The four-jet final state is analyzed to search for hadronic decays of pair-produced heavy particles. The analysis uses the ALEPH data collected at LEP in November 1995 at centre-of-mass energies of 130 and 136 GeV, corresponding to a total integrated luminosity of 5.7 pb−1. An excess of four-jet events is observed with respect to the standard model predictions. In addition, these events exhibit an enhancement in the sum of the two di-jet masses around 105 GeV/c 2. The properties of these events are studied and compared to the expectations from standard processes and to pair production hypotheses.

Four-jet final state production in e+e− collisions at centre-of-mass energies of 130 and 136 GeV / D. Buskulic;I. Bonis;D. Decamp;P. Ghez;C. Goy;J. P. Lees;A. Lucotte;M. N. Minard;P. Odier;B. Pietrzyk;M. P. Casado;M. Chmeissani;J. M. Crespo;M. Delfino;I. Efthymiopoulos;E. Fernandez;M. Fernandez-Bosman;Ll. Garrido;A. Juste;M. Martinez;S. Orteu;C. Padilla;A. Pascual;J. A. Perlas;I. Riu;F. Sanchez;F. Teubert;A. Colaleo;D. Creanza;M. Palma;G. Gelao;M. Girone;G. Iaselli;G. Maggi;M. Maggi;N. Marinelli;S. Nuzzo;A. Ranieri;G. Raso;F. Ruggieri;G. Selvaggi;L. Silvestris;P. Tempesta;G. Zito;X. Huang;J. Lin;Q. Ouyang;T. Wang;Y. Xie;R. Xu;S. Xue;J. Zhang;L. Zhang;W. Zhao;R. Alemany;A. O. Bazarko;M. Cattaneo;P. Comas;P. Coyle;H. Drevermann;R. W. Forty;M. Frank;R. Hagelberg;J. Harvey;P. Janot;B. Jost;E. Kneringer;J. Knobloch;I. Lehraus;G. Lutters;E. B. Martin;P. Mato;A. Minten;R. Miquel;Ll. M. Mir;L. Moneta;T. Oest;A. Pacheco;J. F. Pusztaszeri;F. Ranjard;P. Rensing;L. Rolandi;D. Schlatter;M. Schmelling;O. Schneider;W. Tejessy;I. R. Tomalin;A. Venturi;H. Wachsmuth;A. Wagner;Z. Ajaltouni;A. Barrès;C. Boyer;A. Falvard;P. Gay;C. Guicheney;P. Henrard;J. Jousset;B. Michel;S. Monteil;J. C. Montret;D. Pallin;P. Perret;F. Podlyski;J. Proriol;P. Rosnet;J. M. Rossignol;T. Fearnley;J. B. Hansen;J. D. Hansen;J. R. Hansen;P. H. Hansen;B. S. Nilsson;A. Wäänänen;A. Kyriakis;C. Markou;E. Simopoulou;I. Siotis;A. Vayaki;K. Zachariadou;A. Blondel;J. C. Brient;A. Rougé;M. Rumpf;A. Valassi;H. Videau;E. Focardi;G. Parrini;M. Corden;C. Georgiopoulos;D. E. Jaffe;A. Antonelli;G. Bencivenni;G. Bologna;F. Bossi;P. Campana;G. Capon;D. Casper;V. Chiarella;G. Felici;P. Laurelli;G. Mannocchi;F. Murtas;G. P. Murtas;L. Passalacqua;M. Pepe-Altarelli;L. Curtis;S. J. Dorris;A. W. Halley;I. G. Knowles;J. G. Lynch;V. O’Shea;C. Raine;P. Reeves;J. M. Scarr;K. Smith;A. S. Thompson;F. Thomson;S. Thorn;R. M. Turnbull;U. Becker;C. Geweniger;G. Graefe;P. Hanke;G. Hansper;V. Hepp;E. E. Kluge;A. Putzer;B. Rensch;M. Schmidt;J. Sommer;H. Stenzel;K. Tittel;S. Werner;M. Wunsch;D. Abbaneo;R. Beuselinck;D. M. Binnie;W. Cameron;P. J. Dornan;A. Moutoussi;J. Nash;J. K. Sedgbeer;A. M. Stacey;M. D. Williams;G. Dissertori;P. Girtler;D. Kuhn;G. Rudolph;A. P. Betteridge;C. K. Bowdery;P. Colrain;G. Crawford;A. J. Finch;F. Foster;G. Hughes;T. Sloan;E. P. Whelan;M. I. Williams;A. Galla;A. M. Greene;C. Hoffmann;K. Kleinknecht;G. Quast;B. Renk;E. Rohne;H. G. Sander;P. Gemmeren;C. Zeitnitz;J. J. Aubert;A. M. Bencheikh;C. Benchouk;A. Bonissent;G. Bujosa;D. Calvet;J. Carr;C. Diaconu;N. Konstantinidis;P. Payre;D. Rousseau;M. Talby;A. Sadouki;M. Thulasidas;A. Tilquin;K. Trabelsi;M. Aleppo;F. Ragusa;I. Abt;R. Assmann;C. Bauer;W. Blum;H. Dietl;F. Dydak;G. Ganis;C. Gotzhein;K. Jakobs;H. Kroha;G. Lütjens;G. Lutz;W. Männer;H. G. Moser;R. Richter;A. Rosado-Schlosser;S. Schael;R. Settles;H. Seywerd;R. St. Denis;W. Wiedenmann;G. Wolf;J. Boucrot;O. Callot;A. Cordier;M. Davier;L. Duflot;J. F. Grivaz;Ph. Heusse;A. Höcker;M. Jacquet;D. W. Kim;F. Diberder;J. Lefrançois;A. M. Lutz;I. Nikolic;H. J. Park;I. C. Park;M. H. Schune;S. Simion;J. J. Veillet;I. Videau;D. Zerwas;P. Azzurri;G. Bagliesi;G. Batignain;S. Bettarini;C. Bozzi;G. Calderini;M. Carpinelli;M. A. Ciocci;V. Ciulli;R. Dell’Orso;R. Fantechi;I. Ferrante;A. Giassi;A. Gregorio;F. Ligabue;A. Lusiani;P. S. Marrocchesi;A. Messineo;F. Palla;G. Rizzo;G. Sanguinetti;A. Sciabà;P. Spagnolo;J. Steinberger;R. Tenchini;G. Tonelli;C. Vannini;P. G. Verdini;J. Walsh;G. A. Blair;L. M. Bryant;F. Cerutti;J. T. Chambers;Y. Gao;M. G. Green;T. Medcalf;P. Perrodo;J. A. Strong;J. H. Wimmersperg-Toeller;D. R. Botterill;R. W. Clifft;T. R. Edgecock;S. Haywood;P. Maley;P. R. Norton;J. C. Thompson;A. E. Wright;B. Bloch-Devaux;P. Colas;S. Emery;W. Kozanecki;E. Lançon;M. C. Lemaire;E. Locci;B. Marx;P. Perez;J. Rander;J. F. Renardy;A. Roussarie;J. P. Schuller;J. Schwindling;A. Trabelsi;B. Vallage;S. N. Black;J. H. Dann;R. P. Johnson;H. Y. Kim;A. M. Litke;M. A. McNeil;G. Taylor;C. N. Booth;R. Boswell;C. A. J. Brew;S. Cartwright;F. Combley;A. Koksal;M. Letho;W. M. Newton;J. Reeve;L. F. Thompson;A. Böhrer;S. Brandt;V. Büscher;G. Cowan;C. Grupen;P. Saraiva;L. Smolik;F. Stephan;M. Apollonio;L. Bosisio;R. Marina;G. Giannini;B. Gobbo;G. Musolino;J. Putz;J. Rothberg;S. Wasserbaech;R. W. Williams;S. R. Armstrong;L. Bellantoni;P. Elmer;Z. Feng;D. P. S. Ferguson;Y. S. Gao;S. González;J. Grahl;T. C. Greening;O. J. Hayes;H. Hu;P. A. McNamara;J. M. Nachtman;W. Orejudos;Y. B. Pan;Y. Saadi;M. Schmitt;I. J. Scott;A. M. Walsh;Sau Lan Wu;X. Wu;J. M. Yamartino;M. Zheng;G. Zobernig. - In: ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS. - ISSN 0170-9739. - ELETTRONICO. - 71:(1996), pp. 179-197. [10.1007/BF02906976]

Four-jet final state production in e+e− collisions at centre-of-mass energies of 130 and 136 GeV

FOCARDI, ETTORE;CIULLI, VITALIANO;
1996

Abstract

The four-jet final state is analyzed to search for hadronic decays of pair-produced heavy particles. The analysis uses the ALEPH data collected at LEP in November 1995 at centre-of-mass energies of 130 and 136 GeV, corresponding to a total integrated luminosity of 5.7 pb−1. An excess of four-jet events is observed with respect to the standard model predictions. In addition, these events exhibit an enhancement in the sum of the two di-jet masses around 105 GeV/c 2. The properties of these events are studied and compared to the expectations from standard processes and to pair production hypotheses.
1996
71
179
197
D. Buskulic;I. Bonis;D. Decamp;P. Ghez;C. Goy;J. P. Lees;A. Lucotte;M. N. Minard;P. Odier;B. Pietrzyk;M. P. Casado;M. Chmeissani;J. M. Crespo;M. Delfino;I. Efthymiopoulos;E. Fernandez;M. Fernandez-Bosman;Ll. Garrido;A. Juste;M. Martinez;S. Orteu;C. Padilla;A. Pascual;J. A. Perlas;I. Riu;F. Sanchez;F. Teubert;A. Colaleo;D. Creanza;M. Palma;G. Gelao;M. Girone;G. Iaselli;G. Maggi;M. Maggi;N. Marinelli;S. Nuzzo;A. Ranieri;G. Raso;F. Ruggieri;G. Selvaggi;L. Silvestris;P. Tempesta;G. Zito;X. Huang;J. Lin;Q. Ouyang;T. Wang;Y. Xie;R. Xu;S. Xue;J. Zhang;L. Zhang;W. Zhao;R. Alemany;A. O. Bazarko;M. Cattaneo;P. Comas;P. Coyle;H. Drevermann;R. W. Forty;M. Frank;R. Hagelberg;J. Harvey;P. Janot;B. Jost;E. Kneringer;J. Knobloch;I. Lehraus;G. Lutters;E. B. Martin;P. Mato;A. Minten;R. Miquel;Ll. M. Mir;L. Moneta;T. Oest;A. Pacheco;J. F. Pusztaszeri;F. Ranjard;P. Rensing;L. Rolandi;D. Schlatter;M. Schmelling;O. Schneider;W. Tejessy;I. R. Tomalin;A. Venturi;H. Wachsmuth;A. Wagner;Z. Ajaltouni;A. Barrès;C. Boyer;A. Falvard;P. Gay;C. Guicheney;P. Henrard;J. Jousset;B. Michel;S. Monteil;J. C. Montret;D. Pallin;P. Perret;F. Podlyski;J. Proriol;P. Rosnet;J. M. Rossignol;T. Fearnley;J. B. Hansen;J. D. Hansen;J. R. Hansen;P. H. Hansen;B. S. Nilsson;A. Wäänänen;A. Kyriakis;C. Markou;E. Simopoulou;I. Siotis;A. Vayaki;K. Zachariadou;A. Blondel;J. C. Brient;A. Rougé;M. Rumpf;A. Valassi;H. Videau;E. Focardi;G. Parrini;M. Corden;C. Georgiopoulos;D. E. Jaffe;A. Antonelli;G. Bencivenni;G. Bologna;F. Bossi;P. Campana;G. Capon;D. Casper;V. Chiarella;G. Felici;P. Laurelli;G. Mannocchi;F. Murtas;G. P. Murtas;L. Passalacqua;M. Pepe-Altarelli;L. Curtis;S. J. Dorris;A. W. Halley;I. G. Knowles;J. G. Lynch;V. O’Shea;C. Raine;P. Reeves;J. M. Scarr;K. Smith;A. S. Thompson;F. Thomson;S. Thorn;R. M. Turnbull;U. Becker;C. Geweniger;G. Graefe;P. Hanke;G. Hansper;V. Hepp;E. E. Kluge;A. Putzer;B. Rensch;M. Schmidt;J. Sommer;H. Stenzel;K. Tittel;S. Werner;M. Wunsch;D. Abbaneo;R. Beuselinck;D. M. Binnie;W. Cameron;P. J. Dornan;A. Moutoussi;J. Nash;J. K. Sedgbeer;A. M. Stacey;M. D. Williams;G. Dissertori;P. Girtler;D. Kuhn;G. Rudolph;A. P. Betteridge;C. K. Bowdery;P. Colrain;G. Crawford;A. J. Finch;F. Foster;G. Hughes;T. Sloan;E. P. Whelan;M. I. Williams;A. Galla;A. M. Greene;C. Hoffmann;K. Kleinknecht;G. Quast;B. Renk;E. Rohne;H. G. Sander;P. Gemmeren;C. Zeitnitz;J. J. Aubert;A. M. Bencheikh;C. Benchouk;A. Bonissent;G. Bujosa;D. Calvet;J. Carr;C. Diaconu;N. Konstantinidis;P. Payre;D. Rousseau;M. Talby;A. Sadouki;M. Thulasidas;A. Tilquin;K. Trabelsi;M. Aleppo;F. Ragusa;I. Abt;R. Assmann;C. Bauer;W. Blum;H. Dietl;F. Dydak;G. Ganis;C. Gotzhein;K. Jakobs;H. Kroha;G. Lütjens;G. Lutz;W. Männer;H. G. Moser;R. Richter;A. Rosado-Schlosser;S. Schael;R. Settles;H. Seywerd;R. St. Denis;W. Wiedenmann;G. Wolf;J. Boucrot;O. Callot;A. Cordier;M. Davier;L. Duflot;J. F. Grivaz;Ph. Heusse;A. Höcker;M. Jacquet;D. W. Kim;F. Diberder;J. Lefrançois;A. M. Lutz;I. Nikolic;H. J. Park;I. C. Park;M. H. Schune;S. Simion;J. J. Veillet;I. Videau;D. Zerwas;P. Azzurri;G. Bagliesi;G. Batignain;S. Bettarini;C. Bozzi;G. Calderini;M. Carpinelli;M. A. Ciocci;V. Ciulli;R. Dell’Orso;R. Fantechi;I. Ferrante;A. Giassi;A. Gregorio;F. Ligabue;A. Lusiani;P. S. Marrocchesi;A. Messineo;F. Palla;G. Rizzo;G. Sanguinetti;A. Sciabà;P. Spagnolo;J. Steinberger;R. Tenchini;G. Tonelli;C. Vannini;P. G. Verdini;J. Walsh;G. A. Blair;L. M. Bryant;F. Cerutti;J. T. Chambers;Y. Gao;M. G. Green;T. Medcalf;P. Perrodo;J. A. Strong;J. H. Wimmersperg-Toeller;D. R. Botterill;R. W. Clifft;T. R. Edgecock;S. Haywood;P. Maley;P. R. Norton;J. C. Thompson;A. E. Wright;B. Bloch-Devaux;P. Colas;S. Emery;W. Kozanecki;E. Lançon;M. C. Lemaire;E. Locci;B. Marx;P. Perez;J. Rander;J. F. Renardy;A. Roussarie;J. P. Schuller;J. Schwindling;A. Trabelsi;B. Vallage;S. N. Black;J. H. Dann;R. P. Johnson;H. Y. Kim;A. M. Litke;M. A. McNeil;G. Taylor;C. N. Booth;R. Boswell;C. A. J. Brew;S. Cartwright;F. Combley;A. Koksal;M. Letho;W. M. Newton;J. Reeve;L. F. Thompson;A. Böhrer;S. Brandt;V. Büscher;G. Cowan;C. Grupen;P. Saraiva;L. Smolik;F. Stephan;M. Apollonio;L. Bosisio;R. Marina;G. Giannini;B. Gobbo;G. Musolino;J. Putz;J. Rothberg;S. Wasserbaech;R. W. Williams;S. R. Armstrong;L. Bellantoni;P. Elmer;Z. Feng;D. P. S. Ferguson;Y. S. Gao;S. González;J. Grahl;T. C. Greening;O. J. Hayes;H. Hu;P. A. McNamara;J. M. Nachtman;W. Orejudos;Y. B. Pan;Y. Saadi;M. Schmitt;I. J. Scott;A. M. Walsh;Sau Lan Wu;X. Wu;J. M. Yamartino;M. Zheng;G. Zobernig
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