The ZEUS Forward Plug Calorimeter with Lead-Scintillator Plates and WLS Fiber Readout

Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany; Fakultät für Physik, Universität Freiburg, Freiburg, Germany a; Institute of Exp. Physics, Hamburg University, Hamburg, I, Germany; Institute of Particle and Nuclear Studies, KEK, Tsukuba, Japan; Kyungpook National University, Taegu; Dept. of Physics, Pennsylvania State University, PA, USA d; School of Physics, Tel-Aviv University, Tel Aviv, Israel e; Dept. of Physics, Tokyo Metropolitan University, Tokyo, Japan; Department of Physics, University of Tokyo, Tokyo, Japan
12/1999; DOI: 10.1016/S0168-9002(00)00274-6
Source: arXiv

ABSTRACT A Forward Plug Calorimeter (FPC) for the ZEUS detector at HERA has been built as a shashlik lead-scintillator calorimeter with wave length shifter fiber readout. Before installation it was tested and calibrated using the X5 test beam facility of the SPS accelerator at CERN. Electron, muon and pion beams in the momentum range of 10 to 100 GeV/c were used. Results of these measurements are presented as well as a calibration monitoring system based on a $^{60}$Co source. Comment: 38 pages (Latex); 26 figures (ps)

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    ABSTRACT: The cross sections for deeply virtual Compton scattering in the reaction ep® e¢gp¢ep\to e'\gamma p' has been measured with the ZEUS detector at HERA using integrated luminosities of 95 pb-1 of e + p and 17 pb-1 of e - p collisions. Cross sections are presented as a function of the exchanged photon virtality, Q 2, and the centre-of-mass energy, W, of the g*p\gamma^*p system in the region 5 < Q2 < 100 \textGeV25 < Q^2 < 100 \text{GeV}^2 and 40 < W < 140 \textGeV40 < W < 140 \text{GeV} . The obtained results are compared to QCD-based calculations.
    European Physical Journal C 01/2005; · 5.25 Impact Factor
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    ABSTRACT: Diffractive photoproduction of D*+/-(2010) mesons was measured with the ZEUS detector at the ep collider HERA, using an integrated luminosity of 78.6 pb^{-1}. The D* mesons were reconstructed in the kinematic range: transverse momentum p_T(D*) > 1.9 GeV and pseudorapidity |eta(D*)| < 1.6, using the decay D*+ -> D0 pi+_s followed by D0 -> K- pi+ (+c.c.). Diffractive events were identified by a large gap in pseudorapidity between the produced hadronic state and the outgoing proton. Cross sections are reported for photon-proton centre-of-mass energies in the range 130 < W < 300 GeV and for photon virtualities Q^2 < 1 GeV^2, in two ranges of the Pomeron fractional momentum x_pom < 0.035 and x_pom < 0.01. The relative contribution of diffractive events to the inclusive D*+/-(2010) photoproduction cross section is about 6%. The data are in agreement with perturbative QCD calculations based on various parameterisations of diffractive parton distribution functions. The results are consistent with diffractive QCD factorisation.
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    ABSTRACT: The production of dijets in diffractive deep inelastic scattering has been measured with the ZEUS detector at HERA using an integrated luminosity of $61 \pbi$. The dijet cross section has been measured for virtualities of the exchanged virtual photon, $5 < Q^2 < 100 \gev^2$, and $\gamma^{*} p$ centre-of-mass energies, 100 < W < 250 GeV. The jets, identified using the inclusive k_{T} algorithm in the $\gamma^* p$ frame, were required to have a transverse energy $E^*_{T, \rm jet} > 4 \gev$ and the jet with the highest transverse energy was required to have $E^*_{T,\rm jet} > 5 \gev$. All jets were required to be in the pseudorapidity range $-3.5 < \eta^*_{\rm jet} < 0$. The differential cross sections are compared to leading-order predictions and next-to-leading-order QCD calculations based on recent diffractive parton densities extracted from inclusive diffractive deep inelastic scattering data.

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