Study of CP-violating asymmetries in $B^0 \to \pi^+\pi^-, K^+\pi^-$ decays

Abstract : We present a measurement of the time-dependent CP-violating asymmetries in neutral B decays to the $\pi^+\pi^-$ CP eigenstate, and an updated measurement of the charge asymmetry in $B^0\to K^+\pi^-$ decays. In a sample of 33 million $\Upsilon(4S)\to B\bar B$ decays collected with the BABAR detector at the SLAC PEP-II asymmetric $B$ Factory, we find $65^{+12}_{-11}$ $\pi^+\pi^-$ and $217\pm 18$ $K^+\pi^-$ candidates and measure the asymmetry parameters $S_{\pi\pi} = 0.03^{+0.53}_{-0.56}\pm 0.11$, $C_{\pi\pi} = -0.25^{+0.45}_{-0.47}\pm 0.14$, and ${\cal A}_{K\pi} = -0.07 \pm 0.08 \pm 0.02$, where the first error is statistical and the second is systematic.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00011447
Contributor : Claudine Bombar <>
Submitted on : Tuesday, April 16, 2002 - 4:44:42 PM
Last modification on : Wednesday, January 6, 2021 - 6:22:02 PM

Citation

B. Aubert, D. Boutigny, J.M. Gaillard, A. Hicheur, Y. Karyotakis, et al.. Study of CP-violating asymmetries in $B^0 \to \pi^+\pi^-, K^+\pi^-$ decays. Physical Review D, American Physical Society, 2002, 65, pp.051502. ⟨in2p3-00011447⟩

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