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Measurement of CP asymmetries and branching fractions in charmless two-body B-meson decays to pions and kaons
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BaBar Collaboration (Including: Gershon, T. J., Harrison, P. F., Latham, Thomas and Puccio, E. M. T.). (2013) Measurement of CP asymmetries and branching fractions in charmless two-body B-meson decays to pions and kaons. Physical Review D (Particles, Fields, Gravitation and Cosmology), Volume 87 (Number 5). doi:10.1103/PhysRevD.87.052009 ISSN 1550-7998.
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Official URL: http://dx.doi.org/10.1103/PhysRevD.87.052009
Abstract
We present improved measurements of CP-violation parameters in the decays B0→π+π-, B0→K+π-, and B0→π0π0, and of the branching fractions for B0→π0π0 and B0→K0π0. The results are obtained with the full data set collected at the Υ(4S) resonance by the BABAR experiment at the PEP-II asymmetric-energy B factory at the SLAC National Accelerator Laboratory, corresponding to (467±5)×106 BB̅ pairs. We find the CP-violation parameter values and branching fractions: Sπ+π-=-0.68±0.10±0.03, Cπ+π-=-0.25±0.08±0.02, AK-π+=-0.107±0.016-0.004+0.006, Cπ0π0=-0.43±0.26±0.05, B(B0→π0π0)=(1.83±0.21±0.13)×10-6, B(B0→K0π0)= (10.1±0.6±0.4)×10-6, where in each case, the first uncertainties are statistical and the second are systematic. We observe CP violation with a significance of 6.7 standard deviations for B0→π+π- and 6.1 standard deviations for B0→K+π-, including systematic uncertainties. Constraints on the unitarity triangle angle α are determined from the isospin relations among the B→ππ rates and asymmetries. Considering only the solution preferred by the Standard Model, we find α to be in the range [71°,109°] at the 68% confidence level.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Physical Review D (Particles, Fields, Gravitation and Cosmology) | ||||
| Publisher: | American Physical Society | ||||
| ISSN: | 1550-7998 | ||||
| Official Date: | 6 March 2013 | ||||
| Dates: |
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| Volume: | Volume 87 | ||||
| Number: | Number 5 | ||||
| DOI: | 10.1103/PhysRevD.87.052009 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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