Time-dependent Dalitz-plot analysis of the charmless decay B0 → K0S π+π− at BaBar
Ilić, Jelena (2009) Time-dependent Dalitz-plot analysis of the charmless decay B0 → K0S π+π− at BaBar. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b2260382~S15
A time-dependent amplitude analysis of B0 → K0 Sπ+π− decays is performed in order to extract the CP violation parameters of f0(980)K0 S and ρ0(770)K0 S and direct CP asymmetries of K∗+(892)π−. The results are obtained from the final BABAR data sample of (465 ± 5)106 BB decays, collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. The time dependent CP asymmetry for f0(980)K0 S and ρ0(770)K0 S are measured to be S(f0(980)K0S) = −0.97±0.09±0.01±0.01, and S(ρ0(770)K0S) = 0.67±0.20± 0.06 ± 0.04, respectively. In decays to K∗+(892)π− the direct CP asymmetry is found to be ACP (K∗±(892)π∓) = −0.18 ± 0.10 ± 0.04 ± 0.00. The relative phases between B0 → K∗+(892)π− and B0 → K∗−(892)π+, relevant for the extraction of the unitarity triangle angle γ, is measured to be φ(K∗(892)π) = (34.9 ± 23.1 ± 7.5 ± 4.7)◦, where uncertainties are statistical, systematic and model-dependent, respectively. Fit fractions, direct CP asymemtries and the relative phases of different other resonant modes have also been measured. A new method for extracting longitudinal shower development information from longitudinally unsegmented calorimeters is also presented. This method has been implemented as a part of the BABAR final particle identification algorithm. A significant improvement in low momenta muon identification at BABAR is obtained.
|Item Type:||Thesis or Dissertation (PhD)|
|Subjects:||Q Science > QC Physics|
|Library of Congress Subject Headings (LCSH):||CP violation (Nuclear physics), Symmetry (Physics), Particles (Nuclear physics) -- Charm, Cascade shower|
|Date:||20 February 2009|
|Institution:||University of Warwick|
|Theses Department:||Department of Physics|
|Supervisor(s)/Advisor:||Gershon, Tim ; Harrison, Paul F.|
|Sponsors:||University of Warwick. Dept. of Physics|
|Format of File:|
|Extent:||229 leaves :|
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