Deutron Photodissociation In Ultraperipheral Relativistic Heavyion On Deutron Collisions
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| Release | : 2003 |
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In ultraperipheral relativistic deuteron on heavy-ion collisions, a photon emitted from the heavy nucleus may dissociate the deuterium ion. We find deuterium breakup cross sections of 1.24 barns for deuterium-gold collisions at a center of mass energy of 200 GeV per nucleon, as studied at the Relativistic Heavy Ion Collider, and 2.35 barns for deuterium-lead collisions at a center of mass energy of 6.2 TeV, as proposed for the Large Hadron Collider. In the latter case, the cross section is as large as that of hadronic interactions. The estimated error is 5%. We discuss the use of this process as a luminosity monitor and a 'tag' for moderate impact parameter collisions.
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| Total Pages | : 5 |
| Release | : 2003 |
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| Author | : H. R. Schmidt |
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| Total Pages | : 74 |
| Release | : 1992 |
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| Total Pages | : 5 |
| Release | : 2004 |
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| Author | : Sudhir Bhardwaj |
| Publisher | : LAP Lambert Academic Publishing |
| Total Pages | : 136 |
| Release | : 2011-12 |
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| ISBN | : 9783847304401 |
Quantum Chromodynamics calculations on the lattice predict that at extremely high energy densities, colliding nuclear matter would undergo a phase transition to deconfined matter of quarks and gluons. The nature of transition, the temperature and the energy density at which the transition occurs depend upon the details of calculations; these depend upon the number of quark flavors introduced in the calculation. This deconfined state of quark and gluons has been named Quark Gluon Plasma(QGP). This work purports to understand the azimuthal distribution of photons produced in Cu+Cu collisions at 200 GeV with Photon Multiplicity Detector (PMD). The PMD is part of the STAR (Solenoidal Tracker At RHIC) experiment.PMD covers a pseudorapidity range of -3.7 to -2.3 with full azimuthal coverage and measures the multiplicity and spatial distribution of photons on an event-by-event basis.The value of second order azimuthal coefficient has been determined for different centralities in different pseudorapidity windows and its pseudorapidity and centrality dependence has been obtained.
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| Release | : 2008 |
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This document contains the final report for DOE grant DE-FG02-03ER41239: Modeling and Analysis of Ultra-Relativistic Heavy-Ion Collisions.
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| Release | : 2007 |
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Photoproduction reactions occur when the electromagnetic field of a relativistic heavy ion interacts with another heavy ion. The STAR collaboration presents a measurement of?° and direct??− photoproduction in ultra-peripheral relativistic heavy ion collisions at √s{sub NN} = 200 GeV. We observe both exclusive photoproduction and photoproduction accompanied by mutual Coulomb excitation. We find a coherent cross-section of?(AuAu → Au*Au*?°) = 530 ± 19 (stat.) ± 57 (syst.) mb, in accord with theoretical calculations based on a Glauber approach, but considerably below the predictions of a color dipole model. The?° transverse momentum spectrum (p{sub T}2) is fit by a double exponential curve including both coherent and incoherent coupling to the target nucleus; we find?{sub inc}/?{sub coh} = 0.29 ± 0.03 (stat.) ± 0.08 (syst.). The ratio of direct?+?− production is comparable to that observed in?p collisions at HERA, and appears to be independent of photon energy. Finally, the measured?° spin helicity matrix elements agree within errors with the expected s-channel helicity conservation.
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| Total Pages | : 4 |
| Release | : 1991 |
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We expect to complete the observations of lepton pairs with incident protons on proton and deuteron targets. The early results indicate an important fraction due to processes other than bremsstrahlung. Further high statistic runs on heavier targets (Ca on Ca) are scheduled for 1992 and possible runs for heavier ions. We expect to participate in the running and analysis for these experiments and help prepare for upgrades of the DLS system. The Hopkins group is an active member of a collaboration preparing proposals for RHIC (STAR). Our main interest is the behavior of quarks and gluons traversing the high density medium that ultimately appear in the form of jets. A program of studying the behavior of multilayer mirrors for Ring Imaging systems that can be utilized for both triggering and Cerenkov Ring determination will continue.
| Author | : David Arthur Seibert |
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| Total Pages | : 162 |
| Release | : 1988 |
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| Release | : 1995 |
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The abundances of light nuclei probe the later stages of the evolution of a system formed in a relativistic heavy-ion collision. After the system has cooled and expanded, nucleons in close proximity and moving with small relative momenta coalesce to form nuclei. Light nuclei production enables the study of several topics, including the mechanism of composite particle production, freeze-out temperature, size of the interaction region, and entropy of the system. NA44 is the only relativistic heavy-ion experiment to have both deuteron and anti-deuteron results in both pA and AA collisions and the first CERN experiment to study the physics topics addressed by d and {bar d} production.
