Measurements of Lifetimes and a Limit on the Lifetime Difference in the NeutralD-Meson System
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1999
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Abstract
Using the large hadroproduced charm sample collected in experiment E791 at Fermilab, we report the first directly measured constraint on the decay-width difference ΔΓ for the mass eigenstates of the D0- D¯0 system. We obtain our result from lifetime measurements of the decays D0→K−π+ and D0→K−K+, under the assumption of CP invariance, which implies that the CP eigenstates and the mass eigenstates are the same. The lifetime of D0→K−K+ (the CP-even final state) is τKK=0.410±0.011±0.006ps, and the lifetime of D0→K−π+ (an equal mixture of CP-odd and CP-even final states) is τKπ=0.413±0.003±0.004ps. The decay-width difference is ΔΓ=2(ΓKK−ΓKπ)=0.04±0.14±0.05ps−1. We relate these measurements to measurements of mixing in the neutral D-meson system.| Reference Key |
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| Authors | E. M. Aitala,S. Amato,J. C. Anjos,J. A. Appel,D. Ashery,S. Banerjee,I. Bediaga,G. Blaylock,S. B. Bracker,P. R. Burchat,R. A. Burnstein,T. Carter,H. S. Carvalho,N. K. Copty,L. M. Cremaldi,C. Darling,K. Denisenko,A. Fernandez,G. F. Fox,P. Gagnon,C. Gobel,K. Gounder,A. M. Halling,G. Herrera,G. Hurvits,C. James,P. A. Kasper,S. Kwan,D. C. Langs,J. Leslie,B. Lundberg,S. MayTal-Beck,B. Meadows,J. R. T. De Mello Neto,D. Mihalcea,R. H. Milburn,J. M. de Miranda,A. Napier,A. Nguyen,A. B. D'Oliveira,K. O'Shaughnessy,K. C. Peng,L. P. Perera,M. V. Purohit,B. Quinn,S. Radeztsky,A. Rafatian,N. W. Reay,J. J. Reidy,A. C. dos Reis,H. A. Rubin,D. A. Sanders,A. K. S. Santha,A. F. S. Santoro,A. J. Schwartz,M. Sheaff,R. A. Sidwell,A. J. Slaughter,M. D. Sokoloff,J. Solano,N. R. Stanton,R. J. Stefanski,K. Stenson,D. J. Summers,S. Takach,K. Thorne,A. K. Tripathi,S. Watanabe,R. Weiss-Babai,J. Wiener,N. Witchey,E. Wolin,S. M. Yang,D. Yi,S. Yoshida,R. Zaliznyak,C. Zhang;E. M. Aitala;S. Amato;J. C. Anjos;J. A. Appel;D. Ashery;S. Banerjee;I. Bediaga;G. Blaylock;S. B. Bracker;P. R. Burchat;R. A. Burnstein;T. Carter;H. S. Carvalho;N. K. Copty;L. M. Cremaldi;C. Darling;K. Denisenko;A. Fernandez;G. F. Fox;P. Gagnon;C. Gobel;K. Gounder;A. M. Halling;G. Herrera;G. Hurvits;C. James;P. A. Kasper;S. Kwan;D. C. Langs;J. Leslie;B. Lundberg;S. MayTal-Beck;B. Meadows;J. R. T. De Mello Neto;D. Mihalcea;R. H. Milburn;J. M. de Miranda;A. Napier;A. Nguyen;A. B. D'Oliveira;K. O'Shaughnessy;K. C. Peng;L. P. Perera;M. V. Purohit;B. Quinn;S. Radeztsky;A. Rafatian;N. W. Reay;J. J. Reidy;A. C. dos Reis;H. A. Rubin;D. A. Sanders;A. K. S. Santha;A. F. S. Santoro;A. J. Schwartz;M. Sheaff;R. A. Sidwell;A. J. Slaughter;M. D. Sokoloff;J. Solano;N. R. Stanton;R. J. Stefanski;K. Stenson;D. J. Summers;S. Takach;K. Thorne;A. K. Tripathi;S. Watanabe;R. Weiss-Babai;J. Wiener;N. Witchey;E. Wolin;S. M. Yang;D. Yi;S. Yoshida;R. Zaliznyak;C. Zhang; |
| Journal | physical review letters |
| Year | 1999 |
| DOI | 10.1103/physrevlett.83.32 |
| URL | |
| Keywords |
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