| Title: | MEASUREMENT OF THE CROSS-SECTION FOR THE  PROCESS AT  AT LEP
Work supported by Department of Energy contracts DE-FG03-95ER-40894 and DE-AC03-76SF-00515. |
| DOI No: | 10.1142/9789812777157_0044 |
| Source: | PHOTON 2001 (pp 223-226)
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| Author(s): | T. BARILLARI
University of Colorado, Boulder, USA
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| Abstract: | The OPAL detector at LEP has been used to study the exclusive production of proton antiproton pairs in the collisions of two quasi-real photons using data taken at  and 189 GeV. The results here presented are for γγ invariant masses, W, in the range 2.15 GeV < W < 3.95 GeV. The cross-section measurements are compared with previous data and with recent analytic calculations based on the quark-diquark model predictions. |
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