Measurement of CP-violation asymmetries in D0 to Ks pi+ pi-

Journal article

We report a measurement of time-integrated CP-violation asymmetries in the resonant substructure of the three-body decay D0 to Ks pi+ pi- using CDF II data corresponding to 6.0 invfb of integrated luminosity from Tevatron ppbar collisions at sqrt(s) = 1.96 TeV. The charm mesons used in this analysis come from D*+(2010) to D0 pi+ and D*-(2010) to D0bar pi-, 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 D0 and D0bar 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.

Authors: Collaboration, CDF; Aaltonen, T; Gonzalez, B; Amerio, S; Amidei, D

• Publication status: Published
• Journal: Phys. Rev. D
• Volume: 86
• Issue: 3
• Pages: 032007
• Publication date: 2012-07-03
• DOI: 10.1103/PhysRevD.86.032007
• EISSN: 1550-2368
• ISSN: 1550-7998
• Language: English
• Keywords: hep-ex