English

Recent Results From CLEO on D0-D0Bar Mixing, CP Violation in D0 Decays, and D*+ Width

High Energy Physics - Experiment 2012-08-27 v1

Abstract

We present preliminary results of several analyses searching for the effects of CP violation and mixing in the decay of D0D^0 mesons. We find no evidence of CP asymmetry in five different two-body decay modes of the D0D^0 to pairs of light pseudo-scalar mesons: ACP(K+K)=(+0.05±2.18±0.84)A_{CP}(K^+ K^-) = (+0.05 \pm 2.18 \pm 0.84)% , ACP(π+π)=(+2.0±3.2±0.8)A_{CP}(\pi^+ \pi^-) = (+2.0 \pm 3.2 \pm 0.8)% , ACP(KS0π0)=(+0.1±1.3)A_{CP}(K^0_{\rm S} \pi^0) = (+0.1 \pm 1.3)%, ACP(π0π0)=(+0.1±4.8)A_{CP}(\pi^0 \pi^0) = (+0.1 \pm 4.8)%, and ACP(KS0KS0)=(23±19)A_{CP}(K^0_{\rm S} K^0_{\rm S}) = (-23 \pm 19)%. We present the first measurement of the rate of wrong-sign D0K+ππ0D^0 \to K^+ \pi^- \pi^0 decay: R=0.00430.0010+0.0011±0.0007R = 0.0043^{+0.0011}_{-0.0010} \pm 0.0007. We also describe a measurement of the mixing parameter yCP=ΔΓ2Γy_{CP}= {\Delta\Gamma\over 2 \Gamma} by searching for a lifetime difference between the CP neutral Kπ+K^{-}\pi^{+} final state and the CP even K+KK^+K^- and π+π\pi^+\pi^- final states. Under the assumption that CP is conserved we find yCP=0.011±0.025±0.014y_{CP} = -0.011 \pm 0.025 \pm 0.014. Finally, we present our measurement of the \dstarp width: 96±4±2296 \pm 4 \pm 22~keeV.

Keywords

Cite

@article{arxiv.hep-ex/0104008,
  title  = {Recent Results From CLEO on D0-D0Bar Mixing, CP Violation in D0 Decays, and D*+ Width},
  author = {CLEO Collaboration},
  journal= {arXiv preprint arXiv:hep-ex/0104008},
  year   = {2012}
}

Comments

6 pages, Proceedings of the Fourth International Conference on B Physics & CP Violation