id: 05907807
dt: j
an: 05907807
au: Brandhuber, Andreas; Spence, Bill; Travaglini, Gabriele; Yang, Gang
ti: Form factors in ${\cal N} = 4$ super Yang-Mills and periodic Wilson loops.
so: J. High Energy Phys. 2011, No. 1, 134, 22 p., electronic only (2011).
py: 2011
pu: Springer, Berlin
la: EN
cc: 
ut: supersymmetric gauge theory; extended supersymmetry; ads-CFT
    correspondence; gauge symmetry
ci: 
li: doi:10.1007/JHEP01(2011)134
ab: Summary: We calculate form factors of half-BPS operators in ${\cal N} = 4$
    super Yang-Mills theory at tree level and one loop using novel
    applications of recursion relations and unitarity. In particular, we
    determine the expression of the one-loop form factors with two scalars
    and an arbitrary number of positive-helicity gluons. These quantities
    resemble closely the MHV scattering amplitudes, including
    holomorphicity of the tree-level form factor, and the expansion in
    terms of two-mass easy box functions of the one-loop result. Next, we
    compare our result for these form factors to the calculation of a
    particular periodic Wilson loop at one loop, finding agreement. This
    suggests a novel duality relating form factors to periodic Wilson
    loops.
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