旋转的折叠闭合弦的Gynesian球
Glueballs as rotating folded closed strings
摘要：
在以前的论文中，我们认为介子和重子可以被描述为在全息背景中旋转的开弦。现在我们转向闭弦，它应该是胶球的弦。我们在平面和弯曲的背景下观察旋转的折叠闭合弦。闭弦模型的一个基本预测是，雷吉轨道的斜率是开弦的一半。我们提出一种识别胶球的简单方法，即寻找属于斜率约为0.45 GeV^-2（介子斜率的一半）的轨道的共振。因此，我们研究无味轻介子的实验光谱，看看这样一个方案，其中一些状态被放置在开弦轨道上，一些被放置在闭弦轨道上，是否可以拟合已知的实验数据。我们研究f_0（J^PC = 0^++）和f_2（2^++）共振。由于没有偏好的一个单一的方案来排序不同的状态到介子和胶球轨迹，我们提出了几种可能性，每一个确定一个不同的状态作为胶球。我们补充每个计划与兴奋胶球的质量的预测。我们表明，胶子球和介子衰变成两个介子的宽度是不同的，从而提供了一个辅助工具来区分它们。此外，我们还研究了胶球谱的一些格点量子色动力学结果，并检验了它们与闭弦模型的相容性。本文的主要结论之一是，需要扩展无味强子谱的实验数据，特别是在2.4 GeV和3 GeV之间的区域。
英文摘要：
In previous papers we argued that mesons and baryons can be described as rotating open strings in holographic backgrounds. Now we turn to closed strings, which should be the duals of glueballs. We look at the rotating folded closed string in both flat and curved backgrounds. A basic prediction of the closed string model is that the slope of Regge trajectories is half that of open strings. We propose that a simple method to identify glueballs is to look for resonances that belong to trajectories with a slope of approximately 0.45 GeV^-2, half the meson slope. We therefore look at the experimental spectra of flavorless light mesons to see if such a scheme, where some of the states are placed on open string trajectories and some on closed ones, can fit known experimental data. We look at the f_0 (J^PC = 0^++) and f_2 (2^++) resonances. As there is no preference for a single scheme of sorting the different states into meson and glueball trajectories, we present several possibilities, each identifying a different state as the glueball. We supplement each scheme with predictions for the masses of excited glueballs. We show that the width of the decay into two mesons is different for glueballs and mesons thus providing a supplementary tool to distinguish between them. In addition, we look at some lattice QCD results for glueball spectra and check their compatibility with the closed string model. One of the main conclusions of this paper is that an extension of experimental data on the spectrum of flavorless hadrons is needed, in particular in the region between around 2.4 GeV and 3 GeV.
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