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arXiv 0805.2913hep-lathep-phhep-th
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SU(N)纯规范理论中耦合的运行

The running of the coupling in SU(N) pure gauge theories

Biagio Lucini, Gregory Moraitis

摘要:

在SU(4)规范理论中,利用薛定谔泛函技术研究了耦合的运行。当能量达到弦张力$σ$的平方根量级时,运行符合双圈微扰公式。将微扰与运行的非微扰状态相关联并转换为$\msbar$方案允许提取比率$Λ_{\msbar}/\sqrtσ$。然后将结果与文献中SU(2)和SU(3)的类似计算结合使用,以在大的$N$极限中提取$Λ_{\msbar}/\sqrtσ$。我们对$N=3,4$的结果与最近用Parisi平均场方案作为中间方案进行的相同数量的研究一致,而SU(2)中的$Λ_{\msbar}/\sqrtσ$结果相差2.5%。这种差异的可能解释进行了讨论。

英文摘要:

The running of the coupling is studied in SU(4) gauge theory using the Schrödinger functional technique. Up to energies of the order of the square root of the string tension $σ$, the running is found to agree with the two-loop perturbative formula. Relating the perturbative to the non-perturbative regime of the running and converting to the $\msbar$ scheme allows one to extract the ratio $Λ_{\msbar}/\sqrtσ$. The result is then used in combination with similar calculations present in the literature for SU(2) and SU(3) to extract $Λ_{\msbar}/\sqrtσ$ in the large $N$ limit. Our results for $N=3,4$ agree with a recent study of the same quantity performed using the Parisi mean field scheme as an intermediate scheme, while $Λ_{\msbar}/\sqrtσ$ in SU(2) turns out to differ by 2.5%. Possible explanations of this discrepancy are discussed.

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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