English

Measurements of $\Lambda^+_c$ Branching Fractions of Cabibbo-Suppressed Decay Modes

High Energy Physics - Experiment 2007-05-23 v1

Abstract

We have measured the branching fractions of the Cabibbo-suppressed decays Λc+\Lambda^+_c \to Λ0\Lambda^{0} K+K^+ and Λc+\Lambda^+_c \to Σ0\Sigma^0 K+K^+ %(measured with improved accuracy). relative to the Cabibbo-allowed decay modes Λc+\Lambda^+_c \to Λ0\Lambda^{0} π+\pi^+ and Λc+\Lambda^+_c \to Σ0\Sigma^0 π+\pi^+ to be 0.044±0.004(stat.)±0.002(syst.) 0.044 \pm 0.004 (\textnormal{stat.}) \pm 0.002 (\textnormal{syst.}) and 0.040±0.005(stat.)±0.004(syst.) 0.040 \pm 0.005 (\textnormal{stat.}) \pm 0.004 (\textnormal{syst.}), respectively. We also present the first observation of Λc+\Lambda^+_c \to Λ0\Lambda^{0} K+π+πK^+ \pi^+ \pi^- and have measured the branching fraction relative to Λc+\Lambda^+_c \to Λ0\Lambda^{0} π+\pi^+ to be 0.266±0.027(stat.)±0.032(syst.)0.266 \pm 0.027 (\textnormal{stat.}) \pm 0.032 (\textnormal{syst.}). The upper limit of the branching fraction into the decay Λc+\Lambda^+_c \to Σ0\Sigma^0 K+π+πK^+ \pi^+ \pi^- relative to Λc+\Lambda^+_c \to Σ0\Sigma^0 π+\pi^+ has been measured to be %7.6 \times 10^{-4} < 3.9 \times 10^{-2}atthe90 at the 90% confidence level. This analysis was performed using a data sample of %approximately 125 fb^{-1}(integratedluminosity)collectedbythe\babar (integrated luminosity) collected by the \babar detectoratthePEPIIasymmetricenergydetector at the PEP-II asymmetric-energy B$ Factory at the Stanford Linear Accelerator Center. All results presented in this conference contribution are preliminary.

Keywords

Cite

@article{arxiv.hep-ex/0408024,
  title  = {Measurements of $\Lambda^+_c$ Branching Fractions of Cabibbo-Suppressed Decay Modes},
  author = {B. Aubert and BABAR Collaboration},
  journal= {arXiv preprint arXiv:hep-ex/0408024},
  year   = {2007}
}

Comments

16pages, 5figures, contributed to ICHEP2004