Measurement of CP-violation asymmetries in $$D^0 \to K_S \pi^+ \pi^-$$
We report a measurement of time-integrated CP-violation asymmetries in the resonant substructure of the three-body decay D{sup 0} {yields} K{sub s}{sup 0}{pi}{sup +}{pi}{sup -} using CDF II data corresponding to 6.0 fb{sup -1} of integrated luminosity from Tevatron p{bar p} collisions at {radical}s=1.96 TeV. The charm mesons used in this analysis come from D*{sup +}(2010){yields}D*{sup -}{pi}{sup +} and D*-(2010){yields}{bar D}{sup 0}{pi}{sup -}, where the production flavor of the charm meson is determined by the charge of the accompanying pion. We apply a Dalitz-amplitude analysis for the description of the dynamic decay structure and use two complementary approaches, namely a full Dalitz-plot fit employing the isobar model for the contributing resonances and a model-independent bin-by-bin comparison of the D{sup 0} and {bar D}{sup -}{sup 0} Dalitz plots. We find no CP-violation effects and measure an asymmetry of A{sub CP}=(-0.05 {+-}0.57(stat){+-}0.54(syst))% for the overall integrated CP-violation asymmetry, CP-violation asymmetry, consistent with the standard model prediction.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1049396
- Report Number(s):
- FERMILAB-PUB-12-339-E; arXiv eprint number arXiv:1207.0825; TRN: US1204820
- Journal Information:
- Physical Review. D, Condensed Matter and Materials Physics, Vol. 86; ISSN 1550-7998
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
CHARMED MESONS
COLLISIONS
CP INVARIANCE
DALITZ PLOT
DATA
DECAY
DYNAMICS
FERMILAB COLLIDER DETECTOR
FERMILAB TEVATRON
FLAVOR
FORECASTING
ISOBAR MODEL
LUMINOSITY
MESONS
PRODUCTION
PROTON-ANTIPROTON INTERACTIONS
STANDARD MODEL
THREE-BODY PROBLEM
Experiment-HEP