Evidence forD0−D¯0Mixing Using the CDF II Detector

Abstract

We measure the time dependence of the ratio of decay rates for the rare decay D{0}-->K{+}pi{-} to the Cabibbo-favored decay D{0}-->K{-}pi;{+}. A signal of 12.7x10;{3} D{0}-->K{+}pi{-} decays was obtained using the Collider Detector at Fermilab II detector at the Fermilab Tevatron with an integrated luminosity of 1.5 fb;{-1}. We measure the D0-D[over ]{0} mixing parameters (R_{D},y{'},x{'2}), and find that the data are inconsistent with the no-mixing hypothesis with a probability equivalent to 3.8 Gaussian standard deviations.

Precision measurements of Direct CP violation and D0-D0bar mixing at CDF

“…In the absence of mixing, x = y = 0 and R(t/τ) = R D . CDF published a measurement based on an integrated luminosity of 1.5 f b −1 and achieved sensitivities of ±0.35×10 −3 and ±7.6×10 −3 on the mixing parameters x 2 and y , respectively [3].The current data sample, corresponding to 5.2 f b −1 , has approximately twice as much signal, as seen in Fig. 2.…”

Measurement of D⁰ - $\bar{D}$⁰ Mixing With a Time-Dependent Amplitude Analysis of D⁰ → K⁺π^- π⁰

“…The first in the study of the D 0 → K + π − decays, the latter in a lifetime ratio analysis. Later, also the CDF collaboration claimed an evidence in the same channel as BABAR [16]. BABAR also claimed the evidence of mixing in a lifetime ratio [14] and in a time-dependent amplitude analysis of D 0 → K + π − π 0 [15].…”

“…In the general case, 16) where k n are constants. Unless there is a unique k such that k n = k for all n, then there is a phase shift between Af andĀf .…”

Measurement of the CP violating phase β_s in B⁰_s J/ΨΦ decays

“…44) This implies that the weak eigenstates are not exact CP eigenstates, and that there is a small fraction of indirect CP violation in this system. system has only recently been observed by the BaBar [36] and CDF [37] collaborations. This is a very small effect, and its observation relies on the highly accurate flavour tagging of the initial state which is achievable from knowledge of the D 0 meson production process.…”

“…• 68% CL (1σ confidence region): 2∆ log L = 3.50 • 95% CL (2σ confidence region): 2∆ log L = 5. 37 The values of these levels for the Gaussian case were given in Section 7.2.1…”