Theodora Papadopoulou
National Technical University of Athens
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Theodora Papadopoulou.
ieee nuclear science symposium | 1990
E.G. Anassontzis; P. Ioannou; G. Kalkanis; S. Katsanevas; I. Kontaxis; C. Koukoumelis; S. Nounos; P. Preve; L.K. Resvanis; J.M. Brunet; J. Dolbeau; L. Guglielmi; F. Ledroit; D. Poutot; G. Tristram; P. Baillon; M. Barranco-Luque; M. Davenport; S. Delorme; J. Dixon; M. Dracos; D. Fraissard; J.B. Franco; E. Gaumann; B. Goret; F. Hahn; S. Haider; W. Klempt; B. Koene; G. Lecoeur
The DELPHI detector installed in the LEP (Large Electron-Positron Collider) is equipped with RICH (ring imaging Cherenkov) counters. The barrel part incorporates a liquid (C/sub 6/F/sub 14/) and a gaseous (C/sub 5/F/sub 12/) radiator, providing particle identification up to 20 GeV/c. The Cherenkov photons of both radiators are detected by TPC (time projection chamber)-like photon detectors. The drift gas (75% CH/sub 4/+25% C/sub 2/H/sub 6/) is doped with TMAE (tetrakis-dimethylamine-ethylene) by which the ultraviolet Cherenkov photons are converted into single free photoelectrons. These are drifted towards multiwire proportional chambers at the end of the drift tubes, and the space coordinates of the conversion point are determined. One half of the barrel RICH is now equipped with drift tubes and has provided results from the liquid radiator since spring 1990. The gas radiator has been tested with C/sub 2/F/sub 6/ as a preliminary filling since August 1990. The data obtained demonstrate the good particle identification potential. For the liquid radiator, the number of detected photons per ring in hadron jets is N=8, whereas for muon pairs (single tracks) N=10 has been obtained. For the gas radiator, 2.1 photons per track were observed, which demonstrates good functioning of the focussing mirrors. >
Proceedings of the 31st International Conference on High Energy Physics Ichep 2002 | 2003
Theodora Papadopoulou
Abstract An overview of searches from LEP experiments (ALEPH, DELPHI, L3 and OPAL) is presented on pair and single production of supersymmetric particles under the assumption that R-parity is violated via a single dominant coupling using the data collected at LEP2. The observed canditate events in the data are in aggreement with the Standard Model expectation, and limits on the production cross sections and the masses of the supersymmetric particles are derived.
nuclear science symposium and medical imaging conference | 1994
G. von Apeldoorn; Y. Arnoud; C. Aubret; P. Baillon; M. Battaglia; M. Berggren; D. Bloch; C. Bourdarios; J.M. Brunet; A. Buys; P. Carrié; M. Chevry; E. Christophel; B. D'Almagne; Martyn Davenport; J. Dolbeau; M. Dracos; M. Dris; J.P. Engel; D. Fassouliotis; T.A. Filippas; E. Fokitis; D. Fraissard; F. Fulda; E. N. Gazis; L. Guglielmi; F. Hahn; S. Haider; P.F. Honore; Kathy Huet
The Barrel Ring Imaging Cherenkov detector of the DELPHI experiment at LEP provides particle identification by the detection of the radiation emitted in UV transparent perfluorocarbons. We will present the principles of the operation of the detector together with a discussion of the automatized control of all the relevant physical parameters. The observed performances of the detector are very close to their design values. >
Collaboration
Dive into the Theodora Papadopoulou's collaboration.
