Properties of hadronic final states in diffractive deep inelasticepscattering at DESY HERA
Copyright policy )Properties of hadronic final states in diffractive deep inelasticepscattering at DESY HERA
Characteristics of the hadronic final state of diffractive deep inelastic scattering events, ep -> eXp, were studied in the kinematic range 4 < M_X < 35 GeV, 4 < Q^2 < 150 GeV^2, 70 < W < 250 GeV and 0.0003 < x_pom < 0.03 with the ZEUS detector at HERA using an integrated luminosity of 13.8 pb^{-1}. The events were tagged by identifying the diffractively scattered proton using the leading proton spectrometer. The properties of the hadronic final state, X, were studied in its center-of-mass frame using thrust, thrust angle, sphericity, energy flow, transverse energy flow and ``seagull'' distributions. As the invariant mass of the system increases, the final state becomes more collimated, more aligned and more asymmetric in the average transverse momentum with respect to the direction of the virtual photon. Comparisons of the properties of the hadronic final state with predictions from various Monte Carlo model generators suggest that the final state is dominated by qqg states at the parton level.
32 pages, 14 figures, submitted to PRD v2, (v3?): corrected author list, typo on page 2
- Argonne National Laboratory United States
- Deutsches Elektronen-Synchrotron DESY Germany
- The Ohio State University at Marion United States
- University of Amsterdam Netherlands
- Sapienza University of Rome Italy
MONTE-CARLO GENERATOR, E&E ANNIHILATION, ZEUS; LARGE-RAPIDITY-GAP; CENTRAL TRACKING DETECTOR; ZEUS BARREL CALORIMETER; MONTE-CARLO GENERATOR; E&E ANNIHILATION; GLUON BREMSSTRAHLUNG; HIGH-ENERGIES; 3-JET EVENTS; CONSTRUCTION; MULTIPLICITY, LARGE-RAPIDITY-GAP; CENTRAL TRACKING DETECTOR; ZEUS BARREL CALORIMETER; MONTE-CARLO GENERATOR; E&E ANNIHILATION; GLUON BREMSSTRAHLUNG; HIGH-ENERGIES; 3-JET EVENTS; CONSTRUCTION; MULTIPLICITY, diffraction, FOS: Physical sciences, energy flow, (quark antiquark gluon) [final state], leading particle [p], event shape analysis, 530, High Energy Physics - Experiment, LARGE-RAPIDITY-GAP, High Energy Physics - Experiment (hep-ex), electron p --> p electron (n)hadron, 3-JET EVENTS, dissociation [photon], QC, GLUON BREMSSTRAHLUNG, HIGH-ENERGIES, colliding beams [electron p], multiple production [hadron], resolved [pomeron], Research Groups and Centres\Physics\Low Temperature Physics, radiation [gluon], seagull [effect], CONSTRUCTION, Faculty of Science\Physics, MULTIPLICITY, ZEUS BARREL CALORIMETER, ZEUS, 541, CENTRAL TRACKING DETECTOR, DESY HERA Stor, QC Physics, international, pair production [quark], deep inelastic scattering [electron p], experimental results, ddc: ddc:530
MONTE-CARLO GENERATOR, E&E ANNIHILATION, ZEUS; LARGE-RAPIDITY-GAP; CENTRAL TRACKING DETECTOR; ZEUS BARREL CALORIMETER; MONTE-CARLO GENERATOR; E&E ANNIHILATION; GLUON BREMSSTRAHLUNG; HIGH-ENERGIES; 3-JET EVENTS; CONSTRUCTION; MULTIPLICITY, LARGE-RAPIDITY-GAP; CENTRAL TRACKING DETECTOR; ZEUS BARREL CALORIMETER; MONTE-CARLO GENERATOR; E&E ANNIHILATION; GLUON BREMSSTRAHLUNG; HIGH-ENERGIES; 3-JET EVENTS; CONSTRUCTION; MULTIPLICITY, diffraction, FOS: Physical sciences, energy flow, (quark antiquark gluon) [final state], leading particle [p], event shape analysis, 530, High Energy Physics - Experiment, LARGE-RAPIDITY-GAP, High Energy Physics - Experiment (hep-ex), electron p --> p electron (n)hadron, 3-JET EVENTS, dissociation [photon], QC, GLUON BREMSSTRAHLUNG, HIGH-ENERGIES, colliding beams [electron p], multiple production [hadron], resolved [pomeron], Research Groups and Centres\Physics\Low Temperature Physics, radiation [gluon], seagull [effect], CONSTRUCTION, Faculty of Science\Physics, MULTIPLICITY, ZEUS BARREL CALORIMETER, ZEUS, 541, CENTRAL TRACKING DETECTOR, DESY HERA Stor, QC Physics, international, pair production [quark], deep inelastic scattering [electron p], experimental results, ddc: ddc:530
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