Measurement of cross section for $e^{+}e^{-}\rightarrow\Xi^{0}\bar{\Xi}^{0}$ near threshold

TL;DR

This study measures the cross sections and form factors for the process $e^{+}e^{-} ightarrow ext{Xi}^0ar{ ext{Xi}}^0$ near threshold energies, finding no significant resonance or threshold enhancement, and confirms isospin symmetry in related processes.

Contribution

First measurement of cross sections and form factors for $e^{+}e^{-} ightarrow ext{Xi}^0ar{ ext{Xi}}^0$ near threshold energies using BESIII data, with analysis fitting to pQCD models.

Findings

No significant resonance or threshold enhancement observed.

The cross section ratio aligns with isospin symmetry expectations.

Results support pQCD-driven models for baryon pair production.

Abstract

Using $e^+e^-$ collision data at ten center-of-mass energies between 2.644 and 3.080 GeV collected with the BESIII detector at BEPCII and corresponding to an integrated luminosity of about 500 pb$^{-1}$, we measure the cross sections and effective form factors for the process $e^{+}e^{-}\rightarrow\Xi^{0}\bar{\Xi}^{0}$ utilizing a single-tag method. A fit to the cross section of $e^{+}e^{-}\rightarrow\Xi^{0}\bar{\Xi}^{0}$ with a pQCD-driven power function is performed, from which no significant resonance or threshold enhancement is observed. In addition, the ratio of cross sections for the processes $e^{+}e^{-}\rightarrow\Xi^{-}\bar{\Xi}^{+}$ and $\Xi^{0}\bar{\Xi}^{0}$ is calculated using recent BESIII measurement and is found to be compatible with expectation from isospin symmetry.