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• W2591397152 abstract "Recently, the Cachazo-He-Yuan (CHY) approach for calculating scattering amplitudes has been extended beyond tree level. In this paper, we introduce a way of constructing CHY integrands for $Phi^3$ theory up to two loops from holomorphic forms on Riemann surfaces. We give simple rules for translating Feynman diagrams into the corresponding CHY integrands. As a complementary result, we extend the $Lambda$-algorithm, originally introduced in arXiv:1604.05373, to two loops. Using this approach, we are able to analytically verify our prescription for the CHY integrands up to seven external particles at two loops. In addition, it gives a natural way of extending to higher-loop orders." @default.
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• W2591397152 date "2017-03-01" @default.
• W2591397152 modified "2023-10-16" @default.
• W2591397152 title "CHY loop integrands from holomorphic forms" @default.
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• W2591397152 doi "https://doi.org/10.1007/jhep03(2017)092" @default.
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