Measurement of D0-antiD0 mixing parameters using D0 ---> K(S)0 pi+ pi- and D0 ---> K(S)0 K+ K- decays

del Amo Sanchez, P.; Lees, J.P.; Poireau, V.; Prencipe, E.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Martinelli, M.; Palano, A.; Pappagallo, M.

doi:10.1103/PhysRevLett.105.081803

Measurement of D0-antiD0 mixing parameters using D0 ---> K(S)0 pi+ pi- and D0 ---> K(S)0 K+ K- decays

BaBar

Collaboration

Apr, 2010

7 pages

Published in:

Phys.Rev.Lett. 105 (2010) 081803

e-Print:

1004.5053 [hep-ex]

DOI:

10.1103/PhysRevLett.105.081803

PDG:

\vert{}{\mathit m}_{{{\mathit D}_{{{1}}}^{0}}}-{\mathit m}_{{{\mathit D}_{{{2}}}^{0}}}\vert{}

=

x

\Gamma

Report number:

BABAR-PUB-10-004,
SLAC-PUB-14087

Experiments:

SLAC-PEP2-BABAR

View in:

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reference search178 citations

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Abstract: (arXiv)

We report a direct measurement of

D^0-overline{D}^0

mixing parameters through a time-dependent amplitude analysis of the Dalitz plots of

D^0 \rightarrow K_S^0 \pi^+ \pi^-

and, for the first time,

D^0 \rightarrow K_S^0 K^+ K^-

decays. The low-momentum pion

\pi_s^+

in the decay

D^{*+} \rightarrow D^0 \pi_s^+

identifies the flavor of the neutral

D

meson at its production. Using 468.5 fb

^{-1}

of

e^+e^-

colliding-beam data recorded near

\sqrt s = 10.6

~GeV by the BABAR detector at the PEP-II asymmetric-energy collider at SLAC, we measure the mixing parameters

x= [1.6 \pm 2.3 ({\rm stat.}) \pm 1.2 ({\rm syst.}) \pm 0.8 ({\rm model}) ] \times10^{-3}

, and

y= [5.7 \pm 2.0 ({\rm stat.}) \pm 1.3 ({\rm syst.}) \pm 0.7 ({\rm model}) ]\times 10^{-3}

. These results provide the best measurement to date of

x

and

y

. The knowledge of the value of

x

, in particular, is crucial for understanding the origin of mixing.

Note:

7 pages, 3 postscript figures, supplementary material. Accepted by Phys. Rev. Lett

13.25.Ft
11.30.Er
12.15.Ff
14.40.Lb
electron positron: annihilation
D*(2010): hadronic decay
D0: hadronic decay
particle identification: flavor
D0 anti-D0: mixing: measured
BaBar

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