Engineering topics
Publications and source records attributed to Onishchenko, A. I..
Cross sections for B{sub c} meson pair production in e{sup +}e{sup –} annihilation are calculated within the one-loop approximation.
In this note we consider tree level form factors of operators from stress tensor supermultiplet with light like operator momentum q{sup 2} = 0. The presentation of form factors in terms of the regulated integral over Grassmannian is given. The conjectured formula is verified by successfully reproducing known answers in the MHV and N{sup k−2}MHV, k ≥ 3 sectors as well as appropriate soft limit behavior.
The Grassmannian representation for gauge-invariant amplitudes for arbitrary number of legs with one of them being off-shell is derived for the case of N = 4 SYM. The obtained formula are successfully checked against known BCFW results for MHV{sub n}, NMHV{sub 4} and NMHV{sub 5} amplitudes.