.
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Languages : en
Pages : 15
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Transverse energy (E{sub T}) distributions have been measured for Au+Au collisions at √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: Biswas Sharma
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Languages : en
Pages : 74
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This thesis presents an analysis of the transverse energy resulting from the collisions of gold nuclei at the Relativistic Heavy Ion Collider in Brookhaven National Laboratory. The transverse momentum distributions available from the STAR detector corresponding to nine different centralities for eight different identified particles, [pie]±̳ [pions, anti-pions], K±̳ [kaons, anti-kaons], [Lambda]±̳ [lambdas, anti-lambdas], p [protons], and p̅ [anti-protons], resulting from the collisions at five different center-of-mass energies per nucleon -- 7.7, 11.5, 19.6, 27, and 39 GeV -- are used in the calculations of the corresponding transverse energies. The results, when compared with the calorimetric transverse energy measurement from the PHENIX detector, show discrepancies of up to 2.83 [sigma] [standard deviations].
Author: Roppon Picha
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Languages : en
Pages : 406
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Languages : en
Pages :
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Author: David William Kleinjan
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ISBN: 9781303859892
Category : Heavy ion collisions
Languages : en
Pages : 161
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The measurement of transverse single spin asymmetries provides insight into the structure of the nucleon. Originally expected to be small, results from PHENIX and other experiments show significant asymmetries in the forward momentum direction of the polarized proton over a wide range of center-of-mass energies. Several mechanisms have been proposed that attempt to explain these asymmetries, which include initial and final state effects based on transverse momentum dependent distributions and perturbative Quantum Chromodynamic (pQCD) calculations at higher twist. Studying the species, and the kinematic dependencies of these transverse single spin asymmetries will help to disentangle the origin of the observed asymmetries. Using the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC), the transverse single spin asymmetry (A N ) of inclusive eta mesons produced from transversely polarized proton-proton collisions at center of mass energy of 200 GeV at forward rapidity is measured. In addition, the predictive power of pQCD to explain this asymmetry is tested via the measurement of the eta meson Cross Section.
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Author: Hong Xiang
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ISBN:
Category : Heavy ion collisions
Languages : en
Pages : 322
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