@article{8db1313c819b4abe8f3bcd4ec3da092d,

title = "Measurements of lifetimes and a limit on the lifetime difference in the neutral d-meson system",

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 Delta Gamma for the mass eigenstates of the D0-D0bar system. We obtain our result from lifetime measurements of the decays D0 ⤍ K-pi+ 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 \tau_KK = 0.410 +/- 0.011 +/- 0.006 ps, and the lifetime of D0 ⤍ K-pi+ (an equal mixture of CP-odd and CP-even final states is tau_Kpi = 0.413 +/- 0.003 +/- 0.004 ps. The decay-width difference is Delta Gamma = 2(Gamma_KK - Gamma_Kpi) = 0.04 +/- 0.14 +/- 0.05 ps^-1. We relate these measurements to measurements of mixing in the neutral D-meson system.",

author = "{Fermilab E791 Collaboration} and Aitala, {E. M.} and S. Amato and Anjos, {J. C.} and Appel, {J. A.} and D. Ashery and S. Banerjee and I. Bediaga and G. Blaylock and Bracker, {S. B.} and Burchat, {P. R.} and Burnstein, {R. A.} and T. Carter and Carvalho, {H. S.} and Copty, {N. K.} and Cremaldi, {L. M.} and C. Darling and K. Denisenko and A. Fernandez and Fox, {G. F.} and P. Gagnon and C. Gobel and K. Gounder and Halling, {A. M.} and G. Herrera and G. Hurvits and C. James and Kasper, {P. A.} and S. Kwan and Langs, {D. C.} and J. Leslie and B. Lundberg and {May Tal Beck}, S. and B. Meadows and {De Mello Neto}, {J. R.T.} and D. Mihalcea and Milburn, {R. H.} and {De Miranda}, {J. M.} and A. Napier and A. Nguyen and D{\textquoteright}oliveira, {A. B.} and K. O{\textquoteright}shaughnessy and Peng, {K. C.} and Perera, {L. P.} and Purohit, {M. V.} and B. Quinn and S. Radeztsky and A. Rafatian and Reay, {N. W.} and Reidy, {J. J.} and {Dos Reis}, {A. C.}",

year = "1999",

doi = "10.1103/PhysRevLett.83.32",

language = "אנגלית",

volume = "83",

pages = "32--36",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "1",

}