2018 Impact factor 4.843
Particles and Fields
Eur. Phys. J. C 1, 495-507

Thrust jet analysis of deep-inelastic large-rapidity-gap events

H1 Collaboration, C. Adloff35 et al.

35 Fachbereich Physik, Bergische Universität Gesamthochschule Wuppertal, D-42097 Wuppertal, Germany

Received: 18 November 1997

Abstract
A thrust analysis of Large-Rapidity-Gap events in deep-inelastic ep collisions is presented, using data taken with the H1 detector at HERA in 1994. The average thrust of the final states X, which emerge from the dissociation of virtual photons in the range $10 < Q^2 < 100~{\rm GeV}^2$,grows with hadronic mass MX and implies a dominant 2-jet topology. Thrust is found to decrease with growing Pt, the thrust jet momentum transverse to the photon-proton collision axis. Distributions of Pt2 are consistent with being independent of MX. They show a strong alignment of the thrust axis with the photon-proton collision axis, and have a large high-Pt tail. The correlation of thrust with MX is similar to that in e+e-annihilation at $\sqrt s_{ee}=M_X$,but with lower values of thrust in the ep data. The data cannot be described by interpreting the dissociated system X as a $q\bar{q}$state but inclusion of a substantial fraction of $q\bar{q}g$parton configurations leads naturally to the observed properties. The soft colour exchange interaction model does not describe the data.


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