Observation of Exclusive Electron-Positron Production in Hadron-Hadron Collisions

Abstract

We present the first observation of exclusive $e^{+}{e}^{-}$ production in hadron-hadron collisions, using $p\bar{p}$ collision data at \mbox{$\sqrt{s}=1.96$ TeV} taken by the Run II Collider Detector at Fermilab, and corresponding to an integrated luminosity of \mbox{532 pb${}^{-1}$}. We require the absence of any particle signatures in the detector except for an electron and a positron candidate, each with transverse energy {$E_T>5$ GeV} and pseudorapidity {$|\eta |<2$}. With these criteria, 16 events are observed compared to a background expectation of {$1.9\pm 0.3$} events. These events are consistent in cross section and properties with the QED process \mbox{$p\bar{p}\to p+e^{+}{e}^{-}+\bar{p}$} through two-photon exchange. The measured cross section is \mbox{$1.6_{-0.3}^{+0.5}(\mathrm{stat})\pm 0.3(\mathrm{syst})$ pb}. This agrees with the theoretical prediction of {$1.71\pm 0.01$ pb}.

7 pages, 2 figures, version 2 is shortenend for PRL with added references

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