The symbol and alphabet of two-loop NMHV amplitudes from Q equations
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- He2021_Article_TheSymbolAndAlphabetOfTwo-loop
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We study the symbol and the alphabet for two-loop NMHV amplitudes in planar N = 4 super-Yang-Mills from the Q equations, which provide a first-principle method for computing multi-loop amplitudes. Starting from one-loop (NMHV)-M-2 ratio functions, we explain in detail how to use Q equations to obtain the total differential of two-loop n-point NMHV amplitudes, whose symbol contains letters that are algebraic functions of kinematics for n >= 8. We present explicit formula with nice patterns for the part of the symbol involving algebraic letters for all multiplicities, and we find 17 - 2m multiplicative-independent letters for a given square root of Gram determinant, with 0
Originalsprog | Engelsk |
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Artikelnummer | 278 |
Tidsskrift | Journal of High Energy Physics |
Vol/bind | 2021 |
Udgave nummer | 3 |
Antal sider | 44 |
ISSN | 1029-8479 |
DOI | |
Status | Udgivet - 30 mar. 2021 |
ID: 260546863