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

Abstract : 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.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00131073
Contributor : Dominique Girod <>
Submitted on : Thursday, February 15, 2007 - 9:25:12 AM
Last modification on : Wednesday, September 16, 2020 - 4:19:59 PM

Citation

B. Aubert, M. Bona, D. Boutigny, Y. Karyotakis, J.P. Lees, et al.. Measurement of CP Asymmetry in $B^0 \to K^0_s \pi^0 \pi^0$ Decays. Physical Review D, American Physical Society, 2007, 76, pp.071101. ⟨10.1103/PhysRevD.76.071101⟩. ⟨in2p3-00131073⟩

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