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arXiv 1008.3499hep-phhep-th
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高阶大规模O(N)非线性西格玛模型

The Massive O(N) Non-linear Sigma Model at High Orders

Johan Bijnens, Lisa Carloni

摘要:

我们扩展了我们的大规模$O(N)$非线性西格玛模型的其他可观的工作。在大$N$展开式中,我们导出了衰变常数、真空期望值、介子-介子散射以及标量和矢量形状因子在环展开式中各阶的表达式。这是通过使用仙人掌图重建,使用广义间隙方程和其他递归关系。对于一般的$N$,我们导出了$n$次环序前导谱$\left(M^2/F^2\log(μ^2/M^2)\right)^n$,衰变常数和真空期望值(VEV)的五个环,介子-介子散射的四个环,标量和矢量形状因子的表达式。我们还引用了我们以前关于质量的结果。对于$N=3$的情况,大的$N$结果没有给出良好的近似。利用所得结果研究了摄动级数的收敛性,并与弹性么正性进行了比较。

英文摘要:

We extend our earlier work on the massive $O(N)$ nonlinear sigma model to other observables. We derive expressions at leading order in the large $N$ expansion at all orders in the loop expansion for the decay constant, vacuum expectation value, meson-meson scattering and the scalar and vector form factors. This is done using cactus diagram resummation using a generalized gap equation and other recursion relations. For general $N$ we derive the expressions for the $n$-th loop order leading logarithms $\left(M^2/F^2\log(μ^2/M^2)\right)^n$, up to five-loops for the decay constant and vacuum expectation value (VEV) and up to four-loops for meson-meson scattering, the scalar and vector form factors. We also quote our earlier result for the mass. The large $N$ results do not give a good approximation for the case $N=3$. We use our results to study the convergence of the perturbative series and compare with elastic unitarity.

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