Measurement of e+e−→K+K− cross section at s=2.00 – 3.08 GeV
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Abstract
The cross section of the process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}$ is measured at a number of center-of-mass energies $\sqrt{s}$ from 2.00 to 3.08 GeV with the BESIII detector at the Beijing Electron Positron Collider (BEPCII). The results provide the best precision achieved so far. A resonant structure around 2.2 GeV is observed in the cross section line shape. A Breit-Wigner fit yields a mass of $M=2239.2\ifmmode\pm\else\textpm\fi{}7.1\ifmmode\pm\else\textpm\fi{}11.3\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ and a width of $\mathrm{\ensuremath{\Gamma}}=139.8\ifmmode\pm\else\textpm\fi{}12.3\ifmmode\pm\else\textpm\fi{}20.6\text{ }\text{ }\mathrm{MeV}$, where the first uncertainties are statistical and the second ones are systematic. In addition, the timelike electromagnetic form factor of the kaon is determined at the individual center-of-mass energy points.
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