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Digital archive of theses discussed at the University of Pisa

 

Thesis etd-11292012-172943


Thesis type
Tesi di dottorato di ricerca
Author
CASAROSA, GIULIA
URN
etd-11292012-172943
Thesis title
Measurement of Mixing and CP Violation in the Two-Body D0 decays to KK, pipi and Kpi with the BaBar Experiment
Academic discipline
FIS/01
Course of study
FISICA
Supervisors
tutor Prof. Forti, Francesco
Keywords
  • Standard Model Charm Mixing CP Violation BaBar
Graduation session start date
03/12/2012
Availability
Full
Summary
We present a measurement of D0-D0bar mixing and CP violation using the ratio of lifetimes simultaneously extracted from a sample of D0 mesons produced through the flavor-tagged process D*+ -> D0 pi+, where D0 decays to D0->Kpi, KK, or pipi, along with the untagged decays D0 -> Kpi and D0 -> KK. The lifetimes of the CP-even, Cabibbo-suppressed modes KK and pipi are compared to that of the CP-mixed mode Kpi in order to measure yCP and DeltaY.
We obtain yCP = [0.72 +/- 0.18 (stat) +/- 0.12 (syst)]% and DeltaY = [0.09 +/- 0.26 (stat) +/- 0.06 (syst)]%, where DeltaY constrains possible CP violation. The yCP result excludes the null mixing hypothesis at 3.3 sigma significance. This analysis is based on an integrated luminosity of 468 fb^{-1} collected with the Babar, detector at the PEP-II asymmetric-energy e+e- collider.
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