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Measurement of CP-violating asymmetries in B0→(ρπ)0 decays using a time-dependent Dalitz plot analysis
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BaBar Collaboration (Including: Gershon, T. J., Harrison, P. F. and Latham, Thomas). (2013) Measurement of CP-violating asymmetries in B0→(ρπ)0 decays using a time-dependent Dalitz plot analysis. Physical Review D (Particles, Fields, Gravitation and Cosmology), Volume 88 (Number 7). Article number 012003. doi:doi: 10.5606/tgkdc.dergisi.2013.6683 ISSN 1550-7998.
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Official URL: http://dx.doi.org/10.1103/PhysRevD.88.012003
Abstract
We present results for a time-dependent Dalitz plot measurement of CP-violating asymmetries in the mode B0→π+π -π0. The data set is derived from the complete sample of 471×106 BB̄ meson pairs collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at the SLAC National Accelerator Laboratory operating on the Υ(4S) resonance. We extract parameters describing the time-dependent B0→ρπ decay probabilities and CP asymmetries, including C=0.016±0.059±0.036, ΔC=0.234±0.061±0.048, S=0.053±0.081±0.034, and ΔS=0.054±0.082±0.039, where the uncertainties are statistical and systematic, respectively. We perform a two-dimensional likelihood scan of the direct CP-violation asymmetry parameters for B0→ρ±πâ̂ decays, finding the change in χ2 between the minimum and the origin (corresponding to no direct CP violation) to be Δχ2=6.42. We present information on the CP-violating parameter α in a likelihood scan that incorporates B ±→ρπ measurements. To aid in the interpretation of our results, statistical robustness studies are performed to assess the reliability with which the true values of the physics parameters can be extracted. Significantly, these studies indicate that α cannot be reliably extracted with our current sample size, though the other physics parameters are robustly extracted.
| 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: | 19 July 2013 | ||||||
| Dates: |
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| Volume: | Volume 88 | ||||||
| Number: | Number 7 | ||||||
| Article Number: | Article number 012003 | ||||||
| DOI: | doi: 10.5606/tgkdc.dergisi.2013.6683 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access |
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