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arXiv 0903.3224hep-lat
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具有2+1味畴壁费米子的格点量子色动力学底谱

The bottomonium spectrum from lattice QCD with 2+1 flavors of domain wall fermions

Stefan Meinel

摘要:

最近,RBC和UKQCD合作组对畴壁费米子和岩崎规范作用量的2+1味进行了实际的格点量子色动力学计算。这里,给出了在尺寸为24^3x64、晶格间距约为0.11 fm、轻夸克质量为四个不同值的规范组态上计算的底鎓能谱的结果。改进的格点NRQCD被用来处理bottomonium中的b夸克。径向和轨道能量分裂的计算结果与实验测量值符合得很好,表明系统误差很小。Uppersons(2S)-Uppersons(1 S)能量分裂的计算提供了晶格间距的独立确定。对于大多数物理系综,发现它是a^{-1}=1.740(25)(19)GeV,其中第一个误差是统计/拟合的,第二个误差是由于晶格NRQCD作用引起的系统误差的估计。

英文摘要:

Recently, realistic lattice QCD calculations with 2+1 flavors of domain wall fermions and the Iwasaki gauge action have been performed by the RBC and UKQCD collaborations. Here, results for the bottomonium spectrum computed on their gauge configurations of size 24^3x64 with a lattice spacing of approximately 0.11 fm and four different values for the light quark mass are presented. Improved lattice NRQCD is used to treat the b quarks inside the bottomonium. The results for the radial and orbital energy splittings are found to be in good agreement with experimental measurements, indicating that systematic errors are small. The calculation of the Upsilon(2S)-Upsilon(1S) energy splitting provides an independent determination of the lattice spacing. For the most physical ensemble it is found to be a^{-1}=1.740(25)(19) GeV, where the first error is statistical/fitting and the second error is an estimate of the systematic errors due to the lattice NRQCD action.

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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