Precise Measurement of the $\chi_{c0}$ Resonance Parameters and Branching Fractions of $\chi_{c0,c2}\to\pi^+\pi^-/K^+K^-$

TL;DR

This paper precisely measures the mass, width, and branching fractions of the $ ext{chi}_{c0}$ resonance using BESIII data, significantly improving previous measurements and providing valuable data for glueball research.

Contribution

The study provides the most precise measurements to date of $ ext{chi}_{c0}$ parameters and decay branching fractions, enhancing understanding of the charmonium spectrum.

Findings

$ ext{chi}_{c0}$ mass measured as 3415.63 MeV/$c^2$ with improved precision.

$ ext{chi}_{c0}$ width measured as 12.52 MeV, with uncertainties reduced.

Branching fractions of $ ext{chi}_{c0,c2}$ decays measured with threefold improved accuracy.

Abstract

By analyzing a $\psi(3686)$ data sample containing $(107.7\pm0.6)\times10^{6}$ events taken with the BESIII detector at the BEPCII storage ring in 2009, the $\chi_{c0}$ resonance parameters are precisely measured using $\chi_{c0,c2} \to \pi^+\pi^-/K^+K^-$ events. The mass of $\chi_{c0}$ is determined to be $M(\chi_{c0})=(3415.63\pm0.07\pm0.07\pm0.07$)~MeV/$c^2$, and its full width is $\Gamma(\chi_{c0})=(12.52\pm0.12\pm0.13)~{\rm MeV}$, where the first uncertainty is statistical, the second systematic, and the third for mass comes from $\chi_{c2}$ mass uncertainty. These measurements improve the precision of $\chi_{c0}$ 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 $(345.4\pm2.6)\times10^{6}$ $\psi(3686)$ data events taken in 2012, the decay branching fractions of $\chi_{c0,c2}\to\pi^+\pi^-/K^+K^-$ are measured as well, with precision improved by a factor of three compared to previous measurements. These $\chi_{c0}$ decay branching fractions provide important inputs for the study of glueballs.