In 451 000 hadronic Z0 decays, recorded with the ALEPH detector at LEP, the yields of Λℓ− and Λℓ+ combinations are measured. Semileptonic decays of b baryons result in a signal of 122± 18 (stat.)−23+22 (syst.) Λℓ− combinations. From a fit to the impact parameter distributions of the leptons in the Λℓ− sample, the lifetime of b baryons is measured to be 1.12−0.29+0.32 (stat.) ±0.16 (syst.) ps. References

A measurement of the b baryon lifetime / D. Buskulic;D. Decamp;C. Goy;J.-P. Lees;M.-N. Minard;B. Mours;R. Alemany;F. Ariztizabal;P. Comas;J.M. Crespo;M. Delfino;E. Fernandez;V. Gaitan;Ll. Garrido;A. Pacheco;A. Pascual;D. Creanza;M. de Palma;A. Farilla;G. Iaselli;G. Maggi;M. Maggi;S. Natali;S. Nuzzo;M. Quattromini;A. Ranieri;G. Raso;F. Romano;F. Ruggieri;G. Selvaggi;L. Silvestris;P. Tempesta;G. Zito;H. Hu;D. Huang;X. Huang;J. Lin;J. Lou;C. Qiao;T. Wang;Y. Xie;D. Xu;R. Xu;J. Zhang;W. Zhao;W.B. Atwood;L.A.T. Bauerdick;E. Blucher;G. Bonvicini;F. Bossi;J. Boudreau;T.H. Burnett;H. Drevermann;R.W. Forty;R. Hagelberg;J. Harvey;S. Haywood;J. Hilgart;R. Jacobsen;B. Jost;J. Knobloch;E. Lançon;I. Lehraus;T. Lohse;A. Lusiani;M. Martinez;P. Mato;T. Mattison;H. Meinhard;S. Menary;T. Meyer;A. Minten;R. Miquel;H.-G. Moser;P. Palazzi;J.A. Perlas;J.-F. Pusztaszeri;F. Ranjard;G. Redlinger;L. Rolandi;A. Roth;J. Rothberg;T. Ruan;M. Saich;D. Schlatter;M. Schmelling;F. Sefkow;W. Tejessy;H. Wachsmuth;W. Wiedenmann;T. Wildish;W. Witzeling;J. Wotschack;Z. Ajaltouni;F. Badaud;M. Bardadin-Otwinowska;A.M. Bencheikh;R. El Fellous;A. Falvard;P. Gay;C. Guicheney;P. Henrard;J. Jousset;B. Michel;J.-C. Montret;D. Pallin;P. Perret;B. Pietrzyk;J. Proriol;F. Prulhière;G. Stimpfl;T. Fearnley;J.D. Hansen;J.R. Hansen;P.H. Hansen;R. Møllerud;B.S. Nilsson;I. Efthymiopoulos;A. Kyriakis;E. Simopoulou;A. Vayaki;K. Zachariadou;J. Badier;A. Blondel;G. Bonneaud;J.C. Brient;G. Fouque;S. Orteu;A. Rosowsky;A. Rougé;M. Rumpf;R. Tanaka;M. Verderi;H. Videau;D.J. Candlin;M.I. Parsons;E. Veitch;L. Moneta;G. Parrini;M. Corden;C. Georgiopoulos;M. Ikeda;J. Lannutti;D. Levinthal;M. Mermikides;L. Sawyer;S. Wasserbaech;A. Antonelli;R. Baldini;G. Bencivenni;G. Bologna;P. Campana;G. Capon;F. Cerutti;V. Chiarella;B. D'Ettorre-Piazzoli;G. Felici;P. Laurelli;G. Mannocchi;F. Murtas;G.P. Murtas;L. Passalacqua;M. Pepe-Altarelli;P. Picchi;B. Altoon;O. Boyle;P. Colrain;I. ten Have;J.G. Lynch;W. Maitland;W.T. Morton;C. Raine;J.M. Scarr;K. Smith;A.S. Thompson;R.M. Turnbull;B. Brandl;O. Braun;R. Geiges;C. Geweniger;P. Hanke;V. Hepp;E.E. Kluge;Y. Maumary;A. Putzer;B. Rensch;A. Stahl;K. Tittel;M. Wunsch;A.T. Belk;R. Beuselinck;D.M. Binnie;W. Cameron;M. Cattaneo;D.J. Colling;P.J. Dornan;S. Dugeay;A.M. Greene;J.F. Hassard;N.M. Lieske;J. Nash;S.J. Patton;D.G. Payne;M.J. Phillips;J.K. Sedgbeer;I.R. Tomalin;A.G. Wright;E. Kneringer;D. Kuhn;G. Rudolph;C.K. Bowdery;T.J. Brodbeck;A.J. Finch;F. Foster;G. Hughes;D. Jackson;N.R. Keemer;M. Nuttall;A. Patel;T. Sloan;S.W. Snow;E.P. Whelan;K. Kleinknecht;J. Raab;B. Renk;H.-G. Sander;H. Schmidt;F. Steeg;S.M. Walther;B. Wolf;J.-J. Aubert;C. Benchouk;V. Bernard;A. Bonissent;J. Carr;P. Coyle;J. Drinkard;F. Etienne;S. Papalexiou;P. Payre;Z. Qian;D. Rousseau;P. Schwemling;M. Talby;S. Adlung;C. Bauer;W. Blum;D. Brown;G. Cowan;B. Dehning;H. Dietl;F. Dydak;M. Fernandez-Bosman;M. Frank;A.W. Halley;J. Lauber;G. Lütjens;G. Lutz;W. Männer;R. Richter;H. Rotscheidt;J. Schröder;A.S. Schwarz;R. Settles;H. Seywerd;U. Stierlin;U. Stiegler;R.St. Denis;M. Takashima;J. Thomas;G. Wolf;V. Bertin;J. Boucrot;O. Callot;X. Chen;A. Cordier;M. Davier;J.-F. Grivaz;Ph. Heusse;P. Janot;D.W. Kim;F. Le Diberder;J. Lefrançois;A.-M. Lutz;M.-H. Schune;J.-J. Veillet;I. Videau;Z. Zhang;F. Zomer;D. Abbaneo;S.R. Amendolia;G. Bagliesi;G. Batignani;L. Bosisio;U. Bottigli;C. Bradaschia;M. Carpinelli;M.A. Ciocci;R. Dell'Orso;I. Ferrante;F. Fidecaro;L. Foà;E. Focardi;F. Forti;A. Giassi;M.A. Giorgi;F. Ligabue;E.B. Mannelli;P.S. Marrocchesi;A. Messineo;F. Palla;G. Rizzo;G. Sanguinetti;J. Steinberger;R. Tenchini;G. Tonelli;G. Triggiani;C. Vannini;A. Venturi;P.G. Verdini;J. Walsh;J.M. Carter;M.G. Green;P.V. March;Ll.M. Mir;T. Medcalf;I.S. Quazi;J.A. Strong;L.R. West;D.R. Botterill;R.W. Clifft;T.R. Edgecock;M. Edwards;S.M. Fisher;T.J. Jones;P.R. Norton;D.P. Salmon;J.C. Thompson;B. Bloch-Devaux;P. Colas;H. Duarte;W. Kozanecki;M.C. Lemaire;E. Locci;S. Loucatos;E. Monnier;P. Perez;F. Perrier;J. Rander;J.-F. Renardy;A. Roussarie;J.-P. Schuller;J. Schwindling;D. Si Mohand;B. Vallage;R.P. Johnson;A.M. Litke;G. Taylor;J. Wear;J.G. Ashman;W. Babbage;C.N. Booth;C. Buttar;R.E. Carney;S. Cartwright;F. Combley;F. Hatfield;P. Reeves;L.F. Thompson;E. Barberio;A. Böhrer;S. Brandt;C. Grupen;L. Mirabito;F. Rivera;U. Schäfer;G. Ganis;G. Giannini;B. Gobbo;F. Ragusa;L. Bellantoni;W. Chen;D. Cinabro;J.S. Conway;D.F. Cowen;Z. Feng;D.P.S. Ferguson;Y.S. Gao;J. Grahl;J.L. Harton;R.C. Jared;B.W. LeClaire;C. Lishka;Y.B. Pan;J.R. Pater;Y. Saadi;V. Sharma;M. Schmitt;Z.H. Shi;A.M. Walsh;F.V. Weber;M.H. Whitney;Sau Lan Wu;X. Wu;G. Zobernig. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - ELETTRONICO. - 297:(1992), pp. 449-458. [10.1016/0370-2693(92)91284-G]

A measurement of the b baryon lifetime

FOCARDI, ETTORE;
1992

Abstract

In 451 000 hadronic Z0 decays, recorded with the ALEPH detector at LEP, the yields of Λℓ− and Λℓ+ combinations are measured. Semileptonic decays of b baryons result in a signal of 122± 18 (stat.)−23+22 (syst.) Λℓ− combinations. From a fit to the impact parameter distributions of the leptons in the Λℓ− sample, the lifetime of b baryons is measured to be 1.12−0.29+0.32 (stat.) ±0.16 (syst.) ps. References
297
449
458
D. Buskulic;D. Decamp;C. Goy;J.-P. Lees;M.-N. Minard;B. Mours;R. Alemany;F. Ariztizabal;P. Comas;J.M. Crespo;M. Delfino;E. Fernandez;V. Gaitan;Ll. Garrido;A. Pacheco;A. Pascual;D. Creanza;M. de Palma;A. Farilla;G. Iaselli;G. Maggi;M. Maggi;S. Natali;S. Nuzzo;M. Quattromini;A. Ranieri;G. Raso;F. Romano;F. Ruggieri;G. Selvaggi;L. Silvestris;P. Tempesta;G. Zito;H. Hu;D. Huang;X. Huang;J. Lin;J. Lou;C. Qiao;T. Wang;Y. Xie;D. Xu;R. Xu;J. Zhang;W. Zhao;W.B. Atwood;L.A.T. Bauerdick;E. Blucher;G. Bonvicini;F. Bossi;J. Boudreau;T.H. Burnett;H. Drevermann;R.W. Forty;R. Hagelberg;J. Harvey;S. Haywood;J. Hilgart;R. Jacobsen;B. Jost;J. Knobloch;E. Lançon;I. Lehraus;T. Lohse;A. Lusiani;M. Martinez;P. Mato;T. Mattison;H. Meinhard;S. Menary;T. Meyer;A. Minten;R. Miquel;H.-G. Moser;P. Palazzi;J.A. Perlas;J.-F. Pusztaszeri;F. Ranjard;G. Redlinger;L. Rolandi;A. Roth;J. Rothberg;T. Ruan;M. Saich;D. Schlatter;M. Schmelling;F. Sefkow;W. Tejessy;H. Wachsmuth;W. Wiedenmann;T. Wildish;W. Witzeling;J. Wotschack;Z. Ajaltouni;F. Badaud;M. Bardadin-Otwinowska;A.M. Bencheikh;R. El Fellous;A. Falvard;P. Gay;C. Guicheney;P. Henrard;J. Jousset;B. Michel;J.-C. Montret;D. Pallin;P. Perret;B. Pietrzyk;J. Proriol;F. Prulhière;G. Stimpfl;T. Fearnley;J.D. Hansen;J.R. Hansen;P.H. Hansen;R. Møllerud;B.S. Nilsson;I. Efthymiopoulos;A. Kyriakis;E. Simopoulou;A. Vayaki;K. Zachariadou;J. Badier;A. Blondel;G. Bonneaud;J.C. Brient;G. Fouque;S. Orteu;A. Rosowsky;A. Rougé;M. Rumpf;R. Tanaka;M. Verderi;H. Videau;D.J. Candlin;M.I. Parsons;E. Veitch;L. Moneta;G. Parrini;M. Corden;C. Georgiopoulos;M. Ikeda;J. Lannutti;D. Levinthal;M. Mermikides;L. Sawyer;S. Wasserbaech;A. Antonelli;R. Baldini;G. Bencivenni;G. Bologna;P. Campana;G. Capon;F. Cerutti;V. Chiarella;B. D'Ettorre-Piazzoli;G. Felici;P. Laurelli;G. Mannocchi;F. Murtas;G.P. Murtas;L. Passalacqua;M. Pepe-Altarelli;P. Picchi;B. Altoon;O. Boyle;P. Colrain;I. ten Have;J.G. Lynch;W. Maitland;W.T. Morton;C. Raine;J.M. Scarr;K. Smith;A.S. Thompson;R.M. Turnbull;B. Brandl;O. Braun;R. Geiges;C. Geweniger;P. Hanke;V. Hepp;E.E. Kluge;Y. Maumary;A. Putzer;B. Rensch;A. Stahl;K. Tittel;M. Wunsch;A.T. Belk;R. Beuselinck;D.M. Binnie;W. Cameron;M. Cattaneo;D.J. Colling;P.J. Dornan;S. Dugeay;A.M. Greene;J.F. Hassard;N.M. Lieske;J. Nash;S.J. Patton;D.G. Payne;M.J. Phillips;J.K. Sedgbeer;I.R. Tomalin;A.G. Wright;E. Kneringer;D. Kuhn;G. Rudolph;C.K. Bowdery;T.J. Brodbeck;A.J. Finch;F. Foster;G. Hughes;D. Jackson;N.R. Keemer;M. Nuttall;A. Patel;T. Sloan;S.W. Snow;E.P. Whelan;K. Kleinknecht;J. Raab;B. Renk;H.-G. Sander;H. Schmidt;F. Steeg;S.M. Walther;B. Wolf;J.-J. Aubert;C. Benchouk;V. Bernard;A. Bonissent;J. Carr;P. Coyle;J. Drinkard;F. Etienne;S. Papalexiou;P. Payre;Z. Qian;D. Rousseau;P. Schwemling;M. Talby;S. Adlung;C. Bauer;W. Blum;D. Brown;G. Cowan;B. Dehning;H. Dietl;F. Dydak;M. Fernandez-Bosman;M. Frank;A.W. Halley;J. Lauber;G. Lütjens;G. Lutz;W. Männer;R. Richter;H. Rotscheidt;J. Schröder;A.S. Schwarz;R. Settles;H. Seywerd;U. Stierlin;U. Stiegler;R.St. Denis;M. Takashima;J. Thomas;G. Wolf;V. Bertin;J. Boucrot;O. Callot;X. Chen;A. Cordier;M. Davier;J.-F. Grivaz;Ph. Heusse;P. Janot;D.W. Kim;F. Le Diberder;J. Lefrançois;A.-M. Lutz;M.-H. Schune;J.-J. Veillet;I. Videau;Z. Zhang;F. Zomer;D. Abbaneo;S.R. Amendolia;G. Bagliesi;G. Batignani;L. Bosisio;U. Bottigli;C. Bradaschia;M. Carpinelli;M.A. Ciocci;R. Dell'Orso;I. Ferrante;F. Fidecaro;L. Foà;E. Focardi;F. Forti;A. Giassi;M.A. Giorgi;F. Ligabue;E.B. Mannelli;P.S. Marrocchesi;A. Messineo;F. Palla;G. Rizzo;G. Sanguinetti;J. Steinberger;R. Tenchini;G. Tonelli;G. Triggiani;C. Vannini;A. Venturi;P.G. Verdini;J. Walsh;J.M. Carter;M.G. Green;P.V. March;Ll.M. Mir;T. Medcalf;I.S. Quazi;J.A. Strong;L.R. West;D.R. Botterill;R.W. Clifft;T.R. Edgecock;M. Edwards;S.M. Fisher;T.J. Jones;P.R. Norton;D.P. Salmon;J.C. Thompson;B. Bloch-Devaux;P. Colas;H. Duarte;W. Kozanecki;M.C. Lemaire;E. Locci;S. Loucatos;E. Monnier;P. Perez;F. Perrier;J. Rander;J.-F. Renardy;A. Roussarie;J.-P. Schuller;J. Schwindling;D. Si Mohand;B. Vallage;R.P. Johnson;A.M. Litke;G. Taylor;J. Wear;J.G. Ashman;W. Babbage;C.N. Booth;C. Buttar;R.E. Carney;S. Cartwright;F. Combley;F. Hatfield;P. Reeves;L.F. Thompson;E. Barberio;A. Böhrer;S. Brandt;C. Grupen;L. Mirabito;F. Rivera;U. Schäfer;G. Ganis;G. Giannini;B. Gobbo;F. Ragusa;L. Bellantoni;W. Chen;D. Cinabro;J.S. Conway;D.F. Cowen;Z. Feng;D.P.S. Ferguson;Y.S. Gao;J. Grahl;J.L. Harton;R.C. Jared;B.W. LeClaire;C. Lishka;Y.B. Pan;J.R. Pater;Y. Saadi;V. Sharma;M. Schmitt;Z.H. Shi;A.M. Walsh;F.V. Weber;M.H. Whitney;Sau Lan Wu;X. Wu;G. Zobernig
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