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arXiv 0710.3056hep-ph
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我们是如何发现轻标量介子的九重态的

How we discovered the nonet of light scalar mesons

Eef van Beveren, George Rupp

摘要:

同时,格点QCD计算也证实了非奇异夸克-反夸克系统的限制谱在共振谱展开(RSE)中对于1 GeV以上的标量介子有其基态。例如,在S波K介子-π介子RSE振幅中,预测了略高于1.4 GeV的宽共振[hep-ex/0106077],这通过实验确认为K*0(1430)。然而,轻标量介子的完整九重态被预言(Zeit.Phys.C30,615 [http://www-spires.slac.stanford.edu/spires/find/hep? key=1573454]),当一个模型与RSE密切相关,并最初开发用于描述重夸克偶素共振谱(Phys.Rev.D21,772 [http://www-spires.slac.stanford.edu/spires/find/hep? key=363162])应用于光夸克扇区。因此,人们发现轻标量介子九重态构成了普通介子谱的一部分,尽管是由“异常”[hep-ph/0701038]极点[hep-ex/0106077]表示。类似的共振和束缚态出现在charmed扇区[hep-ph/0305035],并在B介子谱[hep-ph/0312078,hep-ph/0406242]中预测。最近的一项工作[hep-ph/0703286]证实了在BES、E791和FOCUS合作测量的S波和P波π介子-π介子和K介子-π介子对三体衰变过程的贡献的RSE振幅中存在轻标量介子极。

英文摘要:

As has been confirmed meanwhile by lattice-QCD calculations (see e.g. hep-lat/0702023), the confinement spectrum of non-exotic quark-antiquark systems has its ground state for scalar mesons well above 1 GeV in the Resonance Spectrum Expansion (RSE). For instance, in the S-wave Kaon-pion RSE amplitude, a broad resonance was predicted slightly above 1.4 GeV [hep-ex/0106077], which is confirmed by experiment as the K*0(1430). However, a complete nonet of light scalar mesons was predicted (Zeit.Phys.C30,615 [http://www-spires.slac.stanford.edu/spires/find/hep?key=1573454]) as well, when a model strongly related to the RSE and initially developed to describe the heavy quarkonia resonance spectra (Phys.Rev.D21,772 [http://www-spires.slac.stanford.edu/spires/find/hep?key=363162]) was applied in the light-quark sector. Thus, it was found that the light scalar-meson nonet constitutes part of the ordinary meson spectrum, albeit represented by "extraordinary" [hep-ph/0701038] poles [hep-ex/0106077]. Similar resonances and bound states appear in the charmed sector [hep-ph/0305035], and are predicted in the B-meson spectrum [hep-ph/0312078, hep-ph/0406242]. A recent work [hep-ph/0703286] confirmed the presence of light scalar-meson poles in the RSE amplitude for S-wave and P-wave pion-pion and Kaon-pion contributions to three-body decay processes measured by the BES, E791 and FOCUS collaborations.

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。

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