Measurement of Trilinear Gauge Couplings in e+e−e^+ e^- Collisions at 161 GeV and 172 GeV

Trilinear gauge boson couplings are measured using data taken by DELPHI at 161~GeV and 172~GeV. Values for $WWV$ couplings ($V=Z, \gamma$) are determined from a study of the reactions \eeWW\ and \eeWev, using differential distributions from the $WW$ final state in which one $W$ decays hadronically and the other leptonically, and total cross-section data from other channels. Limits are also derived on neutral $ZV\gamma$ couplings from an analysis of the reaction \eegi

Search for neutral heavy leptons produced in ZZ decays

Weak isosinglet Neutral Heavy Leptons (νm) have been searched for using data collected by the DELPHI detector corresponding to 3.3 × 106 hadronic Z0 decays at LEP1. Four separate searches have been performed, for short-lived νm production giving monojet or acollinear jet topologies, and for long-lived νm giving detectable secondary vertices or calorimeter clusters. No indication of the existence of these particles has been found, leading to an upper limit for the branching ratio BR(Z0 → νmν̄) of about 1.3 × 10-6 at 95% confidence level for νm masses between 3.5 and 50 GeV/c2. Outside this range the limit weakens rapidly with the νm mass. The results are also interpreted in terms of limits for the single production of excited neutrinos. © Springer-Verlag 1997

Electroweak parameters of the z0 resonance and the standard model

Contains fulltext : 124399.pdf (publisher's version ) (Open Access

THE BARREL RING IMAGING CHERENKOV COUNTER OF DELPHI

A short explanation is given of the Barrel Ring Imaging CHerenkov (BRICH) detector and its performance. We discuss in brief some of the requirements to run this detector. Special attention is paid to the functioning of the Cherenkov photon detector - a photosensitive gas-filled drift chamber where the photoelectrons drift to a MWPC of special construction. We illustrate the BRICH performance with some preliminary results

Recent results from the DELPHI Barrel Ring Imaging Cherenkov counter

International audienc

THE RING IMAGING CHERENKOV DETECTORS OF DELPHI

none98A Ring Imaging Cherenkov (RICH) detector system has been built and is now in full operation within the DELPHI experiment. Large data samples of Z(O) decays are being collected with good resolution on the observed Cherenkov angles. Several studies of Z(O) decays using the RICH have already been performed on limited samples. Disturbance of the detector operation caused by shrinkage of polymeric construction materials and by migration of radiator substance is reported. These effects have been counteracted and do not endanger the quality of the data.W. ADAM;E. ALBERECHT;D. ALLEN;M. ANDRIEUX;G. VANAPELDOORN;Y. ARNOUD;C. AUBRET;A. AUGUSTINUS;P. BAILLON;M. BATTAGLIA;M. BERGGREN;D. BLOCH;O. BOTNER;C. BOURDARIOS;J. BRUNET;A. BUDZIAK;A. BUYS;P. CARECCHIO;P. CARRIE;P. CAVALLI;G. CERUTTI;M. CHEVRY;E. CHRISTOPHEL;E. DAHLJENSEN;G. DAMGAARD;N. DIMITRIOU;B. DALMAGNE;M. DAVENPORT;J. DOLBEAU;M. DRACOS;M. DRIS;T. EKELOF;J. ENGEL;D. FASSOULIOTIS;T. FILIPPAS;E. FOKITIS;F. FONTANELLI;A. FONTENILLE;D. FRAISSARD;H. FURSTENAU;J. GARCIA;E. GAZIS;D. GILLESPIE;V. GRACCO;L. GUGLIELMI;F. HAHN;S. HAIDER;A. HALLGREN;W. HAO;P. HONORE;K. HUET;S. ILIE;P. IOANNOU;P. JUILLOT;E. KARVELAS;S. KATSANEVAS;E. KATSOUFIS;N. KJAER;P. KLUIT;B. KOENE;C. KOURKOUMELIS;G. LECOEUR;G. LENZEN;L. LINDQVIST;A. AGUERA;D. LOUKAS;S. MALTEZOS;A. MARKOU;J. MEDBO;J. MICHALOWSKI;F. MONTANO;G. MOURGUE;B. NIELSEN;R. NICOLAIDOU;T. PAPADOPOULOU;A. PETROLINI;D. POUTOT;G. POLOK;H. RAHMANI;M. REALE;L. RESVANIS;G. SAJOT;M. SANNINO;E. SCHYNS;S. SQUARCIA;P. STASSI;R. STRUB;J. THADOME;G. THEODOSIOU;M. TOBAR;D. TOET;L. TRASPEDINI;G. TRIPODI;G. TRISTRAM;A. TSIROU;O. ULLALAND;A. DELAVEGA;M. ZAVRTANIKW., Adam; E., Alberecht; D., Allen; M., Andrieux; G., Vanapeldoorn; Y., Arnoud; C., Aubret; A., Augustinus; P., Baillon; M., Battaglia; M., Berggren; D., Bloch; O., Botner; C., Bourdarios; J., Brunet; A., Budziak; A., Buys; P., Carecchio; P., Carrie; P., Cavalli; G., Cerutti; M., Chevry; E., Christophel; E., Dahljensen; G., Damgaard; N., Dimitriou; B., Dalmagne; M., Davenport; J., Dolbeau; M., Dracos; M., Dris; T., Ekelof; J., Engel; D., Fassouliotis; T., Filippas; E., Fokitis; Fontanelli, Flavio; A., Fontenille; D., Fraissard; H., Furstenau; J., Garcia; E., Gazis; D., Gillespie; Gracco, Valerio; L., Guglielmi; F., Hahn; S., Haider; A., Hallgren; W., Hao; P., Honore; K., Huet; S., Ilie; P., Ioannou; P., Juillot; E., Karvelas; S., Katsanevas; E., Katsoufis; N., Kjaer; P., Kluit; B., Koene; C., Kourkoumelis; G., Lecoeur; G., Lenzen; L., Lindqvist; A., Aguera; D., Loukas; S., Maltezos; A., Markou; J., Medbo; J., Michalowski; F., Montano; G., Mourgue; B., Nielsen; R., Nicolaidou; T., Papadopoulou; Petrolini, Alessandro; D., Poutot; G., Polok; H., Rahmani; M., Reale; L., Resvanis; G., Sajot; Sannino, Mario; E., Schyns; Squarcia, Sandro; P., Stassi; R., Strub; J., Thadome; G., Theodosiou; M., Tobar; D., Toet; L., Traspedini; G., Tripodi; G., Tristram; A., Tsirou; O., Ullaland; A., Delavega; M., Zavrtani