Three jet production in diffractive deep inelastic scattering at HERA

Three-jet production in the reaction ep → eXp has been studied with the ZEUS detector at HERA using an integrated luminosity of 42.74 pb −1 .The data were measured in the kinematic region 5< Q 2 <100 GeV 2 , 200< W <250 GeV and 23< M X <40 GeV. The diffractive signal was selected by requiring a large rapidity gap in the outgoing proton direction. Jets were reconstructed in the centre-of-mass system of X using the exclusive k T -algorithm. A sample of three-jet events in diffraction has been identified. Differential cross sections were measured as a function of the jet pseudorapidity and jet transverse momentum with respect to the virtual photon–pomeron axis. The jets going in the pomeron direction are broader than those going in the virtual-photon direction. This is consistent with models predicting that gluons are predominantly produced in the pomeron direction and quarks in the virtual-photon direction.

Note:

14 pages, 5 figures and 7 tables. Submitted to Physics Letters B

electron p: colliding beams
positron p: colliding beams
positron p: deep inelastic scattering
diffraction
jet: multiple production
final state: (3jet)
rapidity: gap
differential cross section: rapidity dependence
transverse momentum dependence
pomeron: exchange

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