Photon-photon production of lepton, quark and meson pairs in peripheral heavy ion collisions

Source: arXiv

ABSTRACT We review our recent results on exclusive production of $\mu^+ \mu^-$, heavy
quark-antiquark, and meson-antimeson pairs in ultraperipheral,
ultrarelativistic heavy ion collisions.

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Available from: Mariola Klusek-Gawenda, Sep 29, 2015
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    ABSTRACT: A higher order QED calculation of the ultraperipheral heavy ion cross section for mu+ mu- pair production at RHIC and LHC is carried out. The so-called "Coulomb corrections" lead to an even greater percentage decrease of mu+ mu- production from perturbation theory than the corresponding decrease for e+ e- pair production. Unlike the e+ e- case, the finite charge distribution of the ions (form factor) and the necessary subtraction of impact parameters with matter overlap are significant effects in calculation an observable ultraperipheral mu+ mu- total cross section.
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    ABSTRACT: We formulate and analyse a saturation model for the total gammagamma and cross-sections and for gamma(*)gamma(*) total cross-the real photon structure function F-2(gamma)(x, Q(2)). The model is based on a picture in which the gamma(*)gamma(*) section for arbitrary photon virtualities is driven by the interaction of colour dipoles into which the virtual photons fluctuate. The cross-section describing this interaction is assumed to satisfy the saturation property with the saturation radius taken from the Golec-Biernat and Wusthoff analysis of the gamma(*)p interaction at HERA. The model is supplemented by the QPM and non-pomeron reggeon contributions. The model gives a very good description of the data on the total cross-section, on the photon structure function F-2(gamma)(x, Q(2)) at low x and on the gamma(*)gamma(*) cross-section extracted from LEP double tagged events. The production of heavy flavours in gammagamma collisions is also studied. Predictions of the model for the very high energy range which will be probed at future linear colliders are given.
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