ALEPH's published measurement of using a lifetime tag is updated using the full LEP 1 data sample. Considerable effort has been devoted to understanding systematic effects. Charm background is better controlled by combining the lifetime tag with a tag based on the hadron mass difference. Furthermore, the algorithm used to reconstruct the event primary vertex is designed so as to reduce correlations between the two hemispheres of an event. The value of Rb is measured to be 0.2167 ± 0.0011(stat) ± 0.0013(syst).

A measurement of Rb using a lifetime-mass tag / R. Barate;D. Buskulic;D. Decamp;P. Ghez;C. Goy;J.-P. Lees;A. Lucotte;M.-N. Minard;J.-Y. Nief;B. Pietrzyk;M.P. Casado;M. Chmeissani;P. Comas;J.M. Crespo;M. Delfino;E. Fernandez;M. Fernandez-Bosman;Ll. Garrido;A. Juste;M. Martinez;R. Miquel;Ll.M. Mir;S. Orteu;C. Padilla;I.C. Park;A. Pascual;J.A. Perlas;I. Riu;F. Sanchez;F. Teubert;A. Colaleo;D. Creanza;M. de Palma;G. Gelao;G. Iaselli;G. Maggi;M. Maggi;N. Marinelli;S. Nuzzo;A. Ranieri;G. Raso;F. Ruggieri;G. Selvaggi;L. Silvestris;P. Tempesta;A. Tricomi;G. Zito;X. Huang;J. Lin;Q. Ouyang;T. Wang;Y. Xie;R. Xu;S. Xue;J. Zhang;L. Zhang;W. Zhao;D. Abbaneo;R. Alemany;U. Becker;A.O. Bazarko;P. Bright-Thomas;M. Cattaneo;F. Cerutti;H. Drevermann;R.W. Forty;M. Frank;R. Hagelberg;J. Harvey;P. Janot;B. Jost;E. Kneringer;J. Knobloch;I. Lehraus;G. Lutters;P. Mato;A. Minten;L. Moneta;A. Pacheco;J.-F. Pusztaszeri;F. Ranjard;P. Rensing;G. Rizzo;L. Rolandi;D. Schlatter;M. Schmitt;O. Schneider;W. Tejessy;I.R. Tomalin;H. Wachsmuth;A. Wagner;Z. Ajaltouni;A. Barrès;C. Boyer;A. Falvard;C. Ferdi;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;B. Rensch;A. Wäänänen;G. Daskalakis;A. Kyriakis;C. Markou;E. Simopoulou;I. Siotis;A. Vayaki;A. Blondel;G. Bonneaud;J.C. Brient;P. Bourdon;A. Rougé;M. Rumpf;A. Valassi;M. Verderi;H. Videau;D.J. Candlin;M.I. Parsons;E. Focardi;G. Parrini;K. Zachariadou;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;J.M. Scarr;K. Smith;P. Teixeira-Dias;A.S. Thompson;E. Thomson;F. Thomson;R.M. Turnbull;C. Geweniger;G. Graefe;P. Hanke;G. Hansper;V. Hepp;E.E. Kluge;A. Putzer;M. Schmidt;J. Sommer;K. Tittel;S. Werner;M. Wunsch;R. Beuselinck;D.M. Binnie;W. Cameron;P.J. Dornan;M. Girone;S. Goodsir;E.B. Martin;A. Moutoussi;J. Nash;J.K. Sedgbeer;A.M. Stacey;M.D. Williams;G. Dissertori;V.M. Ghete;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;M.I. Williams;A. Galla;I. Giehl;A.M. Greene;C. Hoffmann;K. Jakobs;K. Kleinknecht;G. Quast;B. Renk;E. Rohne;H.-G. Sander;P. van Gemmeren;C. Zeitnitz;J.J. Aubert;C. Benchouk;A. Bonissent;G. Bujosa;D. Calvet;J. Carr;P. Coyle;C. Diaconu;F. Etienne;N. Konstantinidis;O. Leroy;F. Motsch;P. Payre;D. Rousseau;M. Talby;A. Sadouki;M. Thulasidas;K. Trabelsi;M. Aleppo;F. Ragusa;R. Berlich;W. Blum;D. Brown;V. Büscher;H. Dietl;F. Dydak;G. Ganis;C. Gotzhein;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;H. Stenzel;W. Wiedenmann;G. Wolf;J. Boucrot;O. Callot;S. Chen;Y. Choi;A. Cordier;M. Davier;L. Duflot;J.-F. Grivaz;Ph. Heusse;A. Höcker;A. Jacholkowska;M. Jacquet;D.W. Kim;F. Le Diberder;J. Lefrançois;A.-M. Lutz;I. Nikolic;M.-H. Schune;S. Simion;E. Tournefier;J.-J. Veillet;I. Videau;D. Zerwas;P. Azzurri;G. Bagliesi;G. Batignani;S. Bettarini;C. Bozzi;G. Calderini;M. Carpinelli;M.A. Ciocci;V. Ciulli;R. Dell'Orso;R. Fantechi;I. Ferrante;L. Foà;F. Forti;A. Giassi;M.A. Giorgi;A. Gregorio;F. Ligabue;A. Lusiani;P.S. Marrocchesi;A. Messineo;F. Palla;G. Sanguinetti;A. Sciabà;P. Spagnolo;J. Steinberger;R. Tenchini;G. Tonelli;C. Vannini;A. Venturi;P.G. Verdini;G.A. Blair;L.M. Bryant;J.T. Chambers;Y. Gao;M.G. Green;T. Medcalf;P. Perrodo;J.A. Strong;J.H. von 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;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;M.S. Kelly;M. Lehto;W.M. Newton;J. Reeve;L.F. Thompson;A. Böhrer;S. Brandt;G. Cowan;C. Grupen;P. Saraiva;L. Smolik;F. Stephan;M. Apollonio;L. Bosisio;R. Della Marina;G. Giannini;B. Gobbo;G. Musolino;J. Rothberg;S. Wasserbaech;S.R. Armstrong;E. Charles;P. Elmer;D.P.S. Ferguson;Y.S. Gao;S. González;T.C. Greening;O.J. Hayes;H. Hu;S. Jin;P.A. McNamara;J.M. Nachtman;J. Nielsen;W. Orejudos;Y.B. Pan;Y. Saadi;I.J. Scott;J. Walsh; Sau Lan Wu;X. Wu;J.M. Yamartino;G. Zobernig. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - ELETTRONICO. - 401:(1997), pp. 150-162. [10.1016/S0370-2693(97)00406-1]

A measurement of Rb using a lifetime-mass tag

FOCARDI, ETTORE;CIULLI, VITALIANO;
1997

Abstract

ALEPH's published measurement of using a lifetime tag is updated using the full LEP 1 data sample. Considerable effort has been devoted to understanding systematic effects. Charm background is better controlled by combining the lifetime tag with a tag based on the hadron mass difference. Furthermore, the algorithm used to reconstruct the event primary vertex is designed so as to reduce correlations between the two hemispheres of an event. The value of Rb is measured to be 0.2167 ± 0.0011(stat) ± 0.0013(syst).
401
150
162
R. Barate;D. Buskulic;D. Decamp;P. Ghez;C. Goy;J.-P. Lees;A. Lucotte;M.-N. Minard;J.-Y. Nief;B. Pietrzyk;M.P. Casado;M. Chmeissani;P. Comas;J.M. Crespo;M. Delfino;E. Fernandez;M. Fernandez-Bosman;Ll. Garrido;A. Juste;M. Martinez;R. Miquel;Ll.M. Mir;S. Orteu;C. Padilla;I.C. Park;A. Pascual;J.A. Perlas;I. Riu;F. Sanchez;F. Teubert;A. Colaleo;D. Creanza;M. de Palma;G. Gelao;G. Iaselli;G. Maggi;M. Maggi;N. Marinelli;S. Nuzzo;A. Ranieri;G. Raso;F. Ruggieri;G. Selvaggi;L. Silvestris;P. Tempesta;A. Tricomi;G. Zito;X. Huang;J. Lin;Q. Ouyang;T. Wang;Y. Xie;R. Xu;S. Xue;J. Zhang;L. Zhang;W. Zhao;D. Abbaneo;R. Alemany;U. Becker;A.O. Bazarko;P. Bright-Thomas;M. Cattaneo;F. Cerutti;H. Drevermann;R.W. Forty;M. Frank;R. Hagelberg;J. Harvey;P. Janot;B. Jost;E. Kneringer;J. Knobloch;I. Lehraus;G. Lutters;P. Mato;A. Minten;L. Moneta;A. Pacheco;J.-F. Pusztaszeri;F. Ranjard;P. Rensing;G. Rizzo;L. Rolandi;D. Schlatter;M. Schmitt;O. Schneider;W. Tejessy;I.R. Tomalin;H. Wachsmuth;A. Wagner;Z. Ajaltouni;A. Barrès;C. Boyer;A. Falvard;C. Ferdi;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;B. Rensch;A. Wäänänen;G. Daskalakis;A. Kyriakis;C. Markou;E. Simopoulou;I. Siotis;A. Vayaki;A. Blondel;G. Bonneaud;J.C. Brient;P. Bourdon;A. Rougé;M. Rumpf;A. Valassi;M. Verderi;H. Videau;D.J. Candlin;M.I. Parsons;E. Focardi;G. Parrini;K. Zachariadou;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;J.M. Scarr;K. Smith;P. Teixeira-Dias;A.S. Thompson;E. Thomson;F. Thomson;R.M. Turnbull;C. Geweniger;G. Graefe;P. Hanke;G. Hansper;V. Hepp;E.E. Kluge;A. Putzer;M. Schmidt;J. Sommer;K. Tittel;S. Werner;M. Wunsch;R. Beuselinck;D.M. Binnie;W. Cameron;P.J. Dornan;M. Girone;S. Goodsir;E.B. Martin;A. Moutoussi;J. Nash;J.K. Sedgbeer;A.M. Stacey;M.D. Williams;G. Dissertori;V.M. Ghete;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;M.I. Williams;A. Galla;I. Giehl;A.M. Greene;C. Hoffmann;K. Jakobs;K. Kleinknecht;G. Quast;B. Renk;E. Rohne;H.-G. Sander;P. van Gemmeren;C. Zeitnitz;J.J. Aubert;C. Benchouk;A. Bonissent;G. Bujosa;D. Calvet;J. Carr;P. Coyle;C. Diaconu;F. Etienne;N. Konstantinidis;O. Leroy;F. Motsch;P. Payre;D. Rousseau;M. Talby;A. Sadouki;M. Thulasidas;K. Trabelsi;M. Aleppo;F. Ragusa;R. Berlich;W. Blum;D. Brown;V. Büscher;H. Dietl;F. Dydak;G. Ganis;C. Gotzhein;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;H. Stenzel;W. Wiedenmann;G. Wolf;J. Boucrot;O. Callot;S. Chen;Y. Choi;A. Cordier;M. Davier;L. Duflot;J.-F. Grivaz;Ph. Heusse;A. Höcker;A. Jacholkowska;M. Jacquet;D.W. Kim;F. Le Diberder;J. Lefrançois;A.-M. Lutz;I. Nikolic;M.-H. Schune;S. Simion;E. Tournefier;J.-J. Veillet;I. Videau;D. Zerwas;P. Azzurri;G. Bagliesi;G. Batignani;S. Bettarini;C. Bozzi;G. Calderini;M. Carpinelli;M.A. Ciocci;V. Ciulli;R. Dell'Orso;R. Fantechi;I. Ferrante;L. Foà;F. Forti;A. Giassi;M.A. Giorgi;A. Gregorio;F. Ligabue;A. Lusiani;P.S. Marrocchesi;A. Messineo;F. Palla;G. Sanguinetti;A. Sciabà;P. Spagnolo;J. Steinberger;R. Tenchini;G. Tonelli;C. Vannini;A. Venturi;P.G. Verdini;G.A. Blair;L.M. Bryant;J.T. Chambers;Y. Gao;M.G. Green;T. Medcalf;P. Perrodo;J.A. Strong;J.H. von 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;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;M.S. Kelly;M. Lehto;W.M. Newton;J. Reeve;L.F. Thompson;A. Böhrer;S. Brandt;G. Cowan;C. Grupen;P. Saraiva;L. Smolik;F. Stephan;M. Apollonio;L. Bosisio;R. Della Marina;G. Giannini;B. Gobbo;G. Musolino;J. Rothberg;S. Wasserbaech;S.R. Armstrong;E. Charles;P. Elmer;D.P.S. Ferguson;Y.S. Gao;S. González;T.C. Greening;O.J. Hayes;H. Hu;S. Jin;P.A. McNamara;J.M. Nachtman;J. Nielsen;W. Orejudos;Y.B. Pan;Y. Saadi;I.J. Scott;J. Walsh; Sau Lan Wu;X. Wu;J.M. Yamartino;G. Zobernig
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