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Published August 30, 2011 | Published
Journal Article Open

Search for CP violation using T-odd correlations in D^+ → K^+K^0_S π^+π^- and D^+_s → K^+K^0_S π^+π^- decays


We search for CP violation in a sample of 20 000 Cabibbo-suppressed decays, D^+→K^+K_S^0π^+π^-, and 30 000 Cabibbo-favored decays, D_s^+→K^+K_S^0π^+π^-. We use 520  fb^(-1) of data recorded by the BABAR detector at the PEP-II asymmetric-energy e^+e^- collider operating at center of mass energies near 10.6 GeV. We search for CP violation in the difference between the T-odd asymmetries obtained using triple product correlations of the D^+ (D_s^+) and D^- (D_s^-) decays, respectively. The T violation parameter values obtained are A_T(D^+)=(-12.0±10.0_(stat)±4.6_(syst))×10^(-3) and A_T(D_s^+)=(-13.6±7.7_(stat)±3.4_(syst))×10^(-3), which are consistent with the standard model expectations.

Additional Information

© 2011 American Physical Society. Received 24 May 2011; published 30 August 2011. We are grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues, and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (USA), NSERC (Canada), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MICIIN (Spain), and STFC (United Kingdom). Individuals have received support from the Marie Curie EIF (European Union), the A. P. Sloan Foundation (USA) and the Binational Science Foundation (USA-Israel).

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Published - Lees2011p15796Phys_Rev_D.pdf


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