Total and differential cross sections for the process e(+)e(-) --> gamma gamma(gamma), and the total cross section for the process e(+)e(-) --> gamma gamma gamma, are measured at energies around 91 GeV using the data collected with the L3 detector from 1991 to 1993. We set lower limits, at 95% CL, on a contact interaction energy scale parameter Lambda > 602 GeV, on the mass of an excited electron m(c)* > 146 GeV and on the QED cut-off parameters Lambda(+) > 149 GeV and Lambda(-) > 143 GeV. Upper limits are also set on the branching fractions of Z decaying into gamma gamma, pi degrees gamma and eta gamma of 5.2 x 10(-5), 5.2 x 10(-5) and 7.6 x 10(-5) respectively. The reactions e(+)e(-) --> rho(+)rho(-)n gamma (rho = e, mu, tau) are studied using the data collected from 1990 to 1994. The data are consistent with the QED expectations.

Tests Qed At Lep Energies Using E(+)e(-)-]gamma-gamma(gamma) and E(+)e(-)-]l(+)l(-)gamma-gamma / M. ACCIARRI;A. ADAM;O. ADRIANI;M. AGUILARBENITEZ;S. AHLEN;B. ALPAT;J. ALCARAZ;J. ALLABY;A. ALOISIO;G. ALVERSON;M. G. ALVIGGI;G. AMBROSI;Q. AN;H. ANDERHUB;V. P. ANDREEV;T. ANGELESCU;D. ANTREASYAN;A. AREFIEV;T. AZEMOON;T. AZIZ;P. V. K.;P. BAGNAIA;L. BAKSAY;R. C. BALL;S. BANERJEE;K. BANICZ;R. BARILLERE;L. BARONE;P. BARTALINI;A. BASCHIROTTO;M. BASILE;R. BATTISTON;A. BAY;F. BECATTINI;U. BECKER;F. BEHNER;G. L. BENCZE;J. BERDUGO;P. BERGES;B. BERTUCCI;B. L. BETEV;M. BIASINI;A. BILAND;G. M. BILEI;R. BIZZARRI;J. J. BLAISING;G. J. BOBBINK;R. BOCK;A. BOHM;B. BORGIA;A. BOUCHAM;D. BOURILKOV;A. BUYTENHUIJS;X. D. CAI;M. CAPELL;G. C. ROMEO;M. CARIA;G. CARLINO;A. M. CARTACCI;J. CASAUS;G. CASTELLINI;R. CASTELLO;N. CAVALLO;C. CECCHI;M. CERRADA;F. CESARONI;M. CHAMIZO;A. CHAN;Y. H. CHANG;U. K. CHATURVEDI;M. CHEMARIN;A. CHEN;C. CHEN;G. CHEN;M. CHEN;H. F. CHEN;H. S. CHEN;M. CHEN;G. CHIEFARI;C. Y. CHIEN;M. T. CHOI;L. CIFARELLI;F. CINDOLO;C. CIVININI;I. CLARE;R. CLARE;T. E. COAN;H. O. COHN;G. COIGNET;N. COLINO;V. COMMICHAU;S. COSTANTINI;F. COTOROBAI;B. DELACRUZ;X. T. CUI;X. Y. CUI;T. S. DAI;R. DALESSANDRO;R. DEASMUNDIS;H. DEBOECK;A. DEGRE;K. DEITERS;E. DENES;P. DENES;F. DENOTARISTEFANI;D. DIBITONTO;M. DIEMOZ;C. DIONISI;M. DITTMAR;A. DOMINGUEZ;A. DORIA;I. DORNE;M. T. DOVA;E. DRAGO;D. DUCHESNEAU;P. DUINKER;I. DURAN;S. DUTTA;S. EASO;Y. EFREMENKO;H. ELMAMOUNI;A. ENGLER;F. J. EPPLING;F. C. ERNE;J. P. ERNENWEIN;P. EXTERMANN;R. FABBRETTI;M. FABRE;R. FACCINI;S. FALCIANO;A. FAVARA;J. FAY;M. FELCINI;T. FERGUSON;D. FERNANDEZ;G. FERNANDEZ;F. FERRONI;H. FESEFELDT;E. FIANDRINI;J. H. FIELD;F. FILTHAUT;P. H. FISHER;G. FORCONI;L. FREDJ;K. FREUDENREICH;M. GAILLOUD;Y. GALAKTIONOV;S. N. GANGULI;P. GARCIAABIA;S. S. GAU;S. GENTILE;J. GERALD;N. GHEORDANESCU;S. GIAGU;S. GOLDFARB;J. GOLDSTEIN;Z. F. GONG;E. GONZALEZ;A. GOUGAS;D. GOUJON;G. GRATTA;M. W. GRUENEWALD;C. GU;M. GUANZIROLI;V. K. GUPTA;A. GURTU;H. R. 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WADHWA;W. WALLRAFF;J. C. WANG;X. L. WANG;Y. F. WANG;Z. M. WANG;A. WEBER;R. WEILL;C. WILLMOTT;F. WITTGENSTEIN;S. X. WU;S. WYNHOFF;J. XU;Z. Z. XU;B. Z. YANG;C. G. YANG;G. YANG;X. Y. YAO;C. H. YE;J. B. YE;Q. YE;S. C. YEH;J. M. YOU;N. YUNUS;M. YZERMAN;C. ZACCARDELLI;A. ZALITE;P. ZEMP;J. Y. ZENG;M. ZENG;Y. ZENG;Z. ZHANG;Z. P. ZHANG;B. ZHOU;G. J. ZHOU;J. F. ZHOU;Y. ZHOU;G. Y. ZHU;R. Y. ZHU;A. ZICHICHI;B. C. C.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 353:(1995), pp. 136-144. [10.1016/0370-2693(95)00527-R]

Tests Qed At Lep Energies Using E(+)e(-)-]gamma-gamma(gamma) and E(+)e(-)-]l(+)l(-)gamma-gamma

ADRIANI, OSCAR;D'ALESSANDRO, RAFFAELLO;M. LENTI;
1995

Abstract

Total and differential cross sections for the process e(+)e(-) --> gamma gamma(gamma), and the total cross section for the process e(+)e(-) --> gamma gamma gamma, are measured at energies around 91 GeV using the data collected with the L3 detector from 1991 to 1993. We set lower limits, at 95% CL, on a contact interaction energy scale parameter Lambda > 602 GeV, on the mass of an excited electron m(c)* > 146 GeV and on the QED cut-off parameters Lambda(+) > 149 GeV and Lambda(-) > 143 GeV. Upper limits are also set on the branching fractions of Z decaying into gamma gamma, pi degrees gamma and eta gamma of 5.2 x 10(-5), 5.2 x 10(-5) and 7.6 x 10(-5) respectively. The reactions e(+)e(-) --> rho(+)rho(-)n gamma (rho = e, mu, tau) are studied using the data collected from 1990 to 1994. The data are consistent with the QED expectations.
1995
353
136
144
M. ACCIARRI;A. ADAM;O. ADRIANI;M. AGUILARBENITEZ;S. AHLEN;B. ALPAT;J. ALCARAZ;J. ALLABY;A. ALOISIO;G. ALVERSON;M. G. ALVIGGI;G. AMBROSI;Q....espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/772815
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