论文标题
通过$ j/ψ$的辐射衰减来重新访问$ f_0 $介子中胶球组件的确定分数
Revisiting the determining fraction of glueball component in $f_0$ mesons via radiative decays of $J/ψ$
论文作者
论文摘要
QCD理论预测了胶球的存在，但是到目前为止，所有实验性努力都无法识别任何此类状态。为了解决QCD之间的这种差异，QCD已被证明是成功互动的成功理论，以及对胶球的实验搜索失败，人们很想接受有希望的解释，即胶球与常规的$ q \ bar q \ bar q $相同的量子数量的状态。纯$ 0^{++} $粘合球的质量估计范围从1到2 GEV，这是$ f_0 $ family的区域。因此，许多作者认为，$ f_0 $中的系列系列是研究胶球和$ q \ bar Q $的理想场所。在本文中，遵循Close，Farrar和Li提出的策略，我们尝试使用测量的质谱来确定$ f_0 $ ersons中的粘合球组件的比例，以及$ j/ψ$辐射衰减的分支比率为$ f_0 $ f_0 $。由于Close等人的开创性论文已经过去了20多年，并且已经通过多个实验合作进行了更准确的测量，因此现在是时候使用新数据重新审视这个有趣的主题了。我们假设$ f_0（500）$和$ f_0（980）$是纯夸克状态，而对于$ f_0（1370）$，$ f_0（1500）$和$ f_0（1710）$，可以符合$ J/ψ$辐射式deNADE的实验数据，并且需要大量辐射decay及其群众组合。此外，纯$ 0^{++} $粘合球的质量是现象学确定的。
QCD theory predicts the existence of glueballs, but so far all experimental endeavors have failed to identify any such states. To remedy this discrepancy between QCD, which has proven to be a successful theory for strong interactions, and the failure of experimental searches for glueballs, one is tempted to accept the promising interpretation that the glueballs mix with regular $q\bar q$ states of the same quantum numbers. The lattice estimate of the masses of pure $0^{++}$ glueballs ranges from 1 to 2 GeV, which is the region of the $f_0$ family. Thus many authors suggest that the $f_0$ mesonic series is an ideal place to study possible mixtures of glueballs and $q\bar q$. In this paper, following the strategy proposed by Close, Farrar and Li, we try to determine the fraction of glueball components in $f_0$ mesons using the measured mass spectra and the branching ratios of $J/ψ$ radiative decays into $f_0$ mesons. Since the pioneering papers by Close et al., more than 20 years has elapsed and more accurate measurements have been done by several experimental collaborations, so it is time to revisit this interesting topic using new data. We suppose $f_0(500)$ and $f_0(980)$ to be pure quark states, while for $f_0(1370)$, $f_0(1500)$ and $f_0(1710)$, to fit both the experimental data of $J/ψ$ radiative decay and their mass spectra, glueball components are needed. Moreover, the mass of the pure $0^{++}$ glueball is phenomenologically determined.
