Department of Physics and Astronomy: Publications and Other Research


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Published by American Physical Society. Phys. Rev. Lett. 81, 5278 (1998). Copyright © 1998 American Physical Society. Permission to use.


We report a measurement of the fraction of dijet events with a rapidity gap between jets produced by color-singlet exchange in p̅p collisions at √s =630 GeV at the Fermilab Tevatron. In events with two jets of transverse energy ETjet > 8 GeV, pseudorapidity in the range 1.8 <|ηjet | < 3.5 and η1 η2 < 0, the color-singlet exchange fraction is found to be R=[2.7 ± 0.7(stat) ± 0.6(syst)]%. Comparisons are made with results obtained at √s =1800 GeV and with theoretical expectations.

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