1208.4623 (Mariola Klusek-Gawenda et al.)

Exclusive production of $π^+π^-$ and $π^0π^0$ pairs in
photon-photon and in ultrarelativistic heavy ion collisions    [PDF]

Mariola Klusek-Gawenda, Antoni Szczurek

The $\gamma\gamma\to\pi\pi$ reactions are discussed. To describe those processes, we include dipion continuum, resonances, high-energy pion-pion rescatterings, $\rho$ 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 $\sqrt{s_{NN}}=3.5$ TeV which could be measured e.g. by the ALICE collaboration at the LHC.

View original: http://arxiv.org/abs/1208.4623