Measurement of CP Asymmetry in $B^0 \to K_s \pi^0 \pi^0$ Decays

We present a measurement of the time-dependent CP asymmetry for the neutral B-meson decay into the CP = +1 final state Ks pi0 pi0, with Ks -> pi+ pi-. We use a sample of approximately 227 million B-meson pairs recorded at the Upsilon(4S) resonance with the BABAR detector at the PEP-II B-Factory at SLAC. From an unbinned maximum likelihood fit we extract the mixing-induced CP-violation parameter S = 0.72 +/- 0.71 +/- 0.08 and the direct CP-violation parameter C = 0.23 +/- 0.52 +/- 0.13, where the first uncertainty is statistical and the second systematic.

Note:

8 pages, 6 figures, submitted to Phys. Rev. D (Rapid Communications) Report-no: SLAC-PUB-12335, BABAR-PUB 06/068

12.15.Hh
11.30.Er
13.25.Hw
electron positron: colliding beams
electron positron: annihilation
Upsilon(10570): electroproduction
B: pair production
B0: hadronic decay
K0(S)
pi0: pair production

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