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Silverstein, S , Smith, W H , Vaiciulis, A , Wodarczyk, M , Tsurugai, T , Bhadra, S , Cardy, M L , Fagerstroem, C P , Frisken, W R , Furutani, K M , Khakzad, M , Murray, W N and Schmidke, W B (1996) Rapidity gaps between jets in photoproduction at HERA. Physics Letters B, 369 (1).
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Photoproduction events which have two or more jets have been studied in the W-gamma P range 135 GeV < W-gamma P < 280 GeV with the ZEUS detector at HERA, A class of events is observed with little hadronic activity between the jets, The jets are separated by pseudorapidity intervals (Delta eta) Of up to four units and have transverse energies greater than 6 GeV. A gap is defined as the absence between the jets of particles with transverse energy greater than 300 MeV. The fraction of events containing a gap is measured as a function of Delta eta. It decreases exponentially as expected for processes in which colour is exchanged between the jets, up to a value of Delta eta similar to 3, then reaches a constant value of about 0.1. The excess above the exponential fall-off can be interpreted as evidence for hard diffractive scattering via a strongly interacting colour singlet object.
This is a Submitted version This version's date is: 15/2/1996 This item is not peer reviewed
https://repository.royalholloway.ac.uk/items/02304231-35d3-b54d-124e-7b88e35de097/1/
Deposited by Research Information System (atira) on 30-Jul-2012 in Royal Holloway Research Online.Last modified on 30-Jul-2012