Operational experience with the 4π ring imaging Cherenkov detector of DELPHI

none104The ring imaging Cherenkov detector in the DELPHI Experiment at LEP allows hadron identification over a momentum range up to about 40 Gev/c over a near to 4 pi solid angle. Photons emitted by charged particles traversing gas and liquid radiators which are filled with UV-transparent perfluorocarbons, are used for Cherenkov angle reconstruction. Stable operation ensures that the detector is an efficient and powerful instrument. Monitoring of the detector parameters is of utmost importance to achieve good data quality and adequate data processing. The hadron identifying power of the ring imaging Cherenkov detector closely meets the main design values. Computerized control and monitoring features of the different subsystems will be presented. The interplay between detector parameters and the particle separating capacity of the detector will be discussed.W. ADAM;E. ALBRECHT;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. GERUTTI;M. CHEVRY;E. CHRISTOPHEL;E. DAHLJENSEN;G. DAMGAARD;N. DIMITRIOU;B. DALMAGNE;M. DAVENPORT;J. DOLBEAU;M. DRACOS;M. DRIS;L. EEK;T. EKELOF;J. ENGEL;D. FASSOULIOTIS;T. FILIPPAS;E. FOKITIS;F. FONTANELLI;A. FONTENILLE;D. FRAISSARD;F. FULDA;H. FURSTENAU;J. GARCIA;E. GAZIS;D. GILLESPIE;V. GRACCO;L. GUGLIELMI;F. HAHN;S. HAIDER;A. HALLGREN;W. HAO;T. HENKES;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;A. MALTEZOS;S. MALTEZOS;A. MARKOU;J. MEDBO;J. MICHALOWSKI;F. MONTANO;G. MOURGUE;B. NIELSEN;R. NICOLAIDOU;J. OSTLER;T. PAPADOPOULOU;A. PETROLINI;G. POLOK;D. POUTOT;H. RAHMANI;M. REALE;L. RESVANIS;G. SAJOT;M. SANNINO;E. SARAGAS;E. SCHYNS;S. SQUARCIA;P. STASSI;R. STRUB;J. THADOME;G. THEODOSIOU;D. TOET;L. TRASPEDINI;G. TRIPODI;G. TRISTRAM;A. TSIROU;O. ULLALAND;A. DELAVEGA;M. ZAVRTANIK;E. ZEVGOLATAKOSW., Adam; E., Albrecht; 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., Gerutti; M., Chevry; E., Christophel; E., Dahljensen; G., Damgaard; N., Dimitriou; B., Dalmagne; M., Davenport; J., Dolbeau; M., Dracos; M., Dris; L., Eek; T., Ekelof; J., Engel; D., Fassouliotis; T., Filippas; E., Fokitis; Fontanelli, Flavio; A., Fontenille; D., Fraissard; F., Fulda; H., Furstenau; J., Garcia; E., Gazis; D., Gillespie; Gracco, Valerio; L., Guglielmi; F., Hahn; S., Haider; A., Hallgren; W., Hao; T., Henkes; 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; A., Maltezos; S., Maltezos; A., Markou; J., Medbo; J., Michalowski; F., Montano; G., Mourgue; B., Nielsen; R., Nicolaidou; J., Ostler; T., Papadopoulou; Petrolini, Alessandro; G., Polok; D., Poutot; H., Rahmani; M., Reale; L., Resvanis; G., Sajot; Sannino, Mario; E., Saragas; E., Schyns; Squarcia, Sandro; P., Stassi; R., Strub; J., Thadome; G., Theodosiou; D., Toet; L., Traspedini; G., Tripodi; G., Tristram; A., Tsirou; O., Ullaland; A., Delavega; M., Zavrtanik; E., Zevgolatako

Charged Kaon Production in Tau Decays at LEP

Kaon production in one prong tau decays has been studied using data collected with the DELPHI detector at the LEP collider Charged kaons were identified over a large momentum range by the DELPHI barrel Ring Imaging Cherenkov detector. The following branching ratios have been determined: BR(τ → Kντ) = (0.85 ± 0.18) %, BR(τ → Kντ ≥ 0 neutrals) = (1.54 ± 0.24)%, BR(τ → Kντ ≥ 1 neutrals) = (0.69 ± 0.25)%. The result for the exclusive branching ratio is consistent with the Standard Model prediction based on τ - μ - e universality. In addition, tau decay into K*- was studied in the channel K*- → K-π0. The result BR(τ → K*-ντ) x BR(K*- → K-w0) = (0.57 ± 0.23)% was obtained.0SCOPUS: ar.jSCOPUS: ar.jinfo:eu-repo/semantics/publishe