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arXiv 0808.3151hep-lat
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格球矩阵元的格计算及其应用

Glueball matrix elements: a lattice calculation and applications

Harvey B. Meyer

摘要:

我们计算了SU(3)格点规范理论中胶球态与真空之间的能量动量张量的矩阵元,并将其外推到连续统中。这些矩阵元在识别富胶介子中可能起着重要的唯象作用。根据ITEP小组很久以前导出的J/psi辐射衰变的关系式,标量矩阵元导致胶球的分支比至少比实验观察到的1GeV以上f_0介子的分支比大三倍。这表明胶球成分在已知的标量介子中必须被相当强烈地稀释。最后,我们回顾了目前最好的连续测定的标量和张量胶球的质量,退变温度,弦张力和λ参数,所有的索默参考尺度的单位,使用威尔逊行动的基础上计算。

英文摘要:

We compute the matrix elements of the energy-momentum tensor between glueball states and the vacuum in SU(3) lattice gauge theory and extrapolate them to the continuum. These matrix elements may play an important phenomenological role in identifying glue-rich mesons. Based on a relation derived long ago by the ITEP group for J/psi radiative decays, the scalar matrix element leads to a branching ratio for the glueball that is at least three times larger than the experimentally observed branching ratio for the f_0 mesons above 1GeV. This suggests that the glueball component must be diluted quite strongly among the known scalar mesons. Finally we review the current best continuum determination of the scalar and tensor glueball masses, the deconfining temperature, the string tension and the Lambda parameter, all in units of the Sommer reference scale, using calculations based on the Wilson action.

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