Observation of $\Xi (1530{)}^0$ Polarization and Determination of Its Electric and Magnetic Moments in $\psi (3686)\to \Xi (1530{)}^0\bar{\Xi }(1530{)}^0$

Abstract

Using the data sample of $2.7\times 10^9$ $\psi (3686)$ events collected with the BESIII detector at the BEPCII collider, we present an observation of the $\Xi (1530{)}^0$ polarization in the decay $\psi (3686)\to \Xi (1530{)}^0\bar{\Xi }(1530{)}^0$ with a significance larger than $20\sigma$ compared with all other tested hypotheses. The helicity amplitudes for the process $\psi (3686)\to \Xi (1530{)}^0\bar{\Xi }(1530{)}^0$ and the moduli of form factors including electric charge, magnetic dipole, electric quadrupole, and magnetic octupole are measured for the first time by performing an angular distribution analysis. Additionally, the polarization correlations between $\Xi (1530{)}^0$ and $\bar{\Xi }(1530{)}^0$ are measured.

arXiv comment10 pages, 4 figures, consistent with the publication in Physical Review Letters

References in corpus (39)

• Design and Construction of the BESIII Detector
• Coherent Exclusive Exponentiation For Precision Monte Carlo Calculations
• The Spin Structure of the Nucleon
• Charge Density of the Neutron
• The Proton Radius Puzzle
• Dispersion analysis of the nucleon form factors including meson continua
• Weak phases and CP-symmetry tests in sequential decays of entangled double-strange baryons
• Nucleon Electromagnetic Form Factors in the Timelike Region
• Precise Measurements of Decay Parameters and $CP$ Asymmetry with Entangled $\Lambda -\bar{\Lambda }$ Pairs
• Polarization observables in $e^{+}{e}^{-}$ annihilation to a baryon-antibaryon pair
• Nucleon electromagnetic form factors and polarization observables in space-like and time-like regions
• Delta-baryon electromagnetic form factors in lattice QCD
• ${\Sigma }^{+}$ and ${\bar{\Sigma }}^{-}$ polarization in the $J/\psi$ and $\psi (3686)$ decays
• Hyperon Form Factors & Diquark Correlations
• First Measurements of Timelike Form Factors of the Hyperons, Lambda0, Sigma0, Sigma+, Xi0, Xi-, and Omega-, and Evidence of Diquark Correlations
• Determination of the number of $\psi (3686)$ events taken at BESIII
• The electromagnetic form factors of the Omega in lattice QCD
• Observation of ${\Xi }^{-}$ Hyperon Transverse Polarization in $\psi (3686)\to {\Xi }^{-}{\bar{\Xi }}^{+}$
• Model independent determination of the spin of the ${\Omega }^{-}$ and its polarization alignment in $\psi (3686)\to {\Omega }^{-}{\bar{\Omega }}^{+}$
• Observation of $\psi (3686)\to \Xi (1530{)}^{-}\bar{\Xi }(1530{)}^{+}$ and $\Xi (1530{)}^{-}{\bar{\Xi }}^{+}$
• Measurement of $\Lambda$ baryon polarization in $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }$ at $\sqrt{s}=3.773$ GeV
• Strong and weak $CP$ tests in sequential decays of polarized ${\Sigma }^0$ hyperons
• First simultaneous measurement of ${\Xi }^0$ and ${\bar{\Xi }}^0$ asymmetry parameters in $\psi (3686)$ decay
• Study of $e^{+}{e}^{-}\to {\Omega }^{-}{\bar{\Omega }}^{+}$ at center-of-mass energies from 3.49 to 3.67 GeV
• The $\Sigma$ and $\Xi$ electromagnetic form factors in the extended vector meson dominance model
• Determination of the ${\Sigma }^{+}$ Timelike Electromagnetic Form Factors
• Measurement of $\Lambda$ transverse polarization in $e^{+}{e}^{-}$ collisions at $\sqrt{s}=3.68-3.71$ GeV
• Observation of $\psi (3686)\to \Xi (1530{)}^0\bar{\Xi }(1530{)}^0$ and $\Xi (1530{)}^0{\bar{\Xi }}^0$
• Inclusive and semi-inclusive production of spin-3/2 hadrons in $e^{+}{e}^{-}$ annihilation
• Helicity Amplitude Analysis of $J/\psi$ and $\psi (2S)\to \Xi (1530)\bar{\Xi }(1530)$
• Spin Density Matrix for ${\Omega }^{-}$ and its Polarization Alignment in $\psi (3686)\to {\Omega }^{-}{\bar{\Omega }}^{+}$
• Novel method to extract the femtometer structure of strange baryons using the vacuum polarization effect
• Measurement of ${\Sigma }^{+}$ transverse polarization in $e^{+}{e}^{-}$ collisions at $\sqrt{s}=3.68-3.71$ GeV
• Partial wave analysis of $\psi (3686)\to \Lambda {\bar{\Sigma }}^0{\pi }^0+c.c.$
• Search for Charmonium(-like) states decaying into the ${\Omega }^{-}{\bar{\Omega }}^{+}$ final states
• Precise Measurement of Matter-Antimatter Asymmetry with Entangled Hyperon Antihyperon Pairs
• Evidence of transverse polarization of ${\Xi }^0$ hyperon in $\psi (3686)\to {\Xi }^0{\bar{\Xi }}^0$
• Observation of Transverse Polarization and Determination of Psionic Form Factors of the $\Lambda$ Hyperon at $\sqrt{s}=3.773$ GeV
• A Review of Hyperon Physics at BESIII Experiment