Research Papers in Physics and Astronomy


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Published by American Physical Society. Phys. Rev. Lett. 91, 011802 (2003). Copyright © 2003 American Physical Society. Permission to use.


We report a measurement of the fraction of events with a large pseudorapidity gap Δη within the pseudorapidity region available to the proton dissociation products X in +p→+X. For a final state of fractional momentum loss ξ and 4-momentum transfer squared t within 0.06<ξt|2 at √s=1800 [630] GeV, the fraction of events with Δη>3 is found to be 0.246±0.001 (stat)±0.042 (syst) [0.184±0.001 (stat)±0.043 (syst)]. Our results are compared with gap fractions measured in minimum bias p̅p collisions and with theoretical expectations.

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