29 research outputs found
THE K0/PI- RATIO AND STRANGENESS SUPPRESSION IN NU-P AND NUBARP CHARGED CURRENT INTERACTIONS
POLARIZATION OF LAMBDA-HYPERONS PRODUCED INCLUSIVELY IN NU-P AND NU-BAR-P CHARGED CURRENT INTERACTIONS
PRODUCTION OF PI-0 MESONS AND CHARGED HADRONS IN NU-BAR-NEON AND NU-NEON CHARGED CURRENT INTERACTIONS
PRODUCTION OF RHO+,-,0(770), ETA(550), OMEGA(783) AND F2(1270) MESONS IN VBAR NEON AND V-NEON CHARGED CURRENT INTERACTIONS
COHERENT PRODUCTION OF RHO- MESONS IN CHARGED CURRENT ANTINEUTRINO-NEON INTERACTIONS IN BEBC
MEASUREMENT OF TOTAL AND PARTIAL PHOTON PROTON CROSS-SECTIONS AT 180 GEV CENTER-OF-MASS ENERGY RID C-1693-2008 RID B-9165-2008 RID C-5889-2009 RID A-4818-2008
Photon proton cross sections for elastic light vector meson production, sigma(el)gammap, inelastic diffractive production, sigma(d)gammap, non-diffractive production, sigma(nd)gammap, as well as the total cross section, sigma(tot)gammap, have been measured at an average gammap center of mass energy of 180 GeV with the ZEUS detector at HERA. The resulting values are sigma(el)gammap = 18 +/- 7 mub, sigma(d)gammap = 33 +/- 8 mub, sigma(nd)gammap = 91 +/- 11 mub, and sigma(tot)gammap = 143 +/- 17 mub, where the errors include statistical and systematic errors added in quadrature
HADRONIC ENERGY-DISTRIBUTIONS IN DEEP-INELASTIC ELECTRON-PROTON SCATTERING
This paper presents energy distributions of the hadronic system produced in neutral-current electron-proton deep-inelastic scattering at a centre of mass energy of 296 GeV. Comparison of the results with QCD Monte Carlo models shows that QCD radiation has a strong influence on the characteristics of the final state. The data are reasonably reproduced by the Lund model based on a matrix element calculation in first order of alpha(s), followed by appropriate parton showers, as well as by the colour dipole model. The HERWIG parton shower model also gives a reasonable representation of the data. Neither the first order matrix elements alone nor the Lund parton shower model, without the matrix element calculation, reproduce the data
Observation of two jet production in deep inelastic scattering at HERA
A sample of events with two distinct jets, in addition to the proton remnant, has been identified in deep inelastic, neutral current ep interactions recorded at HERA by the ZEUS experiment. For these events, the mass of the hadronic system ranges from 40 to 260 GeV. The salient features of the observed jet production agree with the predictions of higher order QCD