Electron-positron production in ultra-peripheral heavy-ion collisions with the STAR experiment

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This thesis presents a measurement of the cross-section of the purely electromagnetic production of e{sup +}e{sup -} pairs accompanied by mutual nuclear Coulomb excitation AuAu {yields} Au*Au* + e{sup +}e{sup -}, in ultra-peripheral gold-gold collisions at RHIC at the center-of-mass collision energy of {radical}S{sub NN} = 200 GeV per nucleon. These reactions were selected by detecting neutron emission by the excited gold ions in the Zero Degree Calorimeters. The charged tracks in the e{sup +}e{sup -} events were reconstructed with the STAR Time Projection Chamber. The detector acceptance limits the kinematical range of the observed e{sup +}e{sup -} pairs; therefore ... continued below

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107 pages

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Morozov, Vladimir Borisovitch August 1, 2003.

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Description

This thesis presents a measurement of the cross-section of the purely electromagnetic production of e{sup +}e{sup -} pairs accompanied by mutual nuclear Coulomb excitation AuAu {yields} Au*Au* + e{sup +}e{sup -}, in ultra-peripheral gold-gold collisions at RHIC at the center-of-mass collision energy of {radical}S{sub NN} = 200 GeV per nucleon. These reactions were selected by detecting neutron emission by the excited gold ions in the Zero Degree Calorimeters. The charged tracks in the e{sup +}e{sup -} events were reconstructed with the STAR Time Projection Chamber. The detector acceptance limits the kinematical range of the observed e{sup +}e{sup -} pairs; therefore the measured cross-section is extrapolated to 4{pi} with the use of Monte Carlo simulations. We have developed a Monte Carlo simulation for ultra-peripheral e{sup +}e{sup -} production at RHIC based on the Equivalent Photon Approximation, the lowest-order QED e{sup +}e{sup -} production cross-section by two real photons and the assumption that the mutual nuclear excitations and the e{sup +}e{sup -} production are independent (EPA model). We compare our experimental results to two models: the EPA model and a model based on full QED calculation of the e{sup +}e{sup -} production, taking the photon virtuality into account. The measured differential cross-section d{sigma}/dM{sub inv} (M{sub inv} - e{sup +}e{sup -} invariant mass) agrees well with both theoretical models. The measured differential cross-section d{sigma}/dp{sub {perpendicular}}{sup tot} (p{sub {perpendicular}}{sup tot} - e{sup +}e{sup -} total transverse momentum) favors the full QED calculation over the EPA model.

Physical Description

107 pages

Notes

INIS; OSTI as DE00817249

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  • Other Information: TH: Thesis (Ph.D.); Submitted to the University of California, Berkeley, CA (US)

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  • Report No.: LBNL--53583
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 817249
  • Archival Resource Key: ark:/67531/metadc734830

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • August 1, 2003

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • April 4, 2016, 3:12 p.m.

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Morozov, Vladimir Borisovitch. Electron-positron production in ultra-peripheral heavy-ion collisions with the STAR experiment, thesis or dissertation, August 1, 2003; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc734830/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.