O. Gildemeister
CERN
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Featured researches published by O. Gildemeister.
Physics Letters B | 1983
M. Banner; W. Zeller; Franco Bonaudi; M. Borghini; R. Mollerud; F. Pastore; P. H. Hansen; V. Vercesi; J.M. Gaillard; B. Mansoulie; B.S. Nilsson; G Parrour; J. Teiger; V. Hungerbühler; H.M. Steiner; K. Borer; M. Livan; G. Sauvage; P. Mani; P. Jenni; P.-A. Dorsaz; V.G. Goggi; G. Stimpfl; T. Himel; J.C. Chollet; A. Rothenberg; J.L. Siegrist; C. Onions; S. Loucatos; B. Madsen
Abstract We report the results of a search for single isolated electrons of high transverse momentum at the CERN p p collider. Above 15 GeV/c, four events are found having large missing transverse energy along a direction opposite in azimuth to that of the high-pT electron. Both the configuration of the events and their number are consistent with the expectations from the process p + p → W ± + anything , with W→e+ν, where W± is the charged Intermediate Vector Boso postulated by the unified electroweak theory.
Physics Letters B | 1983
P. Bagnaia; M. Banner; R. Battiston; Ph. Bloch; Franco Bonaudi; K. Borer; M. Borghini; J.C. Chollet; A.G. Clark; C. Conta; P. Darriulat; L. Di Lella; J. Dines-Hansen; P.-A. Dorsaz; L. Fayard; M. Fraternali; Daniel Froidevaux; G. Fumagalli; J.M. Gaillard; O. Gildemeister; V.G. Goggi; H. Grote; B. Hahn; H. Hänni; John Renner Hansen; P. H. Hansen; T. Himel; V. Hungerbühler; P. Jenni; O. Kofoed-Hansen
Abstract From a search for electron pairs produced in p p collisions at s = 550 GeV we report the observation of eight events which we interpret as resulting from the process p +p→Z 0 + anything, followed by the decay Z0→e++e− or Z0→e++e−+γ, where Z0 is the neutral Intermediate Vector Boson postulated by the unified electroweak theory. We use four of these events to measure the Z0 mass M Z = 91.9 ± 1.3 ± 1.4 (systematic) GeV /c 2 .
Physics Letters B | 1982
M. Banner; Ph. Bloch; Franco Bonaudi; K. Borer; M. Borghini; J.C. Chollet; A.G. Clark; C. Conta; P. Darriulat; L. Di Lella; J. Dines-Hansen; P.-A. Dorsaz; L. Fayard; M. Fraternali; Daniel Froidevaux; J.M. Gaillard; O. Gildemeister; V.G. Goggi; W. Zeller
The distribution of total tranverse energy ΣET over the pseudorapidity interval −1 < η < 1 and an azimuthal range Δφ=300° has been measured in the UA2 experiment at the CERN pp collider (s = 540 GeV) using a highly segmented total absorption caloriter. In the events with very large ΣET (ΣET⪆60 GeV) most of the transverse energy is found to be contained in small angular regions as expected for high transverse momentum hadron jets. We discuss the properties of a sample of two-jet events with invariant two-jet masses up to 140 GeVc2 and we measure the cross section for inclusive jet production in the range of jet transverse momenta between 15 and 60 GeVc.
Nuclear Instruments and Methods in Physics Research | 1984
A. Beer; Franco Bonaudi; L. Bonnefoy; M. Borghini; F. Bourgeois; A.G. Clark; J.-M. Chapuis; Y. Cholley; A. Corre; G. Critin; P. Darriulat; L. Di Lella; P.-A. Dorsaz; O. Gildemeister; G. Gurrieri; John Renner Hansen; T. Himel; V. Hungerbühler; P. Jenni; L. Mapelli; J.-P. Marcelin; H. Pflumm; J. Ringel; A. Rothenberg; G. Schuler; J.L. Siegrist; A. Sigrist; P. Wicht; K. Zankel
Abstract The highly segmented electromagnetic and hadronic calorimeter of the UA2 experiment has been successfully operated at the CERN p p Collider for more than 3 years. The mechanical design and construction technique of the calorimeter as well as its performance and stability in test beams and at the p p Collider are described in detail.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1990
D. Acosta; S. Buontempo; L. P. Caloba; M. Caria; R. DeSalvo; A. Ereditato; Roberto Ferrari; M. Fraternali; G. Fumagalli; O. Gildemeister; F. Hartjes; Th.H. Henkes; A. Henriques; L. Linssen; M. Livan; A. Maio; L. Mapelli; K.H. Meier; B. Ong; H. P. Paar; F. Pastore; M. Pereira; L. Poggioli; C.V. Scheel; J. M. Seixas; A. Simon; M. Sivertz; P. Sonderegger; M.N. Souza; Z.D. Thomé
In the framework of the LAA project, prototypes for a new type of calorimeter, intended for the detection of both electromagnetic (e.m.) and hadronic showers, muons and missing energy (e.g. neutrinos) at high-luminosity multi-TeV pp colliders, were tested. The detector consists of scintillating plastic fibres embedded in a lead matrix at a volume ratio 1:4, such as to achieve compensation. The optimization of the construction of the detector modules is described, as well as the performance concerning e.m. shower and muon detection and e/π separation. We used electron, pion and muon beams in the energy range 10–150 GeV for this purpose. For the energy resolution of electrons we found 13%/trE, with a constant term of 1%. The signal uniformity was better than 3% over the total surface of projective modules. The signal linearity for e.m. shower detection was better than 1%, and the e/π separation was better than 5 × 10−4 for isolated particles. Channeling effects are negligible, provided that the angle between the incoming particles and the fibre axis is larger than 2°.
Physics Letters B | 1984
P. Bagnaia; W. Zeller; M. Borghini; R. Mollerud; F. Pastore; P. Hansen; V. Vercesi; J.M. Gaillard; B. Mansoulie; J. Bürger; J. Teiger; C. Gössling; K. Borer; R. Engelmann; H. Zaccone; G. Sauvage; P. Mani; P. Jenni; V.G. Goggi; G. Stimpfl; Janusz Andrzej Zakrzewski; T. Himel; J.C. Chollet; A. Rothenberg; J.L. Siegrist; M Livan; C. Onions; S. Loucatos; B. Madsen; P. Bloch
Abstract Using a sample of events collected by UA2 and corresponding to an integrated luminosity of 116 nb −1 . we have searched for electron-“neutrino” pairs in which the transverse momenta of the electron and of the “neutrino” exceed 15 GeV/c and 25 GeV/c respectively. A total of 35 events are observed in low background conditions. Most events can be interpreted in terms of W ± production from QCD processes. Events in which the observation of hard jets makes this interpretation unlikely are described in detail. Possible sources of background contamination are considered.
Physics Letters B | 1987
R. Ansari; P. Bagnaia; M. Banner; R. Battiston; K. Bernlöhr; C.N. Booth; K. Borer; M. Borghini; G. Carboni; V. Cavasinni; P. Cenci; J.C. Chollet; A.G. Clark; C. Conta; F. Costantini; Pierre Darriulat; B. De Lotto; T. Del Prete; L. Di Lella; J. Dines-Hansen; K. Einsweiler; L. Fayard; Roberto Ferrari; M. Fraternali; D. Froidevaux; J.M. Gaillard; O. Gildemeister; V.G. Goggi; C. Gössling; B. Hahn
Abstract A study has been made of the decays W → ev and Z → e + e − , using the UA2 detector at the CERN pp Collider. The data correspond to an integrated luminosity of 142 nb −1 at a centre-of-mass collision energy √ s =546 GeV, and 768 nb −1 at √ s =630 GeV. Measurements of the standard model parameters from samples of 251 W decay and 39 Z decay candidates are compared with expectations of the standard electroweak model.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1994
F. Ariztizabal; M. Bosman; M. Cavalli-Sforza; I. Efthymiopoulos; C. Padilla; F. Teubert; R. Arsenescu; C. Blag; V. Boldea; S. Dita; Z. Ajaltouni; F. Badaud; N. Bouhemaid; P. Brette; M. Brossard; R. Chadelas; J.C. Chevaleyre; M. Crouau; F. Daudon; J.J. Dugne; B. Michel; G. Montarou; G.-S. Muanza; D. Pallin; S. Poirot; Louis-Pierre Says; F. Vazeille; O. Gildemeister; A. Henriques; J. Ivarsson
Abstract The first prototype of a scintillator tile hadron calorimeter with longitudinal tile orientation and wavelength shifting fiber readout has been built and tested with pion, electron and muon beams at the CERN SPS. This innovative geometry combines good performance and a simple and cost effective assembly procedure. Calibration and monitoring of this detector have also been investigated.
Physics Letters B | 1985
J. A. Appel; M. Banner; E. Lançon; S. Loucatos; B. Mansoulie; M. Polverel; A. Roussarie; V. Ruhlmann; J. Teiger; H. Zaccone; P. Bagnaia; M. Borghini; A.G. Clark; P. Darriulat; L. Di Lella; K. Einsweiler; R. Engelmann; O. Gildemeister; C. Goessling; John Renner Hansen; P. Hansen; N. Harnew; T. Himel; P. Jenni; L. Mapelli; K. Meier; C. Onions; A. Rothenberg; M. Swartz; S.N. Tovey
Abstract The production of very large transverse momentum ( p T ) hadron jets has been measured in the UA2 experiment at the CERN p p Collider for s =630 GeV . The inclusive jet production cross sections exhibit a p T -dependent increase with respect to the s =546 GeV data from previous Collider runs. This increase can be described both by QCD calculations and by approximate x T =2 p T /√ s scaling. No significant deviation of the data from QCD predictions is observed at very large p T , placing a lower limit on the characteristic scale Λ c of a hypothetical superstrong contact interaction responsible for the binding of preons in the quark ( Λ c >370 GeV at 95% CL).
Physics Letters B | 1983
M. Banner; W. Zeller; Franco Bonaudi; M. Borghini; P.-A. Dorsaz; R. Mollerud; F. Pastore; P. H. Hansen; A.G. Clark; M. Fraternali; B. Mansoulie; John Renner Hansen; J. Teiger; V. Hungerbühler; K. Borer; B. Hahn; M. Livan; G. Sauvage; P. Jenni; M. Mermikides; T. Himel; O. Kofoed Hansen; G. Mantovani; A. Rothenberg; V.G. Goggi; S. Loucatos; B. Madsen; P. Bloch; A. Zylberstejn; A. Roussarie
Transverse momentum distributions of pions, kaons and protons have been measured around 90° in the UA2 detector at the SPS p p collider, at a CM energy of 540 GeV. All the cross sections have increased by more than a factor of 2 over those measured at ISR energies and exhibit a flatter behaviour with respect to transverse momentum.