Measurement of CP--violating asymmetries in $D^0\to\pi^+\pi^-$ and $D^0\to K^+K^-$ decays at CDF - INSPIRE

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Measurement of CP--violating asymmetries in $D^0\to\pi^+\pi^-$ and $D^0\to K^+K^-$ decays at CDF

CDF

Collaboration

Nov, 2011

29 pages

Published in:

Phys.Rev.D 85 (2012) 012009

e-Print:

1111.5023 [hep-ex]

DOI:

10.1103/PhysRevD.85.012009

PDG:

\mathit A_{\mathit CP}({{\mathit K}^{+}}{{\mathit K}^{-}}

{{\mathit D}^{0}}

{{\overline{\mathit D}}^{0}}

\rightarrow

{{\mathit K}^{+}}{{\mathit K}^{-}}

Report number:

FERMILAB-PUB-11-624-PPD

Experiments:

FNAL-E-0830

View in:

reference search158 citations

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Abstract: (arXiv)

We report on a measurement of CP-violating asymmetries (Acp) in the Cabibbo-suppressed D0 --> pi+ pi- and D0 --> K+K- decays reconstructed in a data sample corresponding to 5.9 fb-1 of integrated luminosity collected by the upgraded Collider Detector at Fermilab. We use the strong decay D*+ --> D0 pi+ to identify the flavor of the charmed meson at production and exploit CP-conserving strong c-cbar pair-production in p-pbar collisions. High-statistics samples of Cabibbo-favored D0 --> K- p+ decays with and without a D* tag are used to correct for instrumental effects and significantly reduce systematic uncertainties. We measure Acp(D0 --> pi+ pi-) = (+0.22 +- 0.24 (stat) +- 0.11 (syst))% and Acp(D 0 --> K+ K-) = (-0.24 +- 0.22 (stat) +- 0.09 (syst))%, in agreement with CP conservation. These are the most precise determinations from a single experiment to date. Under the assumption of negligible direct CP violation in D0 --> pi+ pi- and D0 --> K+K- decays, the results provide an upper limit to the CP-violating asymmetry in D0 mixing, |Acp^{ind}(D0)|< 0.13% at the 90% confidence level.

Note:

29 pages, 20 figures, 3 tables. Submitted to Phys. Rev. D

14.40.Lb
13.25.Ft
anti-p p: interaction
D*(2010)+: hadronic decay
particle identification: flavor
D0: hadronic decay
pi: pair production
K: pair production
CP: violation
asymmetry: CP: measured

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