Exclusive production of π+π− and π0π0 pairs in photon-photon and in ultrarelativistic heavy ion collisions
1 Institute of Nuclear Physics PAN, PL-31-342 Cracow, Poland
2 University of Rzeszów, PL-35-959 Rzeszów, Poland
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The γγ → ππ reactions are discussed. To describe those processes, we include dipion continuum, resonances, high-energy pion-pion rescatterings, ρ meson exchange and pQCD Brodsky-Lepage mechanisms. The cross section for the production of pion pairs in photon-photon collisions in peripheral heavy ion collisions is calculated with the help of Equivalent Photon Approximaption (EPA) in the impact parameter space. We show predictions at √sNN TeV which could be measured e.g. by the ALICE collaboration at the LHC.
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