Thrust jet analysis of deep inelastic large rapidity gap events
Nov, 199723 pages
Published in:
- Eur.Phys.J.C 1 (1998) 495-507
e-Print:
- hep-ex/9711006 [hep-ex]
Report number:
- DESY-97-210
Experiments:
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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 < Q2 < 100 GeV2, grows with hadronic mass M_X 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(see)=MX, but with lower values of thrust in the ep data. The data cannot be described by interpreting the dissociated system X as a qqbar state but inclusion of a substantial fraction of qqbarg parton configurations leads naturally to the observed properties. The soft colour exchange interaction model does not describe the data.Note:
- 22 pages, 7 Figures, submitted to Z. Phys. C Report-no: DESY 97-210
- positron p: colliding beams
- positron p: deep inelastic scattering
- jet: photoproduction
- rapidity: gap
- photon: dissociation
- event shape analysis: thrust
- jet: alignment
- mass: hadronic
- transverse momentum: spectrum
- color: exchange
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