22 research outputs found

    Yang-Mills Radiation in Ultra-relativistic Nuclear Collisions

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    The classical Yang-Mills radiation computed in the McLerran-Venugopalan model is shown to be equivalent to the gluon bremsstrahlung distribution to lowest order in pQCD. The classical distribution is also shown to match smoothly onto the conventional pQCD mini-jet distribution at a scale characteristic of the initial parton transverse density of the system. The atomic number and energy dependence of that scale is computed from available structure function information. The limits of applicability of the classical Yang-Mills description of nuclear collisions at RHIC and LHC energies are discussed.Comment: 21 pages (Latex) including 2 postscript figures via psfi

    ATLAS detector and physics performance: Technical Design Report, 1

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    QCD Evolution Equations for High Energy Partons in Nuclear Matter

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    We derive a generalized form of Altarelli-Parisi equations to decribe the time evolution of parton distributions in a nuclear medium. In the framework of the leading logarithmic approximation, we obtain a set of coupled integro- differential equations for the parton distribution functions and equations for the virtuality (``age'') distribution of partons. In addition to parton branching processes, we take into account fusion and scattering processes that are specific to QCD in medium. Detailed balance between gain and loss terms in the resulting evolution equations correctly accounts for both real and virtual contributions which yields a natural cancellation of infrared divergences.Comment: 47 pages, RevTeX, uuencoded file, 9 figures available on request, DUKE-TH-93-60/ NSF-ITP-93-14

    ATLAS

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