Boundary Contributions Using Fermion Pair Deformation
Bo Feng, Zhibai Zhang
TL;DR
This paper explores boundary contributions in tree-level amplitudes using fermion pair deformation within the BCFW recursion framework, extending it to off-shell gluon currents and demonstrating applications in QCD.
Contribution
It introduces a general strategy for calculating boundary contributions from fermion pair deformation and extends BCFW recursion to off-shell gluon currents.
Findings
Derived boundary contributions for fermion pair deformations in QCD.
Extended BCFW recursion to off-shell gluon currents.
Validated methods with examples in standard and deformed QCD.
Abstract
Continuing the study of boundary BCFW recursion relation of tree level amplitudes initiated in \cite{Feng:2009ei}, we consider boundary contributions coming from fermion pair deformation. We present the general strategy for these boundary contributions and demonstrate calculations using two examples, i.e, the standard QCD and deformed QCD with anomalous magnetic momentum coupling. As a by-product, we have extended BCFW recursion relation to off-shell gluon current, where because off-shell gluon current is not gauge invariant, a new feature must be cooperated.
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