Measurement of CP-violation asymmetries in D[superscript 0]→K[subscript S][superscript 0]π[superscript +]π[superscript -]
Author(s)
Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Paus, Christoph M. E.
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We report a measurement of time-integrated CP-violation asymmetries in the resonant substructure of the three-body decay D[superscript 0]→K[subscript S][superscript 0]π[superscript +]π[superscript -] using CDF II data corresponding to 6.0 fb[superscript -1] of integrated luminosity from Tevatron pp̅ collisions at √s=1.96 TeV. The charm mesons used in this analysis come from D[superscript *+](2010)→D[superscript 0]π[superscript +] and D[superscript *-](2010)→D̅[superscript 0]π[superscript -], 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[superscript 0] and D̅[superscript 0] Dalitz plots. We find no CP-violation effects and measure an asymmetry of ACP=(-0.05±0.57(stat)±0.54(syst))% for the overall integrated CP-violation asymmetry, consistent with the standard model prediction.
Date issued
2012-08Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Physical Review D
Publisher
American Physical Society
Citation
Aaltonen, T. et al. “Measurement of CP-violation asymmetries in D[superscript 0]→K[subscript S][superscript 0]π[superscript +]π[superscript -].” Physical Review D 86.3 (2012). © 2012 American Physical Society
Version: Final published version
ISSN
1550-7998
1089-4918