Measurements of Baryon Pair Decays of ${\chi }_{cJ}$ Mesons

Abstract

Using 106 $\times 10^6$ ${\psi }^{\prime }$ decays collected with the BESIII detector at the BEPCII, three decays of ${\chi }_{cJ}$ ($J=0,1,2$) with baryon pairs ($\llb$, $\ssb$, $\SSB$) in the final state have been studied. The branching fractions are measured to be $\mathcal{B}$$({\chi }_{c0,1,2}\to \Lambda \bar{\Lambda })=(33.3\pm 2.0\pm 2.6)\times 10^{-5}$, $(12.2\pm 1.1\pm 1.1)\times 10^{-5}$, $(20.8\pm 1.6\pm 2.3)\times 10^{-5}$; $\mathcal{B}$$({\chi }_{c0,1,2}\to {\Sigma }^0{\bar{\Sigma }}^0)$ = $(47.8\pm 3.4\pm 3.9)\times 10^{-5}$, $(3.8\pm 1.0\pm 0.5)\times 10^{-5}$, $(4.0\pm 1.1\pm 0.5)\times 10^{-5}$; and $\mathcal{B}$$({\chi }_{c0,1,2}\to {\Sigma }^{+}{\bar{\Sigma }}^{-})$ = $(45.4\pm 4.2\pm 3.0)\times 10^{-5}$, $(5.4\pm 1.5\pm 0.5)\times 10^{-5}$, $(4.9\pm 1.9\pm 0.7)\times 10^{-5}$, where the first error is statistical and the second is systematic. Upper limits on the branching fractions for the decays of ${\chi }_{c1,2}\to {\Sigma }^0{\bar{\Sigma }}^0$, ${\Sigma }^{+}{\bar{\Sigma }}^{-}$, are estimated to be $\mathcal{B}$$({\chi }_{c1}\to {\Sigma }^0{\bar{\Sigma }}^0)<6.2\times 10^{-5}$, $\mathcal{B}$$({\chi }_{c2}\to {\Sigma }^0{\bar{\Sigma }}^0)<6.5\times 10^{-5}$, $\mathcal{B}$$({\chi }_{c1}\to {\Sigma }^{+}{\bar{\Sigma }}^{-})<8.7\times 10^{-5}$ and $\mathcal{B}$$({\chi }_{c2}\to {\Sigma }^{+}{\bar{\Sigma }}^{-})<8.8\times 10^{-5}$ at the 90% confidence level.

arXiv comment13 pages, 7 figures, 3 tables

References in corpus (13)

• Rigorous QCD Analysis of Inclusive Annihilation and Production of Heavy Quarkonium
• Design and Construction of the BESIII Detector
• The Precision Monte Carlo Event Generator KK For Two-Fermion Final States In e+e- Collisions
• Coherent Exclusive Exponentiation For Precision Monte Carlo Calculations
• Study of ${\chi }_{cJ}$ radiative decays into a vector meson
• J/psi and psi(2S) Radiative Transitions to eta_c
• Colour Octet Contribution in Exclusive P-Wave Charmonium Decay into Octet and Decuplet Baryons
• Further study of the helicity selection rule evading mechanism in ${\eta }_c$, ${\chi }_{c0}$ and $h_c$ decaying to baryon anti-baryon pairs
• Measurement of B(J/psi->eta_c gamma) at KEDR
• Bayesian credible interval construction for Poisson statistics
• Exclusive Baryon-Antibaryon Decays of the chi_cJ Mesons
• First Evidence of Lambda Lambda-bar in χ_cJ Decays
• Measurement of chi_cJ Decays to 2(pi^+pi^-)ppbar Final States

Cited by in corpus (19)

• Study of $J/\psi$ and $\psi (3686)\to \Sigma (1385{)}^0\bar{\Sigma }(1385{)}^0$ and ${\Xi }^0{\bar{\Xi }}^0$
• Study of $\psi$ decays to the ${\Xi }^{-}{\bar{\Xi }}^{+}$ and $\Sigma (1385{)}^{\mp }\bar{\Sigma }(1385{)}^{\pm }$ final states
• Measurement of the cross section for $e^{+}{e}^{-}\to {\Xi }^{-}{\bar{\Xi }}^{+}$ and observation of an excited $\Xi$ baryon
• Measurement of cross-section for $e^{+}{e}^{-}\to {\Xi }^{-}{\bar{\Xi }}^{+}$ near threshold at BESIII
• Measurement of cross section for $e^{+}{e}^{-}\to {\Xi }^0{\bar{\Xi }}^0$ near threshold
• Measurement of the cross section for $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }$ and evidence of the decay $\psi (3770)\to \Lambda \bar{\Lambda }$
• Observation of ${\Xi }^{-}$ Hyperon Transverse Polarization in $\psi (3686)\to {\Xi }^{-}{\bar{\Xi }}^{+}$
• 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
• ${\chi }_{c0}(1P)$ decay into $\bar{\Sigma }\Sigma \pi$ in search of an $I=1$, $1/2^{-}$ baryon state around $\bar{K}N$ threshold
• Study of $e^{+}{e}^{-}\to {\Omega }^{-}{\bar{\Omega }}^{+}$ at center-of-mass energies from 3.49 to 3.67 GeV
• Measurement of the cross section of $e^{+}{e}^{-}\to {\Xi }^{-}{\bar{\Xi }}^{+}$ at center-of-mass energies between 3.510 and 4.843 GeV
• Measurements of the branching fractions of $\psi (3686)\to {\bar{\Sigma }}^0\Lambda +c.c.$ and ${\chi }_{cJ(J=0,1,2)}\to \Lambda \bar{\Lambda }$
• Helicity Amplitude Analysis of $J/\psi$ and $\psi (2S)\to \Xi (1530)\bar{\Xi }(1530)$
• First observation of the decay ${\chi }_{cJ}\to {\Sigma }^{+}\bar{p}{K}_S^0+c.c.(J=0,1,2)$
• First Measurements of ${\chi }_{cJ}\to {\Sigma }^{-}{\bar{\Sigma }}^{+}(J=0,1,2)$ Decays
• Improved measurements of ${\chi }_{cJ}\to {\Sigma }^{+}{\bar{\Sigma }}^{-}$ and ${\Sigma }^0{\bar{\Sigma }}^0$ decays
• Helicity amplitude and branching fraction measurement of ${\chi }_{cJ}\to \Lambda \bar{\Lambda }$
• Search for the isospin-violating decays ${\mathbf{\chi }}_{\mathbf{cJ}}\to \mathbf{\Lambda }{\bar{\mathbf{\Sigma }}}^0+\mathbf{c}.\mathbf{c}.$ and ${\mathbf{\eta }}_{\mathbf{c}}\to \mathbf{\Lambda }{\bar{\mathbf{\Sigma }}}^0+\mathbf{c}.\mathbf{c}.$