A Search for sleptons and gauginos in Z0 decays

Using a data sample corresponding to 10 000 hadronic Z0 decays, we have searched for the production of sleptons and gauginos in the two-prong decays of Z0. No candidate remains after straightforward selections. For neutralinos, we use selection methods developed in our previous search for neutral Higgs particles. The negative results are translated into improved mass limits and parameter constraints on the minimal supersymmetric extension of the standard model

Charged particle multiplicity distributions in Z0 hadronic decays

This paper presents an analysis of the multiplicity distributions of charged particles produced in Z0 hadronic decays in the DELPHI detector. It is based on a sample of 25364 events. The average multiplicity is <nch>=20.71±0.04(stat)±0.77(syst) and the dispersion D=6.28±0.03(stat)±0.43(syst). The data are compared with the results at lower energies and with the predictions of phenomenological models. The Lund parton shower model describes the data reasonably well. The multiplicity distributions show approximate KNO-scaling. They also show positive forward-backward correlations that are strongest in the central region of rapidity and for particles of opposite charge. © 1991 Springer-Verlag

Search for scalar quarks in Z0 decays

A search has been made for pairs of scalar quarks (squarks) produced in e+e- annihilations at LEP (√s≃MZ0), and decaying into a standard quark and a neutral, non-interacting, stable, massive particle (the lightest supersymmetric particle, LSP). The search has been conducted for differences in the mass of the squark and LSP of 2 GeV/c2 and above. Up squarks with masses below 42 GeV/c2 and down squarks below 43 GeV/c2 were excluded. Six squark flavours degenerate in mass were excluded below 45 GeV/c2.0SCOPUS: ar.jinfo:eu-repo/semantics/publishe

SEARCH FOR THE t AND b-prime QUARKS IN HADRONIC DECAYS OF THE Z0 BOSON

We present a search for the third generation up type quark t and a possible fourth down type quark b' in hadronic Z0 decays observed in DELPHI at the LEP collider. For any scenario with a decay through the charged current or into a charged Higgs with a mass at least 6 GeV/c2 below the t and 3 GeVc2 below the b' mass, we set a lower limit for the t quark mass at 44.0 GeV/c2 and for the b' mass at 44.5 GeV/c2. For specific scenarios the mass limits are slightly higher, e.g. for charged current decays the limits are 44.5 and 45.0 GeV/c2 respectively, where all limits are given at a 95% confidence level. © 1990.0SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Search for pair production of neutral Higgs bosons in Z0^0 decays

none486P. Abreu;W. Adam;F. Adami;T. Adye;G.D. Alekseev;J.V. Allaby;P. Allen;S. Almehed;F. Alted;S.J. Alvsvaag;U. Amaldi;E. Anassontzis;W.D. Apel;B. Asman;C. Astor Ferreres;J.E. Augustin;A. Augustinus;P. Baillon;P. Bambade;F. Barao;G. Barbiellini;D.Yu. Bardin;A. Baroncelli;O. Barring;W. Bartl;M.J. Bates;M. Baubillier;K.H. Becks;C.J. Beeston;P. Beilliere;I. Belokopytov;P. Beltran;D. Benedic;J.M. Benlloch;M. Berggren;D. Bertrand;S. Biagi;F. Bianchi;J.H. Bibby;M.S. Bilenky;P. Billoir;J. Bjarne;D. Bloch;P.N. Bogolubov;D. Bollini;T. Bolognese;M. Bonapart;P.S.L. Booth;M. Boratav;P. Borgeaud;H. Borner;C. Bosio;O. Botner;B. Bouquet;M. Bozzo;S. Braibant;P. Branchini;K.D. Brand;R.A. Brenner;C. Bricman;R.C.A. Brown;N. Brummer;J.M. Brunet;L. Bugge;T. Buran;H. Burmeister;C.M. Buttar;J.A.M.A. Buytaert;M. Caccia;M. Calvi;A.J. Camacho Rozas;J.E. Campagne;A. Campion;T. Camporesi;V. Canale;F. Cao;L. Carroll;C. Caso;E. Castelli;M.V. Castillo Gimenez;A. Cattai;F.R. Cavallo;L. Cerrito;P. Charpentier;P. Checchia;G.A. Chelkov;L. Chevalier;P.V. Chliapnikov;V. Chorowicz;R. Cirio;M.P. Clara;J.L. Contreras;R. Contri;G. Cosme;F. Couchot;H.B. Crawley;D. Crennell;M. Cresti;G. Crosetti;N. Crosland;M. Crozon;J. Cuevas Maestro;S. Czellar;S. Dagoret;E. Dahl-Jensen;B. D'Almagne;M. Dam;G. Damgaard;G. Darbo;E. Daubie;M. Davenport;P. David;A. De Angelis;M. De Beer;H. De Boeck;W. De Boer;C. De Clercq;M.D.M. De Fez Laso;N. De Groot;C. De La Vaissiere;B. De Lotto;C. Defoix;D. Delikaris;P. Delpierre;N. Demaria;A. De Min;L. Di Ciaccio;A.N. Diddens;H. Dijkstra;F. Djama;J. Dolbeau;K. Doroba;M. Dracos;J. Drees;M. Dris;W. Dulinski;R. Dzhelyadin;D.N. Edwards;L.O. Eek;P.A.M. Eerola;T. Ekelof;G. Ekspong;J.P. Engel;V. Falaleev;A. Fenyuk;M. Fernandez Alonso;A. Ferrer;S. Ferroni;T.A. Filippas;A. Firestone;H. Foeth;E. Fokitis;F. Fontanelli;H. Forsbach;B. Franek;K.E. Fransson;P. Frenkiel;D.C. Fries;R. Fruhwirth;F. Fulda-Quenzer;H. Fuerstenau;J. Fuster;J.M. Gago;G. Galeazzi;D. Gamba;U. Gasparini;P. Gavillet;S. Gawne;E.N. Gazis;P. Giacomelli;K.W. Glitza;R. Gokieli;V.M. Golovatyuk;A. Goobar;G. Gopal;M. Gorski;V. Gracco;A. Grant;F. Grard;E. Graziani;M.H. Gros;G. Grosdidier;B. Grossetete;S. Gumenyuk;J. Guy;F. Hahn;M. Hahn;S. Haider;Z. Hajduk;A. Hakansson;A. Hallgren;K. Hamacher;G. Hamel De Monchenault;J.F. Harris;B. Heck;I. Herbst;J.J. Hernandez;P. Herquet;H. Herr;E. Higon;H.J. Hilke;T. Hofmokl;R. Holmes;S.O. Holmgren;J.E. Hooper;M. Houlden;J. Hrubec;P.O. Hulth;K. Hultqvist;D. Husson;B.D. Hyams;P. Ioannou;P.S. Iversen;J.N. Jackson;P. Jalocha;G. Jarlskog;P. Jarry;B. Jean-Marie;E.K. Johansson;M. Jonker;L. Jonsson;P. Juillot;R.B. Kadyrov;G. Kalkanis;G. Kalmus;G. Kantardjian;F. Kapusta;P. Kapusta;S. Katsanevas;E.C. Katsoufis;R. Keranen;J. Kesteman;B.A. Khomenko;B. King;N.J. Kjaer;H. Klein;W. Klempt;A. Klovning;P. Kluit;J.H. Koehne;B. Koene;P. Kokkinias;M. Kopf;M. Koratzinos;K. Korcyl;A.V. Korytov;B. Korzen;C. Kourkoumelis;T. Kreuzberger;J. Krolikowski;U. Kruener-Marquis;W. Krupinski;W. Kucewicz;K. Kurvinen;M.I. Laakso;C. Lambropoulos;J.W. Lamsa;L. Lanceri;V. Lapin;J.P. Laugier;R. Lauhakangas;P. Laurikainen;G. Leder;F. Ledroit;J. Lemonne;G. Lenzen;V. Lepeltier;A. Letessier-Selvon;E. Lieb;E. Lillestol;E. Lillethun;J. Lindgren;I. Lippi;R. Llosa;B. Loerstad;M. Lokajicek;J.G. Loken;A. Lopez;M.A. Lopez Aguera;D. Loukas;J.J. Lozano;R. Lucock;B. Lund-Jensen;P. Lutz;L. Lyons;G. Maehlum;J. Maillard;A. Maltezos;F. Mandl;J. Marco;J.C. Marin;A. Markou;L. Mathis;C. Matteuzzi;G. Matthiae;M. Mazzucato;M. Mc Cubbin;R. Mc Kay;E. Menichetti;C. Meroni;W.T. Meyer;W.A. Mitaroff;G.V. Mitselmakher;U. Mjoernmark;T. Moa;R. Moeller;K. Moenig;M.R. Monge;P. Morettini;H. Mueller;H. Muller;G. Myatt;F. Naraghi;U. Nau-Korzen;F.L. Navarria;P. Negri;B.S. Nielsen;M. Nigro;V. Nikolaenko;V. Obraztsov;R. Orava;A. Ouraou;R. Pain;K. Pakonski;H. Palka;T. Papadopoulou;L. Pape;P. Pasini;A. Passeri;M. Pegoraro;V. Perevozchikov;M. Pernicka;M. Pimenta;O. Pingot;C. Pinori;A. Pinsent;M.E. Pol;B. Poliakov;G. Polok;P. Poropat;P. Privitera;A. Pullia;J. Pyyhtia;A.A. Rademakers;D. Radojicic;S. Ragazzi;W.H. Range;P.N. Ratoff;A.L. Read;N.G. Redaelli;M. Regler;D. Reid;P.B. Renton;L.K. Resvanis;F. Richard;J. Ridky;G. Rinaudo;I. Roditi;A. Romero;P. Ronchese;E. Rosenberg;U. Rossi;E. Rosso;P. Roudeau;T. Rovelli;V. Ruhlmann;A. Ruiz;H. Saarikko;Y. Sacquin;E. Sanchez;J. Sanchez;E. Sanchis;M. Sannino;M. Schaeffer;H. Schneider;F. Scuri;A. Sebastia;A.M. Segar;R. Sekulin;M. Sessa;G. Sette;R. Seufert;R.C. Shellard;P. Siegrist;S. Simonetti;F. Simonetto;A.N. Sissakian;T.B. Skaali;J. Skeens;G. Skjevling;G. Smadja;G.R. Smith;R. Sosnowski;K. Spang;T. Spassoff;E. Spiriti;S. Squarcia;H. Staeck;C. Stanescu;G. Stavropoulos;F. Stichelbaut;A. Stocchi;J. Strauss;R. Strub;C. Stubenrauch;M. Szczekowski;M. Szeptycka;P. Szymanski;S. Tavernier;E. Tchernyaev;G. Theodosiou;A. Tilquin;J. Timmermans;V.G. Timofeev;L.G. Tkatchev;D.Z. Toet;A.K. Topphol;L. Tortora;D. Treille;U. Trevisan;G. Tristram;C. Troncon;E.N. Tsyganov;M. Turala;R. Turchetta;M.L. Turluer;T. Tuuva;I.A. Tyapkin;M. Tyndel;S. Tzamarias;F. Udo;S. Ueberschaer;V.A. Uvarov;G. Valenti;E. Vallazza;J.A. Valls;G.W. Van Apeldoorn;P. Van Dam;W.K. Van Doninck;N. Van Eijndhoven;C. Vander Velde;J. Varela;P. Vaz;G. Vegni;M.E. Veitch;J. Velasco;L. Ventura;W. Venus;F. Verbeure;L.S. Vertogradov;L. Vibert;D. Vilanova;N.K. Vishnevskiy;E.V. Vlasov;A.S. Vodopianov;M. Vollmer;G. Voulgaris;M. Voutilainen;V. Vrba;H. Wahlen;C. Walck;F. Waldner;M. Wayne;P. Weilhammer;J. Werner;A.M. Wetherell;J.H. Wickens;J. Wikne;W.S.C. Williams;M. Winter;D. Wormald;G. Wormser;K. Woschnagg;N. Yamdagni;P. Yepes;A. Zaitsev;A. Zalewska;P. Zalewski;P.I. Zarubin;E. Zevgolatakos;G. Zhang;N.I. Zimin;R. Zitoun;R. Zukanovich Funchal;G. Zumerle;J. ZunigaP., Abreu; W., Adam; F., Adami; T., Adye; G. D., Alekseev; J. V., Allaby; P., Allen; S., Almehed; F., Alted; S. J., Alvsvaag; U., Amaldi; E., Anassontzis; W. D., Apel; B., Asman; C., Astor Ferreres; J. E., Augustin; A., Augustinus; P., Baillon; P., Bambade; F., Barao; G., Barbiellini; Bardin, D. Y. u.; A., Baroncelli; O., Barring; W., Bartl; M. J., Bates; M., Baubillier; K. H., Becks; C. J., Beeston; P., Beilliere; I., Belokopytov; P., Beltran; D., Benedic; J. M., Benlloch; M., Berggren; D., Bertrand; S., Biagi; F., Bianchi; J. H., Bibby; M. S., Bilenky; P., Billoir; J., Bjarne; D., Bloch; P. N., Bogolubov; D., Bollini; T., Bolognese; M., Bonapart; P. S. L., Booth; M., Boratav; P., Borgeaud; H., Borner; C., Bosio; O., Botner; B., Bouquet; Bozzo, Marco; S., Braibant; P., Branchini; K. D., Brand; R. A., Brenner; C., Bricman; R. C. A., Brown; N., Brummer; J. M., Brunet; L., Bugge; T., Buran; H., Burmeister; C. M., Buttar; J. A. M. A., Buytaert; M., Caccia; M., Calvi; A. J., Camacho Rozas; J. E., Campagne; A., Campion; T., Camporesi; V., Canale; F., Cao; L., Carroll; Caso, Carlo; E., Castelli; M. V., Castillo Gimenez; A., Cattai; F. R., Cavallo; L., Cerrito; P., Charpentier; P., Checchia; G. A., Chelkov; L., Chevalier; P. V., Chliapnikov; V., Chorowicz; R., Cirio; M. P., Clara; J. L., Contreras; Contri, Roberto; G., Cosme; F., Couchot; H. B., Crawley; D., Crennell; M., Cresti; G., Crosetti; N., Crosland; M., Crozon; J., Cuevas Maestro; S., Czellar; S., Dagoret; E., Dahl Jensen; B., D'Almagne; M., Dam; G., Damgaard; G., Darbo; E., Daubie; M., Davenport; P., David; A., De Angelis; M., De Beer; H., De Boeck; W., De Boer; C., De Clercq; M. D. M., De Fez Laso; N., De Groot; C., De La Vaissiere; B., De Lotto; C., Defoix; D., Delikaris; P., Delpierre; N., Demaria; A., De Min; L., Di Ciaccio; A. N., Diddens; H., Dijkstra; F., Djama; J., Dolbeau; K., Doroba; M., Dracos; J., Drees; M., Dris; W., Dulinski; R., Dzhelyadin; D. N., Edwards; L. O., Eek; P. A. M., Eerola; T., Ekelof; G., Ekspong; J. P., Engel; V., Falaleev; A., Fenyuk; M., Fernandez Alonso; A., Ferrer; Ferroni, Sergio; T. A., Filippas; A., Firestone; H., Foeth; E., Fokitis; Fontanelli, Flavio; H., Forsbach; B., Franek; K. E., Fransson; P., Frenkiel; D. C., Fries; R., Fruhwirth; F., Fulda Quenzer; H., Fuerstenau; J., Fuster; J. M., Gago; G., Galeazzi; D., Gamba; U., Gasparini; P., Gavillet; S., Gawne; E. N., Gazis; P., Giacomelli; K. W., Glitza; R., Gokieli; V. M., Golovatyuk; A., Goobar; G., Gopal; M., Gorski; Gracco, Valerio; A., Grant; F., Grard; E., Graziani; M. H., Gros; G., Grosdidier; B., Grossetete; S., Gumenyuk; J., Guy; F., Hahn; M., Hahn; S., Haider; Z., Hajduk; A., Hakansson; A., Hallgren; K., Hamacher; G., Hamel De Monchenault; J. F., Harris; B., Heck; I., Herbst; J. J., Hernandez; P., Herquet; H., Herr; E., Higon; H. J., Hilke; T., Hofmokl; R., Holmes; S. O., Holmgren; J. E., Hooper; M., Houlden; J., Hrubec; P. O., Hulth; K., Hultqvist; D., Husson; B. D., Hyams; P., Ioannou; P. S., Iversen; J. N., Jackson; P., Jalocha; G., Jarlskog; P., Jarry; B., Jean Marie; E. K., Johansson; M., Jonker; L., Jonsson; P., Juillot; R. B., Kadyrov; G., Kalkanis; G., Kalmus; G., Kantardjian; F., Kapusta; P., Kapusta; S., Katsanevas; E. C., Katsoufis; R., Keranen; J., Kesteman; B. A., Khomenko; B., King; N. J., Kjaer; H., Klein; W., Klempt; A., Klovning; P., Kluit; J. H., Koehne; B., Koene; P., Kokkinias; M., Kopf; M., Koratzinos; K., Korcyl; A. V., Korytov; B., Korzen; C., Kourkoumelis; T., Kreuzberger; J., Krolikowski; U., Kruener Marquis; W., Krupinski; W., Kucewicz; K., Kurvinen; M. I., Laakso; C., Lambropoulos; J. W., Lamsa; L., Lanceri; V., Lapin; J. P., Laugier; R., Lauhakangas; P., Laurikainen; G., Leder; F., Ledroit; J., Lemonne; G., Lenzen; V., Lepeltier; A., Letessier Selvon; E., Lieb; E., Lillestol; E., Lillethun; J., Lindgren; I., Lippi; R., Llosa; B., Loerstad; M., Lokajicek; J. G., Loken; A., Lopez; M. A., Lopez Aguera; D., Loukas; J. J., Lozano; R., Lucock; B., Lund Jensen; P., Lutz; L., Lyons; G., Maehlum; J., Maillard; A., Maltezos; F., Mandl; J., Marco; J. C., Marin; A., Markou; L., Mathis; C., Matteuzzi; G., Matthiae; M., Mazzucato; M., Mc Cubbin; R., Mc Kay; E., Menichetti; C., Meroni; W. T., Meyer; W. A., Mitaroff; G. V., Mitselmakher; U., Mjoernmark; T., Moa; R., Moeller; K., Moenig; Monge, MARIA ROBERTA; P., Morettini; H., Mueller; H., Muller; G., Myatt; F., Naraghi; U., Nau Korzen; F. L., Navarria; P., Negri; B. S., Nielsen; M., Nigro; V., Nikolaenko; V., Obraztsov; R., Orava; A., Ouraou; R., Pain; K., Pakonski; H., Palka; T., Papadopoulou; L., Pape; P., Pasini; A., Passeri; M., Pegoraro; V., Perevozchikov; M., Pernicka; M., Pimenta; O., Pingot; C., Pinori; A., Pinsent; M. E., Pol; B., Poliakov; G., Polok; P., Poropat; P., Privitera; A., Pullia; J., Pyyhtia; A. A., Rademakers; D., Radojicic; S., Ragazzi; W. H., Range; P. N., Ratoff; A. L., Read; N. G., Redaelli; M., Regler; D., Reid; P. B., Renton; L. K., Resvanis; F., Richard; J., Ridky; G., Rinaudo; I., Roditi; A., Romero; P., Ronchese; E., Rosenberg; U., Rossi; E., Rosso; P., Roudeau; T., Rovelli; V., Ruhlmann; A., Ruiz; H., Saarikko; Y., Sacquin; E., Sanchez; J., Sanchez; E., Sanchis; Sannino, Mario; M., Schaeffer; H., Schneider; F., Scuri; A., Sebastia; A. M., Segar; R., Sekulin; M., Sessa; Sette, Giuseppe; R., Seufert; R. C., Shellard; P., Siegrist; S., Simonetti; F., Simonetto; A. N., Sissakian; T. B., Skaali; J., Skeens; G., Skjevling; G., Smadja; G. R., Smith; R., Sosnowski; K., Spang; T., Spassoff; E., Spiriti; Squarcia, Sandro; H., Staeck; C., Stanescu; G., Stavropoulos; F., Stichelbaut; A., Stocchi; J., Strauss; R., Strub; C., Stubenrauch; M., Szczekowski; M., Szeptycka; P., Szymanski; S., Tavernier; E., Tchernyaev; G., Theodosiou; A., Tilquin; J., Timmermans; V. G., Timofeev; L. G., Tkatchev; D. Z., Toet; A. K., Topphol; L., Tortora; D., Treille; Trevisan, Umberto; G., Tristram; C., Troncon; E. N., Tsyganov; M., Turala; R., Turchetta; M. L., Turluer; T., Tuuva; I. A., Tyapkin; M., Tyndel; S., Tzamarias; F., Udo; S., Ueberschaer; V. A., Uvarov; G., Valenti; E., Vallazza; J. A., Valls; G. W., Van Apeldoorn; P., Van Dam; W. K., Van Doninck; N., Van Eijndhoven; C., Vander Velde; J., Varela; P., Vaz; G., Vegni; M. E., Veitch; J., Velasco; L., Ventura; W., Venus; F., Verbeure; L. S., Vertogradov; L., Vibert; D., Vilanova; N. K., Vishnevskiy; E. V., Vlasov; A. S., Vodopianov; M., Vollmer; G., Voulgaris; M., Voutilainen; V., Vrba; H., Wahlen; C., Walck; F., Waldner; M., Wayne; P., Weilhammer; J., Werner; A. M., Wetherell; J. H., Wickens; J., Wikne; W. S. C., Williams; M., Winter; D., Wormald; G., Wormser; K., Woschnagg; N., Yamdagni; P., Yepes; A., Zaitsev; A., Zalewska; P., Zalewski; P. I., Zarubin; E., Zevgolatakos; G., Zhang; N. I., Zimin; R., Zitoun; R., Zukanovich Funchal; G., Zumerle; J., Zunig

A Comparison of jet production rates on the Z0 resonance to perturbative QCD

The production rates for 2-, 3-, 4- and 5-jet hadronic final states have been measured with the DELPHI detector at the e+e- storage ring LEP at centre of mass energies around 91.5 GeV. Fully corrected data are compared to O(αs 2) QCD matrix element calculations and the QCD scale parameter ΛMS is determined for different parametrizations of the renormalization scale μ2. Including all uncertainties our result is αs(MZ 2)=0.114±0.003[stat.]±0.004[syst.]±0.012[theor.] .0SCOPUS: ar.jinfo:eu-repo/semantics/publishe

SEARCH FOR LIGHT NEUTRAL HIGGS PARTICLES PRODUCED IN Z0 DECAYS

A search for the neutral Higgs boson in Z0-decays has been performed using the DELPHI detector at the Large Electron Positron collider (LEP) at CERN. We looked for the decay of Z0 into a neutral Higgs particle and a pair of fermions. No events fulfilled the criteria for H0-production. Our results, which are based on an integrated luminosity of 530 nb-1, exclude a minimal Standard Model Higgs boson with a mass in the range 210 MeV/c2 to 14 GeV/c2 at 95% confidence level.0SCOPUS: ar.jinfo:eu-repo/semantics/publishe