Measurement of masses and branching ratios of ${\Xi }_c^{+}$ and ${\Xi }_c^0$ baryons

Abstract

We report a measurement of the ${\Xi }_c^{+}$ and ${\Xi }_c^0$ baryon masses, and the branching ratios for various ${\Xi }_c$ decays, using $140{\mathrm{fb}}^{-1}$ of data collected by the Belle experiment at the KEKB $e^{+}{e}^{-}$ collider.The mass splitting $m_{{\Xi }_c^0}-m_{{\Xi }_c^{+}}$ is found to be $2.9\pm 0.5\mathrm{MeV}/c^2$; this measurement is three times as precise as the current world average. We measure the branching ratios $\Gamma ({\Xi }_c^{+}\to \Lambda K\pi \pi )/\Gamma ({\Xi }_c^{+}\to \Xi \pi \pi )=0.32\pm 0.03\pm 0.02$ and $\Gamma ({\Xi }_c^0\to pKK\pi )/\Gamma ({\Xi }_c^0\to \Xi \pi )=0.33\pm 0.03\pm 0.03$, with improved precision, and measure $\Gamma ({\Xi }_c^{+}\to p{K}_S^0{K}_S^0)/\Gamma ({\Xi }_c^{+}\to \Xi \pi \pi )=0.087\pm 0.016\pm 0.014$, $\Gamma ({\Xi }_c^0\to \Lambda K\pi )/\Gamma ({\Xi }_c^0\to \Xi \pi )=1.07\pm 0.12\pm 0.07$ and $\Gamma ({\Xi }_c^0\to \Lambda K_S^0)/\Gamma ({\Xi }_c^0\to \Xi \pi )=0.21\pm 0.02\pm 0.02$ for the first time. In ${\Xi }_c^0$ decays to the $p{K}^{-}{K}^{-}{\pi }^{+}$ final state, we find evidence for the process ${\Xi }_c^0\to p{K}^{-}\bar{K}{}^{\ast }(892{)}^0$ and measure the fraction of decays via this process to be $0.51\pm 0.03\pm 0.01$.

16 pages, 9 figures, LaTeX, submitted to Phys. Lett. B

References in corpus (4)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Measurements of ${\Xi }_c^{+}$ Branching Ratios
• Measurement of the relative branching ratio BR(Ξ_c^+ \to p^+ K^-π^+)\BR(Ξ_c^+ \to Ξ^- π^+ π^+)
• Measurement of the Decay Rate of Xi_c^0 --> pK^-K^-pi^+ Relative to Xi_c^0 --> Xi^-pi^+

Cited by in corpus (8)

• The Physics of the B Factories
• First measurements of absolute branching fractions of ${\Xi }_c^0$ at Belle
• Measurement of masses of the ${\Xi }_c(2645)$ and ${\Xi }_c(2815)$ baryons and observation of ${\Xi }_c(2980)\to {\Xi }_c(2645)\pi$ %and observation of the ${\Xi }_c(2980)$ and observation of ${\Xi }_c(2980)\to {\Xi }_c(2645)\pi$
• Observation of B^+ -> \barΞ_c^0Λ_c^+ and Evidence for B^0 -> \barΞ_c^-Λ_c^+
• Measurements of the branching fractions of ${\Xi }_c^0\to \Lambda K_S^0$, ${\Xi }_c^0\to {\Sigma }^0{K}_S^0$, and ${\Xi }_c^0\to {\Sigma }^{+}{K}^{-}$ decays at Belle
• Measurement of the ${\Lambda }_c^{+}$ lifetime
• First Observation of Cabibbo-Suppressed Ξ_c^0 Decays
• A Primary Study of Heavy Baryons Lambda_Q, Xi_Q, Sigma_Q and Omega_Q