Event shape analysis of multihadronic final states in deep inelastic rapidity gap events at HERA

A global event shape analysis of the multihadronic final states observed in deep inelastic scattering (DIS) with a large forward rapidity gap (LRG) is performed in the range Q2≥5 GeV2, 160 GeV≤W≤250 GeV and ηmax≤1.8. Particular emphasis is paid to the dependence of these variables, measured in the γ*-pomeron rest frame, upon MX, the mass of the hadronic final state. With increasing MX the multihadronic final states become planar. The broadening effects exhibited by the data can be described by including a gluon density in models where the pomeron has a partonic structure or alternatively by considering a direct coupling of the pomeron to quark and gluon pairs