Heavy Ion e+ e- Pairs to All Orders in Z alpha

Details Heavy Ion e+ e- Pairs to All Orders in Z alpha Heavy Ion e+ e- Pairs to All Orders in Z alpha

2005-10-27

arxiv.org/abs/nucl-th/0510083v1

Acta Phys.Hung. A27 (2006) 323-326

Physics

Nuclear Physics

Nuclear Theory

4 pages, poster proceedings from Quark Matter 2005

Scientific paper

10.1556/APH.27.2006.2-3.31

The heavy ion cross section for continuum e+ e- pair production has been calculated to all orders in Z alpha. Comparison is made with available CERN SPS and RHIC STAR data. Computed cross sections are found to be reduced from perturbation theory with increasing charge of the colliding heavy ions and for all energy and momentum regions investigated. Au or Pb total cross sections are reduced by 28% (SPS), 17% (RHIC),and 11% (LHC). For very high energy (E_e+, E_e- > 3 GeV) forward pairs at LHC the reduction from perturbation theory is a bit larger (17%). Use of zero degree calorimeter triggering (and thus small impact parameter weighting) makes impact parameter representation of exact pair production useful. Preliminary exact calculations in the zero impact parameter limit show a much larger reduction from perturbation theory (about 40%) at both RHIC and LHC.

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