Measurement of the B0 and B− meson lifetimes

قياس أعمار ميزونات B0 و B−

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ID: 267306
2000
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Abstract
The lifetimes of the B0 and B− mesons are measured using a sample of about four million hadronic Z decays collected from 1991 to 1995 with the Aleph detector at LEP. The data sample has been recently reprocessed, achieving a substantial improvement in the tracking performance. Semileptonic decays of B0 and B− mesons are partially reconstructed by identifying events containing a lepton with an associated D★+ or D0 meson. The proper time of the B meson is estimated from the measured decay length and the momentum of the D-lepton system. A fit to the proper time of 1880 D★+ℓ− and 2856 D0ℓ− candidates yields the following results: τB0=1.518±0.053±0.034 ps, τB−=1.648±0.049±0.035 ps, τB−/τB0=1.085±0.059±0.018.
تُقاس أعمار ميزونات B0 و B− باستخدام عينة تضم نحو أربعة ملايين من اضمحلالات Z الهادرونية جُمعت في الفترة بين عامي 1991 و1995 بواسطة كاشف ALEPH في مصادم LEP. وقد أُعيدت معالجة عينة البيانات حديثاً، مما حقق تحسناً ملحوظاً في أداء تتبع المسارات. كما أُعيد بناء الاضمحلالات شبه اللبتونية لميزونات B0 و B− جزئياً عبر تحديد الأحداث التي تحتوي على لبتون مقترن بميزون D★+ أو D0. ويُقدَّر الزمن الخاص لميزون B استناداً إلى طول الاضمحلال المقاس وزخم نظام D-لبتون. ويُعطي توفيق المنحنى للزمن الخاص لـ 1880 مرشحاً من D★+ℓ− و2856 مرشحاً من D0ℓ− النتائج التالية: τB0=1.518±0.053±0.034 ps، و τB−=1.648±0.049±0.035 ps، و τB−/τB0=1.085±0.059±0.018.
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Authors R. Barate,D. Decamp,P. Ghez,C. Goy,J.-P. Lees,E. Merle,M.-N. Minard,B. Pietrzyk,S. Bravo,M.P. Casado,M. Chmeissani,J.M. Crespo,E. Fernandez,M. Fernandez-Bosman,Ll. Garrido,E. Graugés,M. Martinez,G. Merino,R. Miquel,Ll.M. Mir,A. Pacheco,H. Ruiz,A. Colaleo,D. Creanza,M. de Palma,G. Iaselli,G. Maggi,M. Maggi,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,G. Boix,O. Buchmüller,M. Cattaneo,F. Cerutti,G. Dissertori,H. Drevermann,R.W. Forty,M. Frank,T.C. Greening,J.B. Hansen,J. Harvey,P. Janot,B. Jost,I. Lehraus,P. Mato,A. Minten,A. Moutoussi,F. Ranjard,L. Rolandi,D. Schlatter,M. Schmitt,O. Schneider,P. Spagnolo,W. Tejessy,F. Teubert,E. Tournefier,A.E. Wright,Z. Ajaltouni,F. Badaud,G. Chazelle,O. Deschamps,A. Falvard,P. Gay,C. Guicheney,P. Henrard,J. Jousset,B. Michel,S. Monteil,J.-C. Montret,D. Pallin,P. Perret,F. Podlyski,P.H. Hansen,B.S. Nilsson,A. Wäänänen,G. Daskalakis,A. Kyriakis,C. Markou,E. Simopoulou,A. Vayaki,A. Blondel,G. Bonneaud,J.-C. Brient,A. Rougé,M. Rumpf,M. Swynghedauw,M. Verderi,H. Videau,E. Focardi,G. Parrini,K. Zachariadou,A. Antonelli,G. Bencivenni,G. Bologna,F. Bossi,P. Campana,G. Capon,V. Chiarella,P. Laurelli,G. Mannocchi,F. Murtas,G.P. Murtas,L. Passalacqua,M. Pepe-Altarelli,A.W. Halley,J.G. Lynch,P. Negus,V. O'Shea,C. Raine,P. Teixeira-Dias,A.S. Thompson,R. Cavanaugh,S. Dhamotharan,C. Geweniger,P. Hanke,G. Hansper,V. Hepp,E.E. Kluge,A. Putzer,J. Sommer,K. Tittel,S. Werner,M. Wunsch,R. Beuselinck,D.M. Binnie,W. Cameron,P.J. Dornan,M. Girone,N. Marinelli,J.K. Sedgbeer,J.C. Thompson,E. Thomson,V.M. Ghete,P. Girtler,E. Kneringer,D. Kuhn,G. Rudolph,C.K. Bowdery,P.G. Buck,A.J. Finch,F. Foster,G. Hughes,R.W.L. Jones,N.A. Robertson,I. Giehl,K. Jakobs,K. Kleinknecht,G. Quast,B. Renk,E. Rohne,H.-G. Sander,H. Wachsmuth,C. Zeitnitz,A. Bonissent,J. Carr,P. Coyle,O. Leroy,P. Payre,D. Rousseau,M. Talby,M. Aleppo,F. Ragusa,H. Dietl,G. Ganis,A. Heister,K. Hüttmann,G. Lütjens,C. Mannert,W. Männer,H.-G. Moser,S. Schael,R. Settles,H. Stenzel,W. Wiedenmann,G. Wolf,P. Azzurri,J. Boucrot,O. Callot,S. Chen,A. Cordier,M. Davier,L. Duflot,J.-F. Grivaz,Ph. Heusse,A. Jacholkowska,F. Le Diberder,J. Lefrançois,A.-M. Lutz,M.-H. Schune,J.-J. Veillet,I. Videau,C. Yuan,D. Zerwas,G. Bagliesi,T. Boccali,G. Calderini,V. Ciulli,L. Foà,A. Giassi,F. Ligabue,A. Messineo,F. Palla,G. Rizzo,G. Sanguinetti,A. Sciabà,G. Sguazzoni,R. Tenchini,A. Venturi,P.G. Verdini,G.A. Blair,G.;R. Barate;D. Decamp;P. Ghez;C. Goy;J.-P. Lees;E. Merle;M.-N. Minard;B. Pietrzyk;S. Bravo;M.P. Casado;M. Chmeissani;J.M. Crespo;E. Fernandez;M. Fernandez-Bosman;Ll. Garrido;E. Graugés;M. Martinez;G. Merino;R. Miquel;Ll.M. Mir;A. Pacheco;H. Ruiz;A. Colaleo;D. Creanza;M. de Palma;G. Iaselli;G. Maggi;M. Maggi;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;G. Boix;O. Buchmüller;M. Cattaneo;F. Cerutti;G. Dissertori;H. Drevermann;R.W. Forty;M. Frank;T.C. Greening;J.B. Hansen;J. Harvey;P. Janot;B. Jost;I. Lehraus;P. Mato;A. Minten;A. Moutoussi;F. Ranjard;L. Rolandi;D. Schlatter;M. Schmitt;O. Schneider;P. Spagnolo;W. Tejessy;F. Teubert;E. Tournefier;A.E. Wright;Z. Ajaltouni;F. Badaud;G. Chazelle;O. Deschamps;A. Falvard;P. Gay;C. Guicheney;P. Henrard;J. Jousset;B. Michel;S. Monteil;J.-C. Montret;D. Pallin;P. Perret;F. Podlyski;P.H. Hansen;B.S. Nilsson;A. Wäänänen;G. Daskalakis;A. Kyriakis;C. Markou;E. Simopoulou;A. Vayaki;A. Blondel;G. Bonneaud;J.-C. Brient;A. Rougé;M. Rumpf;M. Swynghedauw;M. Verderi;H. Videau;E. Focardi;G. Parrini;K. Zachariadou;A. Antonelli;G. Bencivenni;G. Bologna;F. Bossi;P. Campana;G. Capon;V. Chiarella;P. Laurelli;G. Mannocchi;F. Murtas;G.P. Murtas;L. Passalacqua;M. Pepe-Altarelli;A.W. Halley;J.G. Lynch;P. Negus;V. O'Shea;C. Raine;P. Teixeira-Dias;A.S. Thompson;R. Cavanaugh;S. Dhamotharan;C. Geweniger;P. Hanke;G. Hansper;V. Hepp;E.E. Kluge;A. Putzer;J. Sommer;K. Tittel;S. Werner;M. Wunsch;R. Beuselinck;D.M. Binnie;W. Cameron;P.J. Dornan;M. Girone;N. Marinelli;J.K. Sedgbeer;J.C. Thompson;E. Thomson;V.M. Ghete;P. Girtler;E. Kneringer;D. Kuhn;G. Rudolph;C.K. Bowdery;P.G. Buck;A.J. Finch;F. Foster;G. Hughes;R.W.L. Jones;N.A. Robertson;I. Giehl;K. Jakobs;K. Kleinknecht;G. Quast;B. Renk;E. Rohne;H.-G. Sander;H. Wachsmuth;C. Zeitnitz;A. Bonissent;J. Carr;P. Coyle;O. Leroy;P. Payre;D. Rousseau;M. Talby;M. Aleppo;F. Ragusa;H. Dietl;G. Ganis;A. Heister;K. Hüttmann;G. Lütjens;C. Mannert;W. Männer;H.-G. Moser;S. Schael;R. Settles;H. Stenzel;W. Wiedenmann;G. Wolf;P. Azzurri;J. Boucrot;O. Callot;S. Chen;A. Cordier;M. Davier;L. Duflot;J.-F. Grivaz;Ph. Heusse;A. Jacholkowska;F. Le Diberder;J. Lefrançois;A.-M. Lutz;M.-H. Schune;J.-J. Veillet;I. Videau;C. Yuan;D. Zerwas;G. Bagliesi;T. Boccali;G. Calderini;V. Ciulli;L. Foà;A. Giassi;F. Ligabue;A. Messineo;F. Palla;G. Rizzo;G. Sanguinetti;A. Sciabà;G. Sguazzoni;R. Tenchini;A. Venturi;P.G. Verdini;G.A. Blair;G.;
Journal physics letters b
Year 2000
DOI
10.1016/s0370-2693(00)01093-5
URL
https://sciprofiles.com/publication/view/542a1887f17fd513f3e7ca111d8ad177
Keywords
lep substantial meson reprocessed τb0 partially

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