Observation of Highly Virtual Photon-Photon Collisions to Hadrons at TRISTAN

Details Observation of Highly Virtual Photon-Photon Collisions to Hadrons at TRISTAN Observation of Highly Virtual Photon-Photon Collisions to Hadrons at TRISTAN

1995-12-25

arxiv.org/abs/hep-ex/9512010v1

Phys.Lett. B368 (1996) 299-303

Physics

High Energy Physics

High Energy Physics - Experiment

14 pages, latex (revtex), 2 figures, available at http://topsun1.kek.jp/~enomoto/dtag.ps

Scientific paper

10.1016/0370-2693(95)01583-3

We have observed highly virtual ($Q^2>1.05 GeV^2$) photon-photon collisions to hadronic final states at $\sqrt{s_{e^+e^-}}=58 GeV$. The integrated luminosity of the data sample was 241pb$^{-1}$. 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 $10.2\pm1.1$. The cross section obtained was $4.11\pm0.66$pb in the $22$ GeV region, while the lowest order quark-parton model predicted 3.00pb.

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