We have looked for evidence of excited lepton production in Z0 decay observed in the ALEPH detector at LEP. We find no ℓℓγγ events and set new limits at 95% CL on ℓ∗ masses at 44.6, 44.6 and 41.2 GeV/c2 for View the MathML source respectively. Observed events in the ℓℓγ channels are consistent with radiative effects and we set limits for the first time on the View the MathML source coupling for ℓ∗ masses in the range up to 86 GeV/c2.

Search for excited leptons in Z0 decay / D. Decamp;B. Deschizeaux;J.-P. Lees;M.-N. Minard;J.M. Crespo;M. Delfino;E. Fernandez;M. Martinez;R. Miquel;Ll.M. Mir;S. Orteu;A. Pacheco;J.A. Perlas;E. Tubau;M.G. Catanesi;M. De Palma;A. Farilla;G. Iaselli;G. Maggi;S. Natali;S. Nuzzo;A. Ranieri;G. Raso;F. Romano;F. Ruggieri;G. Selvaggi;L. Silvestris;P. Tempesta;G. Zito;H. Hu;D. Huang;J. Lin;T. Ruan;T. Wang;W. Wu;Y. Xie;D. Xu;R. Xu;J. Zhang;W. Zhao;H. Albrecht;W.B. Atwood;F. Bird;E. Blucher;T.H. Burnett;T. Charity;H. Drevermann;Ll. Garrido;C. Grab;R. Hagelberg;S. Haywood;B. Jost;M. Kasemann;G. Kellner;J. Knobloch;A. Lacourt;I. Lehraus;T. Lohse;D. Lüke;A. Marchioro;P. Mato;J. May;A. Minten;A. Miotto;P. Palazzi;M. Pepe-Altarelli;F. Ranjard;A. Roth;J. Rothberg;H. Rotscheidt;W. Von Rüden;R.St. Denis;D. Schlatter;M. Takashima;M. Talby;H. Taureg;W. Tejessy;H. Wachsmuth;S. Wheeler;W. Wiedenmann;W. Witzeling;J. Wotschack;Z. Ajaltouni;M. Bardadin-Otwinowska;A. Falvard;P. Gay;P. Henrard;J. Jousset;B. Michel;J-C. Montret;D. Pallin;P. Perret;J. Proriol;F. Prulhiére;J.D. Hansen;J.R. Hansen;P.H. Hansen;R. Møllerud;G. Petersen;E. Simopoulou;A. Vayaki;J. Badier;A. Blondel;G. Bonneaud;J. Bourotte;F. Braems;J.C. Brient;M.A. Ciocci;G. Fouque;R. Guirlet;A. Rougé;M. Rumpf;R. Tanaka;H. Videau;I. Videau;D.J. Candlin;A. Conti;G. Parrini;M. Corden;C. Georgiopoulos;J.H. Goldman;M. Ikeda;J. Lannutti;D. Levinthal;M. Mermikides;L. Sawyer;G. Stimpfl;A. Antonelli;R. Baldini;G. Bencivenni;G. Bologna;F. Bossi;P. Campana;G. Capon;V. Chiarella;G. De Ninno;B. D'Ettorre-Piazzoli;G. Felici;P. Laurelli;G. Mannocchi;F. Murtas;G.P. Murtas;G. Nicoletti;P. Picchi;P. Zografou;B. Altoon;O. Boyle;A.W. Halley;I. Ten Have;J.L. Hearns;I.S. Hughes;J.G. Lynch;W.T. Morton;C. Raine;J.M. Scarr;K. Smith;A.S. Thompson;B. Brandl;O. Braun;R. Geiges;C. Geweniger;P. Hanke;V. Hepp;E.E. Kluge;Y. Maumary;M. Panter;A. Putzer;B. Rensch;A. Stahl;K. Tittel;M. Wunsch;A.T. Belk;R. Beuselinck;D.M. Binnie;W. Cameron;M. Cattaneo;P.J. Dornan;S. Dugeay;R.W. Forty;A.M. Greene;J.F. Hassard;S.J. Patton;J.K. Sedgbeer;G. Taylor;I.R. Tomalin;A.G. Wright;P. Girtler;D. Kuhn;G. Rudolph;C.K. Bowdery;T.J. Brodbeck;A.J. Finch;F. Foster;G. Hughes;N.R. Keemer;M. Nuttall;B.S. Rowlingson;T. Sloan;S.W. Snow;T. Barczewski;L.A.T. Bauerdick;K. Kleinknecht;B. Renk;S. Roehn;H.-G. Sander;M. Schmelling;F. Steeg;J.-P. Albanese;J.-J. Aubert;C. Benchouk;A. Bonissent;D. Courvoisier;F. Etienne;E. Matsinos;S. Papalexiou;P. Payre;B. Pietrzyk;Z. Qian;W. Blum;P. Catteneo;G. Cowan;B. Dehning;H. Dietl;M. Fernandez-Bosman;D. Hauff;A. Jahn;E. Lange;G. Lütjens;G. Lutz;W. Männer;H.-G. Moser;Y. Pan;R. Richter;A.S. Schwarz;R. Settles;U. Stiegler;U. Stierlin;J. Thomas;G. Waltermann;V. Bertin;G. De Bouard;J. Boucrot;O. Callot;X. Chen;A. Cordier;M. Davier;G. Ganis;J.-F. Grivaz;Ph. Heusse;P. Janot;V. Journé;D.W. Kim;J. Lefrançois;A.-M. Lutz;J.-J. Veillet;F. Zomer;S.R. Amendolia;G. Bagliesi;G. Batignani;L. Bosisio;U. Bottigli;C. Bradaschia;I. Ferrante;F. Fidecaro;L. Foá;E. Focardi;F. Forti;A. Giassi;M.A. Giorgi;F. Ligabue;A. Lusiani;E.B. Mannelli;P.S. Marrocchesi;A. Messineo;F. Palla;G. Sanguinetti;S. Scapellato;J. Steinberger;R. Tenchini;G. Tonelli;G. Triggiani;J.M. Carter;M.G. Green;P.V. March;T. Medcalf;M.R. Saich;J.A. Strong;R.M. Thomas;T. Wildish;D.R. Botterill;R.W. Clifft;T.R. Edgecock;M. Edwards;S.M. Fisher;J. Harvey;T.J. Jones;P.R. Norton;D.P. Salmon;J.C. Thompson;E. Aubourg;B. Bloch-Devaux;P. Colas;C. Klopfenstein;E. Lançon;E. Locci;S. Loucatos;L. Mirabito;E. Monnier;P. Perez;F. Perrier;J. Rander;J.-F. Renardy;A. Roussarie;J.-P. Schuller;J.G. Ashman;C.N. Booth;F. Combley;M. Dinsdale;J. Martin;D. Parker;L.F. Thompson;S. Brandt;H. Burkhardt;C. Grupen;H. Meinhard;E. Neugebauer;U. Schäfer;H. Seywerd;B. Gobbo;F. Liello;E. Millotti;F. Ragusa;L. Rolandi;L. Bellantoni;J.F. Boudreau;D. Cinabro;J.S. Conway;D.F. Cowen;Z. Feng;J.L. Harton;J. Hilgart;R.C. Jared;R.P. Johnson;B.W. Leclaire;Y.B. Pan;T. Parker;J.R. Pater;Y. Saadi;V. Sharma;J.A. Wear;F.V. Weber; Sau Lan Wu;S.T. Xue;G. Zobernig. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - ELETTRONICO. - 236:(1990), pp. 501-510. [10.1016/0370-2693(90)90391-I]

Search for excited leptons in Z0 decay

FOCARDI, ETTORE;
1990

Abstract

We have looked for evidence of excited lepton production in Z0 decay observed in the ALEPH detector at LEP. We find no ℓℓγγ events and set new limits at 95% CL on ℓ∗ masses at 44.6, 44.6 and 41.2 GeV/c2 for View the MathML source respectively. Observed events in the ℓℓγ channels are consistent with radiative effects and we set limits for the first time on the View the MathML source coupling for ℓ∗ masses in the range up to 86 GeV/c2.
1990
236
501
510
D. Decamp;B. Deschizeaux;J.-P. Lees;M.-N. Minard;J.M. Crespo;M. Delfino;E. Fernandez;M. Martinez;R. Miquel;Ll.M. Mir;S. Orteu;A. Pacheco;J.A. Perlas;E. Tubau;M.G. Catanesi;M. De Palma;A. Farilla;G. Iaselli;G. Maggi;S. Natali;S. Nuzzo;A. Ranieri;G. Raso;F. Romano;F. Ruggieri;G. Selvaggi;L. Silvestris;P. Tempesta;G. Zito;H. Hu;D. Huang;J. Lin;T. Ruan;T. Wang;W. Wu;Y. Xie;D. Xu;R. Xu;J. Zhang;W. Zhao;H. Albrecht;W.B. Atwood;F. Bird;E. Blucher;T.H. Burnett;T. Charity;H. Drevermann;Ll. Garrido;C. Grab;R. Hagelberg;S. Haywood;B. Jost;M. Kasemann;G. Kellner;J. Knobloch;A. Lacourt;I. Lehraus;T. Lohse;D. Lüke;A. Marchioro;P. Mato;J. May;A. Minten;A. Miotto;P. Palazzi;M. Pepe-Altarelli;F. Ranjard;A. Roth;J. Rothberg;H. Rotscheidt;W. Von Rüden;R.St. Denis;D. Schlatter;M. Takashima;M. Talby;H. Taureg;W. Tejessy;H. Wachsmuth;S. Wheeler;W. Wiedenmann;W. Witzeling;J. Wotschack;Z. Ajaltouni;M. Bardadin-Otwinowska;A. Falvard;P. Gay;P. Henrard;J. Jousset;B. Michel;J-C. Montret;D. Pallin;P. Perret;J. Proriol;F. Prulhiére;J.D. Hansen;J.R. Hansen;P.H. Hansen;R. Møllerud;G. Petersen;E. Simopoulou;A. Vayaki;J. Badier;A. Blondel;G. Bonneaud;J. Bourotte;F. Braems;J.C. Brient;M.A. Ciocci;G. Fouque;R. Guirlet;A. Rougé;M. Rumpf;R. Tanaka;H. Videau;I. Videau;D.J. Candlin;A. Conti;G. Parrini;M. Corden;C. Georgiopoulos;J.H. Goldman;M. Ikeda;J. Lannutti;D. Levinthal;M. Mermikides;L. Sawyer;G. Stimpfl;A. Antonelli;R. Baldini;G. Bencivenni;G. Bologna;F. Bossi;P. Campana;G. Capon;V. Chiarella;G. De Ninno;B. D'Ettorre-Piazzoli;G. Felici;P. Laurelli;G. Mannocchi;F. Murtas;G.P. Murtas;G. Nicoletti;P. Picchi;P. Zografou;B. Altoon;O. Boyle;A.W. Halley;I. Ten Have;J.L. Hearns;I.S. Hughes;J.G. Lynch;W.T. Morton;C. Raine;J.M. Scarr;K. Smith;A.S. Thompson;B. Brandl;O. Braun;R. Geiges;C. Geweniger;P. Hanke;V. Hepp;E.E. Kluge;Y. Maumary;M. Panter;A. Putzer;B. Rensch;A. Stahl;K. Tittel;M. Wunsch;A.T. Belk;R. Beuselinck;D.M. Binnie;W. Cameron;M. Cattaneo;P.J. Dornan;S. Dugeay;R.W. Forty;A.M. Greene;J.F. Hassard;S.J. Patton;J.K. Sedgbeer;G. Taylor;I.R. Tomalin;A.G. Wright;P. Girtler;D. Kuhn;G. Rudolph;C.K. Bowdery;T.J. Brodbeck;A.J. Finch;F. Foster;G. Hughes;N.R. Keemer;M. Nuttall;B.S. Rowlingson;T. Sloan;S.W. Snow;T. Barczewski;L.A.T. Bauerdick;K. Kleinknecht;B. Renk;S. Roehn;H.-G. Sander;M. Schmelling;F. Steeg;J.-P. Albanese;J.-J. Aubert;C. Benchouk;A. Bonissent;D. Courvoisier;F. Etienne;E. Matsinos;S. Papalexiou;P. Payre;B. Pietrzyk;Z. Qian;W. Blum;P. Catteneo;G. Cowan;B. Dehning;H. Dietl;M. Fernandez-Bosman;D. Hauff;A. Jahn;E. Lange;G. Lütjens;G. Lutz;W. Männer;H.-G. Moser;Y. Pan;R. Richter;A.S. Schwarz;R. Settles;U. Stiegler;U. Stierlin;J. Thomas;G. Waltermann;V. Bertin;G. De Bouard;J. Boucrot;O. Callot;X. Chen;A. Cordier;M. Davier;G. Ganis;J.-F. Grivaz;Ph. Heusse;P. Janot;V. Journé;D.W. Kim;J. Lefrançois;A.-M. Lutz;J.-J. Veillet;F. Zomer;S.R. Amendolia;G. Bagliesi;G. Batignani;L. Bosisio;U. Bottigli;C. Bradaschia;I. Ferrante;F. Fidecaro;L. Foá;E. Focardi;F. Forti;A. Giassi;M.A. Giorgi;F. Ligabue;A. Lusiani;E.B. Mannelli;P.S. Marrocchesi;A. Messineo;F. Palla;G. Sanguinetti;S. Scapellato;J. Steinberger;R. Tenchini;G. Tonelli;G. Triggiani;J.M. Carter;M.G. Green;P.V. March;T. Medcalf;M.R. Saich;J.A. Strong;R.M. Thomas;T. Wildish;D.R. Botterill;R.W. Clifft;T.R. Edgecock;M. Edwards;S.M. Fisher;J. Harvey;T.J. Jones;P.R. Norton;D.P. Salmon;J.C. Thompson;E. Aubourg;B. Bloch-Devaux;P. Colas;C. Klopfenstein;E. Lançon;E. Locci;S. Loucatos;L. Mirabito;E. Monnier;P. Perez;F. Perrier;J. Rander;J.-F. Renardy;A. Roussarie;J.-P. Schuller;J.G. Ashman;C.N. Booth;F. Combley;M. Dinsdale;J. Martin;D. Parker;L.F. Thompson;S. Brandt;H. Burkhardt;C. Grupen;H. Meinhard;E. Neugebauer;U. Schäfer;H. Seywerd;B. Gobbo;F. Liello;E. Millotti;F. Ragusa;L. Rolandi;L. Bellantoni;J.F. Boudreau;D. Cinabro;J.S. Conway;D.F. Cowen;Z. Feng;J.L. Harton;J. Hilgart;R.C. Jared;R.P. Johnson;B.W. Leclaire;Y.B. Pan;T. Parker;J.R. Pater;Y. Saadi;V. Sharma;J.A. Wear;F.V. Weber; Sau Lan Wu;S.T. Xue;G. Zobernig
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