Production of a pion in association with a high-Q**2 dilepton pair in antiproton-proton annihilation at GSI-FAIR

Oct, 2007
5 pages
Published in:
  • Phys.Rev.D 76 (2007) 111502
e-Print:

Citations per year

2007201120152019202202468
Abstract: (arXiv)
We evaluate the cross section for anti-p p -> l+ l- pi0 in the forward direction and for large lepton pair invariant mass. In this kinematical region, the leading-twist amplitude factorises into a short-distance matrix element, long-distance dominated antiproton Distribution Amplitudes and proton to pion Transition Distribution Amplitudes (TDA). Using a modelling inspired from the chiral limit for these TDAs, we obtain a first estimate of this cross section, thus demonstrating that this process can be measured at GSI-FAIR.
  • 12.38.Bx
  • 25.43.+t
  • anti-p p: annihilation
  • lepton: pair production
  • pi0: associated production
  • small-angle
  • mass spectrum: dilepton
  • differential cross section: momentum transfer
  • energy dependence
  • proposed experiment