Heavy-quarkonium systems and the QCD scale parameter Lambda MS
Heavy-quarkonium systems and the QCD scale parameter Lambda MS
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DOI：
10.1103/physrevd.33.3349
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发表时间：
1986-06
期刊：
影响因子：
--
通讯作者：
Igi;Ōno
中科院分区：
文献类型：
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作者：
Igi;Ōno
我们研究了t-夸克偶素态的性质如何依赖于标度参数。lambda../ sub MS/，其中MS是修改的最小减法方案。我们发现如果... lambda../ sub MS/小到100 MeV时，m/sub t/约为40 GeV的低位tt-bar态的QQ-bar势的形状已经几乎唯一确定，而如果lambda../ sub MS/大到500 MeV，E（2S）-E（1 S）中的模糊度，例如，变得更大（约20%）。我们还研究了非相对论模型和相对论模型对t-夸克偶素谱的预测差异。最后，我们表明，超精细和精细分裂是敏感的值。lambda../ sub MS/，因此允许的范围为。lambda../ sub MS/可能受到已知夸克偶素、cc-bar和bb-bar数据的限制。
We study how the properties of t-quarkonium states depend on the scale parameter ..lambda../sub MS/, where MS is the modified minimal subtraction scheme. We find that if ..lambda../sub MS/ is as small as 100 MeV the shape of the QQ-bar potential for the low-lying tt-bar states with m/sub t/approx.40 GeV is already almost uniquely determined while if ..lambda../sub MS/ is as large as 500 MeV the ambiguity in E(2S)-E(1S), e.g., becomes much larger (approx.20%). We also study the difference of predictions of t-quarkonium spectra between nonrelativistic and relativistic models. Finally we show that hyperfine and fine splittings are sensitive to the value of ..lambda../sub MS/, and hence the allowed range of ..lambda../sub MS/ may be restricted from the data of already known quarkonia, cc-bar and bb-bar.