arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0711.3902hep-phhep-ex
收藏

轻标量介子中的胶球

The glueball among the light scalar mesons

Wolfgang Ochs

摘要:

最轻的胶子介子预计J^{PC}=0^{++},在全QCD的计算中,其质量约为1 GeV。标量介子谱的解释受到阻碍,因为一些国家是相当广泛的。在600-1800 MeV范围内,对π + π- \to π + π-,π 0 π 0散射进行了与模型无关的分析,得到了等散射S波的唯一解。共振f_0(980)、f_0(1500)和宽f_0(600)或“σ”被清楚地识别,而在水平B(f_0(1370)\to pi pi)\gtrsim 10%处未观察到f_0(1370)。大国家是一个胶球的论点被召回。我们认为没有矛盾与报告的大B(西格玛\to伽玛),并提出一些进一步的实验测试。

英文摘要:

The lightest gluonic meson is expected with J^{PC}=0^{++}, calculations in full QCD point towards a mass of around 1 GeV. The interpretation of the scalar meson spectrum is hindered as some states are rather broad. In a largely model-independent analysis of pi+ pi- \to pi+ pi-, pi0 pi0 scattering in the region 600-1800 MeV a unique solution for the isoscalar S-wave is obtained. The resonances f_0(980), f_0(1500) and the broad f_0(600) or ``sigma'' are clearly identified whereas f_0(1370) is not seen at the level B(f_0(1370)\to pi pi)\gtrsim 10%. Arguments for the broad state to be a glueball are recalled. We see no contradiction with the reported large B(sigma \to gamma gamma) and propose some further experimental tests.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑