Cross sections measurement of $e^+e^- o Ξ(1530)^0arΞ^0 + c.c.$ and search for $ψ(3770) oΞ(1530)^0arΞ^0 + c.c.$

Using $e^+e^-$ collision data collected with the BESIII detector corresponding to an integrated luminosity of 44.2 fb$^{-1}$, we measure the Born cross sections for the process $e^+e^- \to Ξ(1530)^{0} \barΞ^{0} + c.c.$ at forty-eight center-of-mass energies between 3.51 and 4.95 GeV. The potential signal from non-$D\bar{D}$ decays for $ψ(3770)$, i.e. $ψ(3770)\to Ξ(1530)^{0} \barΞ^{0}+ c.c.$, is investigated by fitting the dressed cross section, no obvious signal is found. The upper limit of $\mathcal{B}(ψ(3770) \to Ξ(1530)^{0} \barΞ^{0}$) at 90% confidence level is given.

💡 Research Summary

The BESIII Collaboration reports a comprehensive measurement of the Born cross sections for the process $e^{+}e^{-}\to \Xi(1530)^{0}\bar\Xi^{0}+c.c.$ over a wide center‑of‑mass energy range from 3.51 GeV to 4.95 GeV. The analysis is based on an integrated luminosity of 44.2 fb$^{-1}$ collected at 48 distinct energy points. The $\Xi(1530)^{0}$ is reconstructed via its dominant decay $\Xi(1530)^{0}\to\Xi^{-}\pi^{+}$, with subsequent decays $\Xi^{-}\to\Lambda\pi^{-}$ and $\Lambda\to p\pi^{-}$. A stringent event selection, including track quality cuts, particle‑identification criteria, vertex fitting, and a multivariate classifier, is employed to suppress combinatorial background. Signal yields are extracted by fitting the invariant mass distribution of the $\Xi^{-}\pi^{+}$ system with a Gaussian signal shape superimposed on a polynomial background.

The Born cross section is obtained using the formula
\