Study of $J/\psi$ and $\psi (3686)$ decay to $\Lambda \bar{\Lambda }$ and ${\Sigma }^0{\bar{\Sigma }}^0$ final states

Abstract

Using $1310.6\times 10^6$ $J/\psi$ and $447.9\times 10^6$ $\psi (3686)$ events collected with the BESIII detector at the BEPCII $e^{+}{e}^{-}$ collider, the branching fractions and the angular distributions of $J/\psi$ and $\psi (3686)$ decays to $\Lambda \bar{\Lambda }$ and ${\Sigma }^0{\bar{\Sigma }}^0$ final states are measured. The branching fractions are in agreement with, and much more precise than, the averages of previously published results. The polar angular distributions of $\psi (3686)$ decays are measured for the first time, while those of $J/\psi$ decays are measured with much improved precision. In addition, the ratios of branching fractions $\frac{\mathcal{B}(\psi (3686)\to \Lambda \bar{\Lambda })}{\mathcal{B}(J/\psi \to \Lambda \bar{\Lambda })}$ and $\frac{\mathcal{B}(\psi (3686)\to {\Sigma }^0{\bar{\Sigma }}^0)}{\mathcal{B}(J/\psi \to {\Sigma }^0{\bar{\Sigma }}^0)}$ are determined to test the "12\% rule".

10 pages, 8 figures

References in corpus (6)

• Heavy quarkonium: progress, puzzles, and opportunities
• Determination of the number of $J/\psi$ events with inclusive $J/\psi$ decays
• First Measurements of Timelike Form Factors of the Hyperons, Lambda0, Sigma0, Sigma+, Xi0, Xi-, and Omega-, and Evidence of Diquark Correlations
• Study of $\psi$ decays to the ${\Xi }^{-}{\bar{\Xi }}^{+}$ and $\Sigma (1385{)}^{\mp }\bar{\Sigma }(1385{)}^{\pm }$ final states
• Measurements of psi(2S) decays to octet baryon-antibaryon pairs
• Determination of the total absorption peak in an electromagnetic calorimeter

Cited by in corpus (38)

• STCF Conceptual Design Report: Volume 1 -- Physics & Detector
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• Polarization observables in $e^{+}{e}^{-}$ annihilation to a baryon-antibaryon pair
• Cross section measurements of $e^{+}{e}^{-}\to \omega {\chi }_{c0}$ from $\sqrt{s}=$4.178 to 4.278 GeV
• Hyperon Form Factors & Diquark Correlations
• The electromagnetic form factors of $\Lambda$ hyperon in the vector meson dominance model
• Study of CP violation in hyperon decays at Super Charm-Tau Factories with a polarized electron beam
• Possible structure of the newly found exotic state ${\eta }_1(1855)$
• Strong and electromagnetic amplitudes of the $J/\psi$ decays into baryons and their relative phase
• Observation of $\psi (3686)\to \Xi (1530{)}^{-}\bar{\Xi }(1530{)}^{+}$ and $\Xi (1530{)}^{-}{\bar{\Xi }}^{+}$
• Light baryonium spectrum
• Strong and weak $CP$ tests in sequential decays of polarized ${\Sigma }^0$ hyperons
• CP symmetry tests in the cascade-anticascade decay of charmonium
• Production and decay of polarized hyperon-antihyperon pairs
• Study of $e^{+}{e}^{-}\to {\Sigma }^0\overline{\Sigma }{}^0$ and ${\Sigma }^{+}\overline{\Sigma }{}^{-}$ by Initial State Radiation Method at Belle
• Measurements of the branching fractions of $\psi (3686)\to {\bar{\Sigma }}^0\Lambda +c.c.$ and ${\chi }_{cJ(J=0,1,2)}\to \Lambda \bar{\Lambda }$
• Impact of the interference between the resonance and continuum amplitudes on vector quarkonia decay branching fraction measurements
• Semileptonic decays of spin-entangled baryon-antibaryon pairs
• Measurement of $\psi (3686)\to \Lambda \bar{\Lambda }\eta$ and $\psi (3686)\to \Lambda \bar{\Lambda }{\pi }^0$ decays
• Search for $\psi (3686)\to \gamma {\eta }_c(\eta (1405))\to \gamma {\pi }^{+}{\pi }^{-}{\pi }^0$
• Polarization difference between hyperons and anti-hyperons induced by external magnetic field
• Sequential hyperon decays in the reaction $e^{+}{e}^{-}\to {\Sigma }^0{\bar{\Sigma }}^0$
• A model to explain angular distributions of $J/\psi$ and $\psi (2S)$ decays into $\Lambda \overline{\Lambda }$ and ${\Sigma }^0{\overline{\Sigma }}^0$
• The electromagnetic form factors of ${\Lambda }_c$ hyperon in the vector meson dominance model
• The effective radius for production of baryon-antibaryon pairs from $\psi$ decays
• Amplitudes separation and strong-electromagnetic relative phase in the $\psi (2S)$ decays into baryons
• The electromagnetic form factors of $\Lambda$ hyperon in $e^{+}{e}^{-}\to \bar{\Lambda }\Lambda$
• Symmetry analysis of charmonium two-body decay
• Baryon decays $J/\psi \to B\bar{B}$ within the QCD factorisation framework
• Isospin violating decays of vector charmonia
• Fully strange tetraquark states via QCD sum rules
• Observation of $\psi (3686)\to \gamma \eta (1405)$ via $\eta (1405)\to f_0(980){\pi }^0$
• Search for the isospin-violating decays ${\mathbf{\chi }}_{\mathbf{cJ}}\to \mathbf{\Lambda }{\bar{\mathbf{\Sigma }}}^0+\mathbf{c}.\mathbf{c}.$ and ${\mathbf{\eta }}_{\mathbf{c}}\to \mathbf{\Lambda }{\bar{\mathbf{\Sigma }}}^0+\mathbf{c}.\mathbf{c}.$
• Amplitude analysis and branching fraction measurement of $J/\psi \to \Lambda {\bar{\Sigma }}^0\eta +c.c$
• Spin polarization of $\Lambda$ hyperons in $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }$ at BESIII
• Remarks on the analysis of the reaction $e^{+}{e}^{-}\to {\Sigma }^0{\bar{\Sigma }}^0$
• A description of charmonia decays $J/\psi \to B\bar{B}$ within the QCD factorisation framework