Measurements of psi'-> pbar K+ sigma0 and chi_cj->pbar K+ Lambda

Abstract

Using a sample of $1.06\times 10^8$ ${\psi }^{\prime }$ mesons collected with the BESIII detector at the BEPCII $e^{+}{e}^{-}$ collider and ${\chi }_{cJ}$ mesons produced via radiative transitions from the ${\psi }^{\prime }$, we report the first observation for ${\psi }^{\prime }\to \bar{p}{K}^{+}{\Sigma }^0+c.c.$ (charge-conjugate), as well as improved measurements for the ${\chi }_{cJ}$ hyperon decays ${\chi }_{cJ}\to \bar{p}{K}^{+}\Lambda +c.c.$. The branching fractions are measured to be $\mathcal{B}({\psi }^{\prime }\to \bar{p}{K}^{+}{\Sigma }^0+c.c)=(1.67\pm 0.13\pm 0.12)\times 10^{-5}$, $\mathcal{B}({\chi }_{c0}\to \bar{p}{K}^{+}\Lambda +c.c.)=(13.2\pm 0.3\pm 1.0)\times 10^{-4}$, $\mathcal{B}({\chi }_{c1}\to \bar{p}{K}^{+}\Lambda +c.c.)=(4.5\pm 0.2\pm 0.4)\times 10^{-4}$ and $\mathcal{B}({\chi }_{c2}\to \bar{p}{K}^{+}\Lambda +c.c)=(8.4\pm 0.3\pm 0.6)\times 10^{-4}$, where the first error is statistical, and the second is systematic. In the decay of ${\chi }_{c0}\to \bar{p}{K}^{+}\Lambda +c.c.$, an anomalous enhancement near threshold is observed in the invariant mass distribution of $\bar{p}\Lambda +c.c.$, which cannot be explained by phase space.

12 pages, 19 figures

References in corpus (3)

• Glueballs, Hybrids, Multiquarks. Experimental facts versus QCD inspired concepts
• Study of ${\chi }_{cJ}$ radiative decays into a vector meson
• ppbar enhancement in B and J/Psi decay

Cited by in corpus (8)

• Observation and study of the decay $J/\psi \to \varphi \eta {\eta }^{\prime }$
• Measurements of $\psi (3686)\to K^{-}\Lambda {\bar{\Xi }}^{+}+c.c.$ and $\psi (3686)\to \gamma K^{-}\Lambda {\bar{\Xi }}^{+}+c.c$
• Determination of Spin-parity Quantum Numbers for the Narrow Structure Near the $p\bar{\Lambda }$ Threshold in $e^{+}{e}^{-}\to p{K}^{-}\bar{\Lambda }+c.c.$
• Observation of the decays ${\chi }_{cJ}\to {\Sigma }^0\bar{p}{K}^{+}+c.c.(J=0,1,2)$
• Enhancement near the $\bar{p}\Lambda$ threshold in the ${\chi }_{c0}\to \bar{p}{K}^{+}\Lambda$ reaction
• Partial wave analyses of $\psi (3686)\to p\bar{p}{\pi }^0$ and $\psi (3686)\to p\bar{p}\eta$
• Study of the decays ${\chi }_{cJ}\to \Lambda \bar{\Lambda }\varphi$
• Observation of the decay $\psi (3686)\to {\Sigma }^0{\bar{\Sigma }}^0\omega$