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Two Photon Production of Final States With a ppˉp \bar{p} Pair

Collaboration
•
Dec, 1988
16 pages
Published in:
  • Z.Phys.C 42 (1989) 543
DOI:
Report number:
  • DESY-88-194
Experiments:
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Abstract: (Springer)
Two-photon production of the exclusive final statesppˉ\bar p+nπ (n=0, 1, 2, and 3) has been investigated using the ARGUS detector at thee+e− storage ring DORIS II at DESY. The reactionsγγ→ppˉ\bar pπ andγγ→ppˉ\bar pπ+π−π0 have been observed for the first time, as have theΔ++ andΔ++‾\overline {\Delta ^{ ++ } } baryons in the final stateppˉ\bar pπ+π−. No evidence was found forΔ++Δ++‾\overline {\Delta ^{ ++ } } production. Topological cross sections for two-photon production ofppˉ\bar p,ppˉ\bar pπ0,ppˉ\bar pπ+π− andppˉ\bar pπ+π−π0, as well as the crosssection forγγ→Δ++pˉ\bar pπ+π−+c.c., have been measured. Upper limits are given for the cross section forγγ→Δ0Δ0‾\overline {\Delta ^0 } ,γγ→Δ++Δ++‾\overline {\Delta ^{ ++ } } andγγ→ΛΛˉ\bar \Lambda .
  • ELECTRON POSITRON: COLLIDING BEAMS
  • COLLIDING BEAMS: ELECTRON POSITRON
  • ELECTRON POSITRON: INELASTIC SCATTERING
  • INELASTIC SCATTERING: ELECTRON POSITRON
  • EXCHANGE: TWO-PHOTON
  • TWO-PHOTON: EXCHANGE
  • PHOTON PHOTON: EXCLUSIVE REACTION
  • HADRON: MULTIPLE PRODUCTION
  • MULTIPLE PRODUCTION: HADRON
  • P: ELECTROPRODUCTION