We search for neutral heavy leptons that are isosinglets under the standard SU(2)L gauge group. Such neutral heavy leptons are expected in many extensions of the standard model. Three types of heavy leptons Ne, N(mu), N(tau) associated with the three neutrino types nu(e), nu(mu), nu(tau) have been directly searched for and no evidence for a signal has been found. We set the limit Br(Z0 --> nu(l)N(l)) < 3 x 10(-5) at the 95% CL for the mass range from 3 GeV up to m(Z).
Search For Isosinglet Neutral Heavy-leptons In Z0 Decays / O. ADRIANI;M. AGUILARBENITEZ;S. AHLEN;J. ALCARAZ;A. ALOISIO;G. ALVERSON;M. G. ALVIGGI;G. AMBROSI;Q. AN;H. ANDERHUB;A. L. ANDERSON;V. P. ANDREEV;T. ANGELOV;L. ANTONOV;D. ANTREASYAN;P. ARCE;A. AREFIEV;A. ATAMANCHUK;T. AZEMOON;T. AZIZ;P. V. K.;P. BAGNAIA;J. A. BAKKEN;L. BAKSAY;R. C. BALL;S. BANERJEE;J. BAO;R. BARILLERE;L. BARONE;A. BASCHIROTTO;R. BATTISTON;A. BAY;F. BECATTINI;U. BECKER;F. BEHNER;J. BEHRENS;S. BEINGESSNER;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;M. BOCCIOLINI;R. BOCK;A. BOHM;B. BORGIA;M. BOSETI;D. BOURILKOV;M. BOURQUIN;D. BOUTIGNY;B. BOUWENS;E. BRAMBILLA;J. G. BRANSON;I. C. BROCK;M. BROOKS;C. BUISSON;A. BUJAK;J. D. BURGER;W. J. BURGER;J. BUSENITZ;X. D. CAI;M. CAPELL;M. CARIA;G. CARLINO;F. CARMINATI;A. M. CARTACCI;R. CASTELLO;M. CERRADA;F. CESARONI;Y. H. CHANG;U. K. CHATURVEDI;M. CHEMARIN;A. CHEN;C. CHEN;G. M. CHEN;H. F. 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VANDEWALLE;I. VETLITSKY;G. VIERTEL;P. VIKAS;U. VIKAS;M. VIVARGENT;H. VOGEL;H. VOGT;L. VOROBIEV;A. A. VOROBYOV;L. VUILLEUMIER;M. WADHWA;W. WALLRAFF;C. R. WANG;G. H. WANG;J. H. WANG;X. L. WANG;Y. F. WANG;Z. M. WANG;A. WEBER;J. WEBER;R. WEILL;T. J. WENAUS;J. WENNINGER;M. WHITE;C. WILLMOTT;F. WITTGENSTEIN;D. WRIGHT;R. J. WU;S. X. WU;Y. G. WU;B. WYSLOUCH;Y. Y. XIE;Y. D. XU;Z. Z. XU;Z. L. XUE;D. S. YAN;X. J. YAN;B. Z. YANG;C. G. YANG;G. YANG;K. S. YANG;Q. Y. YANG;Z. Q. YANG;C. H. YE;J. B. YE;Q. YE;S. C. YEH;Z. W. YIN;J. M. YOU;N. YUNUS;M. YZERMAN;C. ZACCARDELLI;P. ZEMP;M. ZENG;Y. ZENG;D. H. ZHANG;Z. P. ZHANG;B. ZHOU;J. F. ZHOU;R. Y. ZHU;H. L. ZHUANG;A. ZICHICHI;B. C. C.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 295:(1992), pp. 371-382. [10.1016/0370-2693(92)91579-X]
Search For Isosinglet Neutral Heavy-leptons In Z0 Decays
ADRIANI, OSCAR;D'ALESSANDRO, RAFFAELLO;M. LENTI;
1992
Abstract
We search for neutral heavy leptons that are isosinglets under the standard SU(2)L gauge group. Such neutral heavy leptons are expected in many extensions of the standard model. Three types of heavy leptons Ne, N(mu), N(tau) associated with the three neutrino types nu(e), nu(mu), nu(tau) have been directly searched for and no evidence for a signal has been found. We set the limit Br(Z0 --> nu(l)N(l)) < 3 x 10(-5) at the 95% CL for the mass range from 3 GeV up to m(Z).I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.