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• W4386157111 abstract "A bstract The construction of perturbative quantities on non-linear backgrounds leads to the possibility of incorporating strong field effects in perturbation theory. We continue a programme to construct QFT observables on self-dual backgrounds in Yang-Mills theory. The approach works with asymptotic data for fields defined at null infinity $$ mathcal{I} $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mi>I</mml:mi> </mml:math> , extending earlier work on Yang-Mills amplitudes on self-dual backgrounds to form factors and further incorporating supersymmetry. Since our analysis is based on reconstruction from data at null infinity, it naturally ties into work on celestial and twisted holography. We study form factors both in pure Yang-Mills and their supersymmetric counterparts in $$ mathcal{N} $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mi>N</mml:mi> </mml:math> = 4 SYM, giving a full treatment of $$ mathcal{N} $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mi>N</mml:mi> </mml:math> = 4 super-Yang-Mills at null infinity and their self-dual nonlinear backgrounds. We obtain tree-level MHV form factors around these backgrounds using new formulae for lifting operators to twistor space leading to simple dressings of the corresponding form factors around the vacuum. We give brief indications on how to go beyond the MHV sector by introducing dressed versions of the MHV diagram propagator. We discuss generating functionals of the MHV all plus 1-loop amplitude in this context together with its various dual conformal representations." @default.
• W4386157111 created "2023-08-26" @default.
• W4386157111 creator A5021117957 @default.
• W4386157111 creator A5091952757 @default.
• W4386157111 date "2023-08-24" @default.
• W4386157111 modified "2023-09-27" @default.
• W4386157111 title "Yang-Mills form factors on self-dual backgrounds" @default.
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