Measurement of $D^0$ - $\bar{D}^0$ mixing using the ratio of lifetimes for the decays $D^0 \to K^{-} \pi^{+}$, $K^{-} K^{+}$, and $\pi^{-} \pi^{+}$

Aubert, Bernard; Bona, M.; Karyotakis, Y.; Lees, J.P.; Poireau, V.; Prudent, X.; Tisserand, V.; Zghiche, A.; Garra Tico, J.; Grauges, E.

doi:10.1103/PhysRevD.78.011105

Measurement of $D^0$ - $\bar{D}^0$ mixing using the ratio of lifetimes for the decays $D^0 \to K^{-} \pi^{+}$ , $K^{-} K^{+}$ , and $\pi^{-} \pi^{+}$

BaBar

Collaboration

Dec, 2007

8 pages

Published in:

Phys.Rev.D 78 (2008) 011105

e-Print:

0712.2249 [hep-ex]

DOI:

10.1103/PhysRevD.78.011105

PDG: A

_{\Gamma }

Report number:

SLAC-PUB-13047,
BABAR-PUB-07-068

Experiments:

SLAC-PEP2-BABAR

View in:

pdf

reference search123 citations

Citations per year

Abstract: (arXiv)

We present a measurement of

D^0

-

\bar{D^0}

mixing parameters using the ratios of lifetimes extracted from a sample of

D^0

mesons produced through the process D^{*+}\to\D^0\pi^+, that decay to

K^{+}\pi^{-}

, K^{-}K^{+}

, or

\pi^-\pi^+

. The Cabibbo-suppressed modes

K^{-}K^{+}

and

\pi^-\pi^+

are compared to the Cabibbo-favored mode

K^{+}\pi^{-}

to obtain a measurement of

y_{CP}

, which in the limit of CP conservation corresponds to the mixing parameter

y

. The analysis is based on a data sample of 384

fb^{-1}

collected by the

BaBar

detector at the PEP-II asymmetric-energy

e^+e^-

collider. We obtain

y_{CP} = [1.24\pm 0.39\mathrm{(stat)} \pm 0.13\mathrm{(syst)}]%

, which is evidence of

D^0

-

\bar{D^0}

mixing at the

3\sigma

level, and

\Delta Y = [-0.26\pm 0.36\mathrm{(stat)} \pm 0.08 \mathrm{(syst)}]%

, where

\Delta Y

constrains possible CP violation. Combining this result with a previous

BaBar

measurement of

y_{CP}

obtained from a separate sample of

D^0\to K^{-}K^{+}

events, we obtain

y_{CP} = [1.03\pm 0.33 \mathrm{(stat)} \pm 0.19 \mathrm{(syst)}]%$.

Note:

8 pages, 9 postscript figures, submitted to PRD-RC

12.15.Ff
11.30.Er
13.25.Ft
electron positron: colliding beams
electron positron: annihilation
charmed meson: electroproduction
D*(2010): hadronic decay
D0: hadronic decay
meson: pair production
K

References(23)

Figures(0)

Evidence for $D^{\,0} - \overline{D}^{\,0}$ Mixing

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(
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)
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)
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Limits on $D^0 \bar{D}^0$ mixing and CP violation from the ratio of lifetimes for decay to $K^- \pi^+$ , $K^- K^+$ and $\pi^- \pi^+$

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)

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Measurement of D0D^0D0 - Dˉ0\bar{D}^0Dˉ0 mixing using the ratio of lifetimes for the decays D0→K−π+D^0 \to K^{-} \pi^{+}D0→K−π+, K−K+K^{-} K^{+}K−K+, and π−π+\pi^{-} \pi^{+}π−π+

Citations per year

Measurement of $D^0$ - $\bar{D}^0$ mixing using the ratio of lifetimes for the decays $D^0 \to K^{-} \pi^{+}$ , $K^{-} K^{+}$ , and $\pi^{-} \pi^{+}$