中文

Observation of $\Lambda_c^+ \to \Lambda^0 K^+$, $\Lambda_c^+ \to \Sigma^0 K^+$ and $\Lambda_c^+ \to \Sigma^+ K^+\pi^-$ decays

高能物理 - 实验 2007-05-23 v1
作者: K. Abe
在 arXiv 上查看 ↗ PDF ↗

摘要

We present measurements of the Cabibbo-suppressed decays Λc+→Λ0K+\Lambda_c^+ \to \Lambda^0 K^+ and Λc+→Σ0K+\Lambda_c^+ \to \Sigma^0 K^+ (both first observations), Λc+→Σ+K+π−\Lambda_c^+ \to \Sigma^+ K^+\pi^- (seen with large statistics for the first time), Λc+→pK+K−\Lambda_c^+ \to p K^+ K^- and Λc+→pϕ\Lambda_c^+ \to p \phi (measured with improved accuracy). Improved branching ratio measurements for the decays Λc+→Σ0K+K−\Lambda_c^+ \to \Sigma^0 K^+ K^- and Λc+→Σ0ϕ\Lambda_c^+ \to \Sigma^0 \phi, which are attributed to W-exchange diagrams, are shown. We also present the first evidence for Λc+→Ξ(1690)K+\Lambda_c^+ \to \Xi(1690) K^+ and set an upper limit on non-resonant Λc+→Σ0K+K−\Lambda_c^+ \to \Sigma^0 K^+ K^- decay. This analysis was performed using 23.6 fb−1^{-1} of data collected by the Belle detector at the e+e−e^+ e^- asymmetric collider KEKB.

关键词

belle experiment dalitz plot analysis branching fraction

引用

@article{arxiv.hep-ex/0108003,
  title  = {Observation of $\Lambda_c^+ \to \Lambda^0 K^+$, $\Lambda_c^+ \to \Sigma^0 K^+$ and $\Lambda_c^+ \to \Sigma^+ K^+\pi^-$ decays},
  author = {K. Abe},
  journal= {arXiv preprint arXiv:hep-ex/0108003},
  year   = {2007}
}

备注

Paper submitted to the 2001 Lepton Photon Conference

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