2022-01-23T21:16:02Zhttps://tsukuba.repo.nii.ac.jp/oaioai:tsukuba.repo.nii.ac.jp:000276372021-03-01T15:02:35ZT-functions and multi-gluon scattering amplitudes佐藤, 勇二Hatsuda, YasuyukiIto, KatsushiSatoh, Yuji© SISSA 2012 The original publication is available at www.springerlink.comWe study gluon scattering amplitudes/Wilson loops in =4 super Yang-Mills theory at strong coupling which correspond to minimal surfaces with a light-like polygonal boundary in AdS3. We find a concise expression of the remainder function in terms of the T-function of the associated thermodynamic Bethe ansatz (TBA) system. Continuing our previous work on the analytic expansion around the CFT/regular-polygonal limit, we derive a formula of the leading-order expansion for the general 2n-point remainder function. The T-system allows us to encode its momentum dependence in only one function of the TBA mass parameters, which is obtained by conformal perturbation theory. We compute its explicit form in the single mass cases. We also find that the rescaled remainder functions at strong coupling and at two loops are close to each other, and their ratio at the leading order approaches a constant near 0.9 for large n.Springer2012-02engjournal articlehttp://hdl.handle.net/2241/117560https://tsukuba.repo.nii.ac.jp/records/2763710.1007/JHEP02(2012)0031029-8479AA1188279XJournal of high energy physics201223https://tsukuba.repo.nii.ac.jp/record/27637/files/JHEP_2012-2.pdfapplication/pdf252.2 kB2013-12-25