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arXiv 1105.1892hep-lathep-phmath-phmath.MP
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格点量子色动力学与类时介子形状因子

Lattice QCD and the Timelike Pion Form Factor

Harvey B. Meyer

摘要:

给出了计算格点量子色动力学中类时区2 mpi <= sqrt{s} <= 4 mpi的π介子形状因子的公式.形状因子量化了双π介子态对真空极化的贡献。为了减少μ子反常磁矩理论上的不确定性,必须非常精确地知道μ子反常磁矩。与此同时,该公式构成了一个罕见的例子,在一个受限制的运动制度,保守的电流的谱函数可以确定从欧几里德观测没有明确的解析延续。

英文摘要:

We present a formula that allows one to calculate the pion form factor in the timelike region 2mpi <= sqrt{s} <= 4mpi in lattice QCD. The form factor quantifies the contribution of two-pion states to the vacuum polarization. It must be known very accurately in order to reduce the theoretical uncertainty on the anomalous magnetic moment of the muon. At the same time, the formula constitutes a rare example where, in a restricted kinematic regime, the spectral function of a conserved current can be determined from Euclidean observables without an explicit analytic continuation.

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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