Study of CP-violating asymmetries in B^0 --> pi^+pi^-, K^+pi^- decays

Abstract

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

8 pages, 2 figrues, submitted to Physical Review D (rapid communications)