Measurement of branching fractions and search for CP-violating charge asymmetries in charmless two-body B decays into pions and kaons

Journal Article · Tue May 01 04:00:00 EDT 2001 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.87.151802· OSTI ID:841981

Aubert, B ^[1]

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1. LBNL Library

We present measurements of the branching fractions and a search for CP-violating charge asymmetries in charmless hadronic decays of B mesons into two-body final states of kaons and pions. The results are based on a data sample of approximately 23 million BB(bar) pairs collected by the BABAR detector at the PEP-II asymmetric B Factory at SLAC. We find the following branching fractions: BF(B0-->pi+pi-)= (4.1+/-1.0+/-0.7) x 10-6, BF(B0-->K+pi-)=(16.7+/-1.6+/-1.3) x 10-6, BF(B+-->K+pi0)=(10.8+2.1+/-1.9+/-1.0) x 10-6, BF(B+-->K0pi+)=(18.2+3.3+/-3.0+/-2.0) x 10-6, BF(B0-->K0pi0)=(8.2+3.1+/-2.7+/-1.2) x 10-6. We also report the 90 percent confidence level upper limits BF(B0-->K+K-) < 2.5 x 10-6, BF(B+-->pi+pi0) < 9.6 x 10-6, and BF(B+-->anti-K0K+) < 2.4 x 10-6. In addition, charge asymmetries have been measured and found to be consistent with zero, where the statistical precision is in the range of +/-0.10 to +/-0.18, depending on the decay mode.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 841981
• Report Number(s): LBNL--48080; BABAR-PUB-01-10
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 15 Vol. 87; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCURACY
B MESONS
DECAY
KAONS
PIONS
STANFORD LINEAR ACCELERATOR CENTER