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Featured researches published by G. Cases.


Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1991

Construction and beam test of the ZEUS forward and rear calorimeter

A. Andresen; A. Bamberger; J. Hartmann; W. Vogel; U. Holm; E. Hilger; U. Kötz; G. Drews; R. Hamatsu; J. K. Mayer; H. Uijterwaal; J.F. Martin; D. Schäcke; J. Krüger; D. J. Gilkinson; S. Ritz; T. A. Romanowski; S. Yamada; G. Cases; M. Brkic; R. Klanner; U. Behrens; T. Tsurugai; L. Hagge; H. Kammerlocher; A. Bargende; F. Barreiro; C. Youngman; J. Dawson; G. G. Stairs

Abstract The forward and rear calorimeters of the ZEUS experiment are made of 48 modules with maximum active dimensions of 4.6 m height, 0.2 m width, 7 λ depth and maximum weight of 12 t. It consists of 1 X 0 uranium plates interleaved with plastic scintillator tiles read out via wavelength shifters and photomultipliers. The mechanical construction, the achieved tolerances as well as the optical and electronics readout are described. Ten of these modules have been tested with electrons, hadrons and muons in the momentum range 15–100 GeV/ c . Results on resolution, uniformity and calibration are presented. Our main result is the achieved calibration accuracy of about 1% obtained by using the signal from the uranium radioactivity.


European Physical Journal A | 1990

Global jet properties at 14–44 GeV center of mass energy ine+e− annihilation

W. Braunschweig; R. Gerhards; F. J. Kirschfink; H.-U. Martyn; H. M. Fischer; H. Hartmann; J. Hartmann; E. Hilger; A. Jocksch; R. Wedemeyer; B. Foster; A. J. Martin; E. Bernardi; J. J. Chwastowski; A. Eskreys; K. Genser; H. Hultschig; P. Joos; H. Kowalski; A. Ladage; B. Löhr; D. Lüke; P. Mättig; D. Notz; J. M. Pawlak; K. U. Pösnecker; E. Ros; D. Trines; R. Walczak; G. Wolf

AbstractJet properties ine+e− annihilation at center of mass energies of 14, 22, 35 and 43.7 GeV were studied with the data collected in the TASSO detector at PETRA, using the same evaluation procedures for all the energies. The total hadronic cross section ratio for the center of mass energy interval 39–47 GeV was determined to be ℛ=4.11±0.05 (stat)±0.18(syst.) at


European Physical Journal C | 1990

Strange meson production ine+e− annihilation

W. Braunschweig; R. Gerhards; F. J. Kirschfink; H.-U. Martyn; H. M. Fischer; H. Hartmann; J. Hartmann; E. Hilger; A. Jocksch; R. Wedemeyer; B. Foster; A. J. Martin; F. Barreiro; E. Bernardi; J. J. Chwastowski; A. Eskreys; K. Gather; K. Genser; H. Hultschig; P. Joos; H. Kowalski; A. Ladage; B. Löhr; D. Lüke; P. Mättig; D. Notz; J. M. Pawlak; K. U. Pösnecker; E. Ros; D. Trines


Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1990

Measurements of longitudinal and transverse profiles for hadron showers in the range 10–100 GeV and comparisons with Monte Carlo simulations

F. Barreiro; G. Cases; P. Cloth; K. Dierks; G. Drews; J. Engelen; D. Filges; M.A. Garcia; R. Klanner; U. Kötz; J. Krüger; G. M. Levman; J. F. Martin; H.-J. Möhring; F. Selonke; G. Sterzenbach; J. Straver; H. Tiecke; T. Tymieniecka

\langle \sqrt s \rangle = 43 - 7


Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1994

Calibration of the forward and rear ZEUS calorimeter using cosmic ray muons

U. Behrens; G. Cases; A. Freidhof; A. Fürtjes; J. W. Mitchell; K. Molthagen; B. Surrow; T. Tsurugai; R. Yoshida


European Physical Journal C | 1990

Experimental study of the orientation of three-jet events ine+e− annihilation at PETRA

W. Braunschweig; R. Gerhards; F. J. Kirschfink; H.-U. Martyn; H. M. Fischer; H. Hartmann; J. Hartmann; E. Hilger; A. Jocksch; R. Wedemeyer; B. Foster; A. J. Martin; F. Barreiro; E. Bernardi; J. J. Chwastowski; A. Eskreys; K. Gather; K. Genser; H. Hultschig; P. Joos; J. G. Körner; H. Kowalski; A. Ladage; B. Löhr; D. Lüke; P. Mättig; D. Notz; J. M. Pawlak; K. U. Pösnecker; E. Ros

GeV. Corrected distributions of global shape variables are presented as well as the inclusive charged particle distributions for scaled momentum and transverse momentum. The center of mass energy evolution of the average sphericity, thrust, aplanarity and particle momentum is shown.


European Physical Journal C | 1990

Measurement of the asymmetry ofb quark production ine+e− annihilation at\(\sqrt s = 35 GeV\)

W. Braunschweig; R. Gerhards; F. J. Kirschfink; H.-U. Martyn; H. M. Fischer; H. Hartmann; J. Hartmann; E. Hilger; A. Jocksch; R. Wedemeyer; B. Foster; A. J. Martin; E. Bernardi; J. J. Chwastowski; A. Eskreys; K. Genser; H. Hultschig; P. Joos; H. Kowalski; A. Ladage; B. Löhr; D. Lüke; P. Mättig; D. Notz; J. M. Pawlak; K. U. Pösnecker; E. Ros; D. Trines; R. Walczak; G. Wolf

AbstractThe full TASSO data have been used to study the inclusive production of strange mesons ine+e− annihilations. Differential and total cross sections have been measured in the centre of mass energy range 14 to 44 GeV forK0,


European Physical Journal C | 1990

Experimental study of the orientation of three-jet events in e + e -

W. Braunschweig; R. Gerhards; F. J. Kirschfink; H.-U. Martyn; H. M. Fischer; H. Hartmann; J. Hartmann; E. Hilger; A. Jocksch; R. Wedemeyer; B. Foster; Andre Martin; F. Barreiro; E. Bernardi; J. J. Chwastowski; A. Eskreys; K. Gather; K. Genser; H. Hultschig; P. Joos; J. G. Körner; H. Kowalski; A. Ladage; B. Löhr; D. Lüke; P. Mättig; Dieter Notz; J. M. Pawlak; K. U. Pösnecker; E. Ros


European Physical Journal C | 1990

Measurement of the asymmetry of b quark production in e + e -

W. Braunschweig; R. Gerhards; F. J. Kirschfink; H.-U. Martyn; Hans Fischer; H. Hartmann; J. Hartmann; E. Hilger; A. Jocksch; R. Wedemeyer; B. Foster; Alain J. Martin; E. Bernardi; J. J. Chwastowski; A. Eskreys; K. Genser; H. Hultschig; P. Joos; H. Kowalski; A. Ladage; B. Löhr; D. Lüke; P. Mättig; Dieter Notz; J. M. Pawlak; K. U. Pösnecker; E. Ros; D. Trines; R. Walczak; G. Wolf

\bar K^0


European Physical Journal C | 1990

Global jet properties at 1444 GeV center of mass energy in e + e -

W. Braunschweig; R. Gerhards; F. J. Kirschfink; H.-U. Martyn; H. M. Fischer; H. Hartmann; J. Hartmann; E. Hilger; A. Jocksch; R. Wedemeyer; B. Foster; Andre Martin; E. Bernardi; J. J. Chwastowski; A. Eskreys; K. Genser; H. Hultschig; P. Joos; H. Kowalski; A. Ladage; B. Löhr; D. Lüke; P. Mättig; Dieter Notz; J. M. Pawlak; K. U. Pösnecker; E. Ros; D. Trines; R. Walczak; G. Wolf

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B. Foster

University of Hamburg

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R. Gerhards

RWTH Aachen University

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