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arXiv 1005.4487hep-th
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Z_4对称可积模型中六点胶子散射振幅

Six-point gluon scattering amplitudes from Z_4-symmetric integrable model

Yasuyuki Hatsuda, Katsushi Ito, Kazuhiro Sakai, Yuji Satoh

摘要:

通过对Z_4对称可积模型的热力学Bethe散射方程的解析和数值研究,研究了强耦合下N=4超Yang-Mills理论中的六点胶子散射振幅.利用共形场论(CFT)微扰方法,计算了在CFT/小质量极限附近具有类属化学势的余项函数的自由能部分。结合这与Y-函数的扩展,我们得到的剩余功能附近的小质量限制的化学势的函数,这可以进行数值计算。我们还发现了大质量极限附近的剩余函数的主要修正。我们证实,这些结果是在良好的协议与数值计算。

英文摘要:

We study six-point gluon scattering amplitudes in N=4 super Yang-Mills theory at strong coupling by investigating the thermodynamic Bethe ansatz equations of the underlying Z_4-symmetric integrable model both analytically and numerically. By the conformal field theory (CFT) perturbation, we compute the free energy part of the remainder function with generic chemical potential near the CFT/small mass limit. Combining this with the expansion of the Y-functions, we obtain the remainder function near the small mass limit up to a function of the chemical potential, which can be evaluated numerically. We also find the leading corrections to the remainder function near the large mass limit. We confirm that these results are in good agreement with numerical computations.

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