Abstract
Using the initial-state radiation method, the $e^+e^- \to K_S K_L$ cross section from 1.98 to 2.54 GeV is measured in a data sample of 469 fb$^{-1}$ collected with the BABAR detector. The results are used in conjunction with previous BABAR results for the $e^+e^- \to K^+ K^-$, $e^+e^- \to \pi^+\pi^-$, $e^+e^- \to \pi^+\pi^-\eta$, and $e^+e^- \to \omega\pi\pi$ cross sections to investigate the nature of the resonance structure recently observed by the BESIII experiment in the $e^+e^- \to K^+ K^-$ cross section.
Highlights
A precise measurement of the eþe− → KþK−cross section in the center-of-mass (c.m.) energy range E 1⁄4 2.00–3.08 GeV was performed by the BESIIICollaboration [1]
The eþe− → KSKL cross section in the mass region 1.96 < mðKSKLÞ < 2.56 GeV=c2 obtained from the mass spectrum in Fig. 3 after background subtraction is shown in Fig. 4
We present measurements of the eþe− → KSKL cross section in the center-of-mass range from 1.98 to 2.54 GeV
Summary
Cross section in the center-of-mass (c.m.) energy range E 1⁄4 2.00–3.08 GeV was performed by the BESIII. [1], the parameters of the resonance structure observed in the eþe− → KþK− cross section differ from the φð2170Þ PDG parameters by more than 3σ in mass and more than 2σ in width. The most precise data on this reaction near 2 GeV were obtained by the BABAR Collaboration [10] In this previous work, the eþe− → KSKL cross section was measured up to 2.2 GeV. The parameters for the fit to the eþe− → KþK− cross section data from BESIII and BABAR.
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