Measurement of the $e^{+} e^{-} \to Σ^{0} {\bar{Σ}}^{0}$ cross sections at center-of-mass energies from $2.3864$ to $3.0200$ GeV

M. Ablikim,M. N. Achasov，B. S. Zou,J. H. Zou

semanticscholar（2021）

Cited 0|Views38

Abstract

The Born cross sections of

e^{+} e^{-} \to Σ^{0} {\bar{Σ}}^{0}

are measured at center-of-mass energies from

2.3864

3.0200

GeV using data samples with an integrated luminosity of

328.5

^{- 1}

collected with the BESIII detector operating at the BEPCII collider. The analysis makes use of a novel reconstruction method for energies near production threshold, while a single-tag method is employed at other center-of-mass energies. The measured cross sections are consistent with earlier results from BaBar, with a substantially improved precision. The cross-section lineshape can be well described by a perturbative QCD-driven energy function. In addition, the effective form factors of the

Σ^{0}

baryon are determined. The results provide precise experimental input for testing various theoretical predictions.

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【要点】：本研究通过BESIII探测器在BEPCII对撞机上收集的数据，测量了$e^{+}e^{-}\to\Sigma^{0}\bar{\Sigma}^{0}$反应在$2.3864$至$3.0200$ GeV质心能量的截面，并创新采用了一种新型的重建方法，显著提高了测量精度。
【方法】：使用BESIII探测器收集数据，并采用了一种新型的重建方法处理接近产生阈值的能量，以及单标记方法处理其他质心能量。
【实验】：在BEPCII对撞机上，通过BESIII探测器收集了总积分亮度为$328.5$ pb$^{-1}$的数据样本，测量结果与BaBar实验的早期结果一致，但精度显著提高。

Measurement of the e+e−→Σ0Σ¯0 cross sections at center-of-mass energies from 2.3864 to 3.0200 GeV

Measurement of the $e^{+} e^{-} \to Σ^{0} {\bar{Σ}}^{0}$ cross sections at center-of-mass energies from $2.3864$ to $3.0200$ GeV