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Observation of highly virtual photon-photon collisions to hadrons at TRISTAN

Collaboration
Dec, 1995
14 pages
Published in:
  • Phys.Lett.B 368 (1996) 299-303
e-Print:
DOI:
Report number:
  • KEK-PREPRINT-95-179,
  • OCU-HEP-95-02,
  • NWU-HEP-95-03,
  • TUAT-HEP-95-01,
  • DPNU-95-22,
  • PU-95-697
Experiments:
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Abstract:
We have observed highly virtual (Q 2>1.05GeV 2Q~2>1.05GeV~2) photon-photon collisions to hadronic final states at se +e −=58GeV\sqrt{s_{e~+e~-}}=58GeV. The integrated luminosity of the data sample was 241pb −1~{-1}. Both scattered beam-electrons and scattered beam-positrons were detected using low-angle calorimeters (i.e., both photons were highly virtual, ``double-tag"); we obtained 115 hadronic events with an estimated background of 10.2±1.110.2\pm1.1. The cross section obtained was 4.11±0.664.11\pm0.66pb in the 2<Wγγ<252<W_{\gamma \gamma}<25 GeV and Q 2γ,min>2Q~2_{\gamma, min}>2 GeV region, while the lowest order quark-parton model predicted 3.00pb.
Note:
  • 13.65.+i
  • 12.38.Qk
  • Photon-photon collision
  • Hadronic final state
  • Double-tag
  • Virtual photon
  • Total cross section
  • photon photon: interaction
  • interaction: photon photon
  • electron positron: colliding beams
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