Study of $\psi (3770)$ decaying to Baryon anti-Baryon Pairs

Abstract

To study the decays of $\psi (3770)$ going to baryon anti-baryon pairs ($B\bar{B}$), all available experiments of measuring the cross sections of $e^{+}{e}^{-}\to B\bar{B}$ at center-of-mass energy ranging from 3.0 GeV to 3.9 GeV are combined. To relate the baryon octets, a model based on the SU(3) flavor symmetry is used and the SU(3) breaking effects are also considered. Assuming the elctric and magnetic form factors are equal ($|G_E|=|G_M|$), a global fit including the interference between the QED process and the resonant process is performed. The branching fraction of $\psi (3770)\to B\bar{B}$ is determined to be $(2.4\pm 0.8\pm 0.3)\times 10^{-5}$, $(1.7\pm 0.6\pm 0.1)\times 10^{-5}$, $(4.5\pm 0.9\pm 0.1)\times 10^{-5}$, $(4.5\pm 0.9\pm 0.1)\times 10^{-5}$, $(2.0\pm 0.7\pm 0.1)\times 10^{-5}$, and $(2.0\pm 0.7\pm 0.1)\times 10^{-5}$ for $B=p,\Lambda ,{\Sigma }^{+},{\Sigma }^0,{\Xi }^{-}$ and ${\Xi }^0$, respectively, where the first uncertainty is from the global fit and the second uncertainty is the systematic uncertainty due to the assumption $|G_E|=|G_M|$. They are at least one order of magnitude larger than a simple scaling of the branching fraction of $J/\psi \to B\bar{B}$.

version accepted by Physics Letters B, revised, discussed added, references added

References in corpus (14)

• Big-Bang Nucleosynthesis
• Precision Measurement of the e+e- --> K+K-(gamma) Cross Section with the Initial-State Radiation Method at BaBar
• Measurements of the cross sections for $e^{+}{e}^{-}\to \mathrm{hadrons}$ at 3.650, 3.6648, 3.773 GeV and the branching fraction for $\psi (3770)\to \mathrm{non}-D\bar{D}$
• Measurements of the braching fractions for psi(3770)--> D0D0-bar,D+D-,DD-bar$ and the resonance parameters of psi(3770) and psi(2S)
• The electromagnetic form factors of the proton in the timelike region
• Measurement of the proton form factor by studying $e^{+}{e}^{-}\to p\bar{p}$
• Nucleon Electromagnetic Form Factors in the Timelike Region
• Measurement of the e+e- --> p anti-p cross section in the energy range from 3.0 to 6.5 GeV
• The puzzle of excessive non-$D\bar{D}$ component of the inclusive $\psi (3770)$ decay and the long-distant contribution
• QCD prediction for the non-$D\bar{D}$ annihilation decay of $\psi (3770)$
• Study of $e^{+}{e}^{-}\to p\bar{p}$ in the vicinity of $\psi (3770)$
• Study of e${}^{+}$e${}^{-}$ $\to \text{p}\overline{\text{p}}{\pi }^0$ in the Vicinity of the $\psi \text{(3770)}$
• Search for Baryonic Decays of ψ(3770) and ψ(4040)
• Evidence for the decay $\psi (3770)\to K^{+}{K}^{-}$

Cited by in corpus (4)

• Measurement of the cross section for $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }$ and evidence of the decay $\psi (3770)\to \Lambda \bar{\Lambda }$
• Measurement of the cross section of $e^{+}{e}^{-}\to {\Xi }^{-}{\bar{\Xi }}^{+}$ at center-of-mass energies between 3.510 and 4.843 GeV
• Measurement of the Born cross section for $e^{+}{e}^{-}\to p{K}^{-}{K}^{-}{\bar{\Xi }}^{+}$ at $\sqrt{s}=$ 3.5-4.9 GeV
• Analytical formula for the cross section of hadron production from $e^{+}{e}^{-}$ collisions around the narrow charmouinum resonances