MEASUREMENTS OF BRANCHING FRACTIONS AND CP VIOLATING ASYMMETRIES IN B0 ---> PI+ PI-, K+ PI-, K+ K- DECAYS
- SLAC
We present measurements of branching fractions and CP-violating asymmetries for neutral B meson decays to two-body final states of charged pions and kaons. The results are obtained from a data sample of about 88 million {Upsilon}(4S) {yields} B{bar B} decays collected between 1999 and 2002 with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. From a time-independent fit we measure the charge-averaged branching fractions {Beta}(B{sup 0} {yields} {pi}{sup +} {pi}{sup -}) = (4.7 {+-} 0.6 {+-} 0.2) x 10{sup -6} and {Beta}(B{sup 0} {yields} K{sup +}{pi}{sup -}) = (17.9 {+-} 0.9 {+-} 0.7) x 10{sup -6}, where the first uncertainty is statistical and the second is systematic; the 90% confidence level upper limit {Beta}(B{sup 0} {yields} K{sup +}K{sup -}) < 0.6 x 10{sup -6}; and the direct CP-violating charge asymmetry A{sub K{pi}} = -0.102 {+-} 0.050 {+-} 0.016 [-0.188, -0.016], where the range in square brackets indicates the 90% confidence interval. We measure the CP-violating parameters in B{sup 0} {yields} {pi}{sup +}{pi}{sup -} decays with a time-dependent fit and find S{sub {pi}{pi}} = 0.02 {+-} 0.34 {+-} 0.05 [-0.54, +0.58] and C{sub {pi}{pi}} = -0.30 {+-} 0.25 {+-} 0.04 [-0.72, +0.12].
- Research Organization:
- Stanford Linear Accelerator Center, Menlo Park, CA (US)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC03-76SF00515;
- OSTI ID:
- 799967
- Report Number(s):
- SLAC-PUB-9317
- Country of Publication:
- United States
- Language:
- English
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