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−→Ξ0Ξ¯0 utilizing a single-tag method. A fit to the cross section of e+e−→Ξ0Ξ¯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−→Ξ−Ξ¯+ and Ξ0Ξ¯0 is calculated using recent BESIII measurement and is found to be compatible with expectation from isospin symmetry.
Highlights
In the past few decades, many experiments have observed surprising behavior in the near-threshold region in the production cross section of nucleon pairs in e+e− collisions
In this Letter, we report a measurement of the Born cross section and the effective form factor for the process e+e− → Ξ0Ξ0 using a single-baryon-tag method at center-of-mass (CM) energies between 2.644 and 3.080 GeV
The cylindrical core of the BESIII detector covers 93% of the full solid angle and consists of a helium-based multilayer drift chamber (MDC), a plastic scintillator time-of-flight system (TOF), and a CsI(Tl) electromagnetic calorimeter (EMC), which are all enclosed in a superconducting solenoidal magnet providing a 1.0 T magnetic field
Summary
In the past few decades, many experiments have observed surprising behavior in the near-threshold region in the production cross section of nucleon pairs in e+e− collisions. The measured cross section for the process e+e− → ppis approximately constant in the energy range from threshold up to about 2 GeV [1, 2, 3, 4, 5, 6, 7, 8], with an average value of about 0.85 nb. In this Letter, we report a measurement of the Born cross section and the effective form factor for the process e+e− → Ξ0Ξ0 using a single-baryon-tag method at center-of-mass (CM) energies between 2.644 and 3.080 GeV. The data set used in this analysis corresponds to a total of about 500 pb−1 e+e− collision data [25, 26] collected with the BESIII detector [27] at the BEPCII storage rings [28]
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