D-meson lifetimes
نویسندگان
چکیده
منابع مشابه
Phenomenological Analysis of D Meson Lifetimes
The QCD-based operator-product-expansion technique is systematically applied to the study of charmed meson lifetimes. We stress that it is crucial to take into account the momentum of the spectator light quark of charmed mesons, otherwise the destructive Pauli-interference effect in D+ decays will lead to a negative decay width for the D+. We have applied the QCD sum rule approach to estimate t...
متن کاملCalculation of the D and B meson lifetimes
Using the expansions of the heavy meson decay widths in the heavy quark mass and QCD sum rules for estimates of corresponding matrix elements, we calculate the D decay widths and the B lifetime differences. The results for D mesons are in agreement with the data, while it is predicted that [Γ(B) − Γ(B−)]/ΓB ≃ 4% , and the lifetime difference of the B and Bs mesons is even smaller. The role of t...
متن کاملMeasurement of the D0, D+, and Ds+ meson lifetimes.
We report measurements of the lifetimes of the D, D+, and D,+ (F+) mesons produced in e+e collisions at a center-of-mass energy of 29 GeV. The decay vertex distribution in the processes D ~K rr+, D+~E n+n+, and . D+~Prr+ were made using a vertex chamber installed in the High Resolution Spectrometer at the SLAC storage ring PEP. The measured lifetimes are ~ 0=(4.4+1.0%0.6)X10 ' s, w +=(9.2+,'3+1...
متن کاملB-Meson Mixing and Lifetimes
Bd and Bs meson systems play a fundamental role to test and improve our understanding of Standard Model flavor dynamics. The mixing parameters ∆md,s represent important constraints in the unitarity triangle analysis. Their theoretical estimates require non-perturbative calculations of B-meson decay constants and B-parameters; accurate results, recently obtained from the lattice, are reviewed. O...
متن کاملMeasurement of Charmed Meson Lifetimes with Belle
The lifetimes of charmed mesons have been measured using 2.75 fb of data collected with the Belle detector at KEKB. Each candidate is fully reconstructed to identify the flavor of the charmed meson. The lifetimes are measured to be τ(D) = (414.8±3.8±3.4) fs, τ(D) = (1040 −22 ± 18) fs and τ(D + s ) = (479 +17 −16 +6 −8) fs, where the first error is statistical and the second error is systematic....
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1987
ISSN: 0370-2693
DOI: 10.1016/0370-2693(87)90472-2