Measurement of CP-violating asymmetries in B[superscript 0]→(ρπ)[superscript 0] decays using a time-dependent Dalitz plot analysis
Name
Lees_Measurement-of-CP-violating.pdf
Size
1.15 MB
Format
Adobe PDF
Checksum (MD5)
b39feb364243ad3d93bc491aff5f404d
Author(s)
Sciolla, Gabriella
Cowan, Ray F
Dujmic, Denis
Date Issued
July 2013
Journal
Physical Review D
Publisher
American Physical Society
Citation
Lees, J. P., V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, B. Stugu, et al. “Measurement of CP-violating asymmetries in B^{0}→(ρπ)^{0} decays using a time-dependent Dalitz plot analysis.” Physical Review D 88, no. 1 (July 2013). © 2013 American Physical Society
Version
Final published version
Abstract
We present results for a time-dependent Dalitz plot measurement of CP-violating asymmetries in the mode B[superscript 0]→π[superscript +]π[superscript -]π[superscript 0]. The data set is derived from the complete sample of 471×10[superscript 6] BB̅ meson pairs collected with the BABAR detector at the PEP-II asymmetric-energy e[superscript +]e[superscript -] collider at the SLAC National Accelerator Laboratory operating on the Υ(4S) resonance. We extract parameters describing the time-dependent B[superscript 0]→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 B[superscript 0]→ρ[superscript ±]π[superscript ∓] decays, finding the change in χ[superscript 2] between the minimum and the origin (corresponding to no direct CP violation) to be Δχ[superscript 2]=6.42. We present information on the CP-violating parameter α in a likelihood scan that incorporates B[superscript ±]→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.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevD.88.012003
