Data di Pubblicazione:
1994
Abstract:
The total and the differential cross sections for the reaction e+e- --> gammagamma(gamma) have been measured with the DELPHI detector at LEP using an integrated luminosity of 36.9 pb-1. The results agree with the QED predictions and consequently there is no evidence for non-standard channels with the same experimental signature. The lower limits obtained on the QED cutoff parameters are LAMBDA+ > 143 GeV and LAMBDA- > 120 GeV, and the lower bound on the mass of an excited electron with an effective coupling constant lambda(gamma) = 1 is 132 GeV/c2. Upper limits on the branching ratios for the decays Z0 --> gammagamma, Z0 --> pi0gamma, Z0 --> etagamma and Z0 --> gammagammagamma have been determined to be 5.5 x 10(-5), 5.5 x 10(-5), 8.0 x 10(-5), and 1.7 x 10-5 respectively. All the limits are at the 95% confidence level.
Tipologia CRIS:
03A-Articolo su Rivista
Elenco autori:
P. ABREU;W. ADAM;T. ADYE;E. AGASI;I. AJINENKO;R. ALEKSAN;G. D. ALEKSEEV;P. P. ALLPORT;S. ALMEHED;F. M. L.;S. J. ALVSVAAG;U. AMALDI;A. ANDREAZZA;P. ANTILOGUS;W. D. APEL;R. J. APSIMON;Y. ARNOUD;B. ASMAN;J. E. AUGUSTIN;A. AUGUSTINUS;P. BAILLON;P. BAMBADE;F. BARAO;R. BARATE;G. BARBIELLINI;D. Y. BARDIN;G. J. BARKER;A. BARONCELLI;O. BARRING;J. A. BARRIO;W. BARTL;M. J. BATES;M. BATTAGLIA;M. BAUBILLIER;K. H. BECKS;M. BEGALLI;P. BEILLIERE;P. BELTRAN;A. C. BENVENUTI;M. BERGGREN;D. BERTRAND;F. BIANCHI;M. BIGI;M. S. BILENKY;P. BILLOIR;J. BJARNE;D. BLOCH;J. BLOCKI;S. BLYTH;V. BOCCI;P. N. BOGOLUBOV;T. BOLOGNESE;M. BONESINI;W. BONIVENTO;P. S. L.;G. BORISOV;C. BOSIO;B. BOSTJANCIC;S. BOSWORTH;O. BOTNER;B. BOUQUET;C. BOURDARIOS;T. J. V.;M. BOZZO;S. BRAIBANT;P. BRANCHINI;K. D. BRAND;R. R. A.;H. BRIAND;C. BRICMAN;L. BRILLAULT;R. C. A.;J. M. BRUNET;L. BUGGE;T. BURAN;A. BUYS;J. A. M.;M. CACCIA;M. CALVI;A. J. C.;R. CAMPION;T. CAMPORESI;V. CANALE;K. CANKOCAK;F. CAO;F. CARENA;P. CARRILHO;L. CARROLL;R. CASES;C. CASO;M. V. C.;A. CATTAI;F. R. CAVALLO;L. CERRITO;V. CHABAUD;A. CHAN;M. CHAPKIN;P. CHARPENTIER;J. CHAUVEAU;P. CHECCHIA;G. A. CHELKOV;L. CHEVALIER;P. CHLIAPNIKOV;V. CHOROWICZ;J. T. M.;V. CINDRO;P. COLLINS;J. L. CONTRERAS;R. CONTRI;E. CORTINA;G. COSME;F. COUCHOT;H. B. CRAWLEY;D. CRENNELL;G. CROSETTI;J. C. MAESTRO;S. CZELLAR;E. DAHLJENSEN;J. DAHM;B. DALMAGNE;M. DAM;G. DAMGAARD;E. DAUBIE;A. DAUM;P. D. DAUNCEY;M. DAVENPORT;J. DAVIES;W. DASILVA;C. DEFOIX;P. DELPIERRE;N. DEMARIA;A. DEANGELIS;H. DEBOECK;W. DEBOER;S. DEBRABANDERE;C. DECLERCQ;M. D. M.;C. DELAVAISSIERE;B. DELOTTO;A. DEMIN;L. DEPAULA;H. DIJKSTRA;L. DICIACCIO;F. DJAMA;J. DOLBEAU;M. DONSZELMANN;K. DOROBA;M. DRACOS;J. DREES;M. DRIS;Y. DUFOUR;F. DUPONT;D. EDSALL;L. O. EEK;R. EHRET;T. EKELOF;G. EKSPONG;M. ELSING;J. P. ENGEL;N. ERSHAIDAT;M. E. SANTO;V. FALALEEV;D. FASSOULIOTIS;M. FEINDT;A. FERRER;T. A. FILIPPAS;A. FIRESTONE;H. FOETH;E. FOKITIS;F. FONTANELLI;F. FORMENTI;J. L. FOUSSET;S. FRANCON;B. FRANKEL;P. FRENKIEL;D. C. FRIES;A. G. FRODESEN;R. FRUHWIRTH;F. FULDAQUENZER;H. FURSTENAU;J. FUSTER;D. GAMBA;M. GANDELMAN;C. GARCIA;J. GARCIA;C. GASPAR;U. GASPARINI;P. GAVILLET;E. N. GAZIS;J. P. GERBER;P. GIACOMELLI;D. GILLESPIE;R. GOLIELI;B. GOLOB;V. M. GOLOVATYUK;J. J. G.;G. GOPAL;L. GORN;M. GORSKI;V. GRACCO;F. GRARD;E. GRAZIANI;G. GROSDIDIER;B. GROSSETETE;P. GUNNARSSON;J. GUY;U. HAEDINGER;F. HAHN;M. HAHN;S. HAHN;S. HAIDER;Z. HAJDUK;A. HAKANSSON;A. HALLGREN;K. HAMACHER;G. H. DEMONCHENAULT;W. HAO;F. J. HARRIS;V. HEDBERG;R. HENRIQUES;J. J. HERXNANDEZ;J. A. HERNANDO;P. HERQUET;H. HERR;T. L. HESSING;E. HIGON;H. J. HILKE;T. S. HILL;S. O. HOLMGREN;P. J. HOLT;D. HOLTHUIZEN;P. F. HONORE;M. HOULDEN;J. HRUBEC;K. HUET;K. HULTQVIST;P. IOANNOU;P. S. IVERSEN;J. N. JACKSON;R. JACOBSSON;P. JALOCHA;G. JARLSKOG;P. JARRY;B. JEANMARIE;E. K. JOHANSSON;M. JONKER;L. JONSSON;P. JUILLOT;M. KAISER;G. KALMUS;F. KAPUSTA;M. KARLSSON;E. KARVELAS;A. KATARGIN;S. KATSANEVAS;E. C. KATSOUFIS;R. KERANEN;B. A. KHOMENKO;N. N. KHOVANSKI;B. KING;N. J. KJAER;H. KLEIN;A. KLOVNING;P. KLUIT;A. KOCHMEHRIN;J. H. KOEHNE;B. KOENE;P. KOKKINIAS;M. KORATZINOS;K. KORCYL;A. V. KORYTOV;V. KOSTIOUKHINE;C. KOURKOUMELIS;O. KOUZNETSOV;P. H. KRAMER;M. KRAMMER;C. KREUTER;J. KROLIKOWSKI;I. KRONKVIST;W. KRUPINSKI;K. KULKA;K. KURVINEN;C. LACASTA;C. LAMBROPOULOS;J. W. LAMSA;L. LANCERI;P. LANGEFELD;V. LAPIN;I. LAST;J. P. LAUGIER;R. LAUHAKANGAS;G. LEDER;F. LEDROIT;R. LEITNER;Y. LEMOIGNE;J. LEMONNE;G. LENZEN;V. LEPELTIER;T. LESIAK;J. M. LEVY;E. LIEB;A. LOPEZFERNANDEZ;M. A. L.;M. LOS;D. LOUKAS;J. J. LOZANO;P. LUTZ;L. LYONS;G. MAEHLUM;J. C. MARIN;C. MARIOTTI;A. MARKOU;T. MARON;S. MARTI;C. MARTINEZRIVERO;F. MARTINEZVIDAL;F. MATORRAS;C. MATTEUZZI;G. MATTHIAE;M.
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