Observation of the $\psi (3686)$ decays into ${\mathrm{\Sigma }}^{+}{\bar{\mathrm{\Sigma }}}^{-}\omega$ and ${\mathrm{\Sigma }}^{+}{\bar{\mathrm{\Sigma }}}^{-}\mathcal{\phi }$

Based on $(27.08\pm 0.14)\times {10}^8$ $\psi (3686)$ events collected with the BESIII detector operating at the BEPCII collider, the $\psi (3686)\to {\mathrm{\Sigma }}^{+}{\bar{\mathrm{\Sigma }}}^{-}\omega$ and ${\mathrm{\Sigma }}^{+}{\bar{\mathrm{\Sigma }}}^{-}\phi$ decays are observed for the first time with statistical significances of 13.8$\sigma$ and 7.6$\sigma$, respectively. The corresponding branching fractions are measured to be $\mathcal{B}(\psi (3686)\to {\mathrm{\Sigma }}^{+}{\bar{\mathrm{\Sigma }}}^{-}\omega )=(1.90\pm 0.18\pm 0.21)\times {10}^{-5}$ and $\mathcal{B}(\psi (3686)\to {\mathrm{\Sigma }}^{+}{\bar{\mathrm{\Sigma }}}^{-}\phi )=(2.96\pm 0.54\pm 0.41)\times {10}^{-6}$, where the first uncertainties are statistical and the second systematic.