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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Because the two photon cross section is proportional to Z[sup 4], heavy ion colliders offer an unmatched luminosity. However, because nuclei have finite sizes, the photon spectrum is gradually cut off by a nuclear form factor. For RHIC, this cutoff occurs at a few GeV; below this energy, RHIC will have the highest[gamma][gamma] luminosity in the world when it turns on. In addition to the high rates, because Z[alpha][approximately] 0.6, the nuclear environment provides a window to strong field QED and new phenomena like multiple pair production. To study[gamma][gamma] physics, regions where the nuclei interact hadronically must be avoided; this leads to roughly a factor of two loss in usable luminosity. The rates expected by the Solenoidal Tracker at RHIC (STAR) collaboration will be given. Backgrounds will be discussed, along with several rejection techniques.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Because the two photon cross section is proportional to Z[sup 4], heavy ion colliders offer an unmatched luminosity. However, because nuclei have finite sizes, the photon spectrum is gradually cut off by a nuclear form factor. For RHIC, this cutoff occurs at a few GeV; below this energy, RHIC will have the highest[gamma][gamma] luminosity in the world when it turns on. In addition to the high rates, because Z[alpha][approximately] 0.6, the nuclear environment provides a window to strong field QED and new phenomena like multiple pair production. To study[gamma][gamma] physics, regions where the nuclei interact hadronically must be avoided; this leads to roughly a factor of two loss in usable luminosity. The rates expected by the Solenoidal Tracker at RHIC (STAR) collaboration will be given. Backgrounds will be discussed, along with several rejection techniques.
Author: Publisher: ISBN: Category : Languages : en Pages : 17
Book Description
Ultra-relativistic heavy-ions carry strong electromagnetic and nuclear fields. Interactions between these fields in peripheral nucleus-nucleus collisions can probe many interesting physics topics. This presentation will focus on coherent two-photon and photonuclear processes at RHIC. The rates for these interactions will be high. The coherent coupling of all the protons in the nucleus enhances the equivalent photon flux by a factor Z2 up to an energy of (almost equal to) 3 GeV. The plans for studying coherent interactions with the STAR experiment will be discussed. Experimental techniques for separating signal from background will be presented.
Author: Publisher: ISBN: Category : Languages : en Pages : 5
Book Description
This presentation will show the feasibility of studying two-photon interactions in the STAR experiment at RHIC. Signals, detection efficiencies, backgrounds, triggering and analysis techniques will be discussed.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Two photon processes induced by heavy ion collisions have been considered. An approximate formalism for calculation is derived. The event rate is interesting at low-photon-photon mass but is limited by the form factor of the nuclei at high mass. The event rate is compared with that at LEP and found to be favorable at the mass of charm mesons but unfavorable at higher masses. It is further noted that two pomeron processes are similar in configuration and are prolific at low pomeron-pomeron masses. 3 refs., 8 figs.
Author: Publisher: ISBN: Category : Languages : en Pages : 9
Book Description
The possibilities for two-photon physics at the coming generation of heavy ion colliders is discussed. Particular attention is given to both e, e− production and resonance production of the Higgs particle. For e, e− production the inadequacy of traditional perturbation theory is outlined, and through of the introduction of approximations valid for heavy ions it is shown how to sum a class of non-perturbative diagrams. The role of the nuclear form factor in suppressing the cross section for the heaviest resonances is also discussed. It is shown how this latter point affects the two-photon cross sections for W+, W− and Higgs production at RHIC, LHC and SSC energies.
Author: Publisher: ISBN: Category : Languages : en Pages : 24
Book Description
Recent experimental results in two-photon physics are reviewed. Possibilities for future experimentation at high [gamma][gamma] collision energies are discussed. 95 refs., 12 figs., 7 tabs.
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Author: F. Kapusta
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Author: A. Schäfer
Author: Hermann Kolanoski
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