\begin{document}$\psi(3686)$\end{document} data sample containing \begin{document}$(107.7\pm0.6)\times10^{6}$\end{document} events taken with the BESIII detector at the BEPCII storage ring in 2009, the \begin{document}$\chi_{c0}$\end{document} resonance parameters are precisely measured using \begin{document}$\chi_{c0,c2} \to \pi^+\pi^-/K^+K^-$\end{document} events. The mass of \begin{document}$\chi_{c0}$\end{document} is determined to be \begin{document}$M(\chi_{c0})=(3415.63\pm0.07\pm0.07\pm0.07$\end{document}) MeV/\begin{document}$c^2$\end{document}, and its full width is \begin{document}$\Gamma(\chi_{c0})=(12.52\pm0.12\pm0.13)~{\rm{MeV}}$\end{document}, where the first uncertainty is statistical, the second systematic, and the third for mass comes from \begin{document}$\chi_{c2}$\end{document} mass uncertainty. These measurements improve the precision of \begin{document}$\chi_{c0}$\end{document} mass by a factor of four and width by one order of magnitude over the previous individual measurements, and significantly boost our knowledge about the charmonium spectrum. Together with additional \begin{document}$(345.4\pm2.6)\times10^{6}$\end{document} \begin{document}$\psi(3686)$\end{document} data events taken in 2012, the decay branching fractions of \begin{document}$\chi_{c0,c2}\to\pi^+\pi^-/K^+K^-$\end{document} are measured as well, with precision improved by a factor of three compared to previous measurements. These \begin{document}$\chi_{c0}$\end{document} decay branching fractions provide important inputs for the study of glueballs."> Precise measurement of the <i>χ</i><sub><i>c</i>0</sub> resonance parameters and branching fractions of <i>χ</i><sub><i>c</i>0,<i>c</i>2</sub> → <i>π</i><sup>+</sup><i>π</i><sup>−</sup>/<i>K</i><sup>+</sup><i>K</i><sup>−</sup> -
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