Unitarity Method with Spurious Pole

Details Unitarity Method with Spurious Pole Unitarity Method with Spurious Pole

2008-06-25

arxiv.org/abs/0806.4016v3

Nucl.Phys.B811:305-352,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

49 pages; typos corrected, reference added; figures added, final version to appear in NPB

Scientific paper

10.1016/j.nuclphysb.2008.11.032

In unitarity cut method, compact input of on-shell tree level amplitudes is crucial to simplify calculations. Although BCFW on-shell recursion relation gives very compact tree level amplitudes, they usually contain spurious poles. In this paper, we present a method to deal with this issue and provide explicit simple algebraic functions for various coefficients in the presence of spurious poles. As an application, we present analytic result (not just rational term) for one-loop five gluon A(-++++) with scalar propagator for the first time.

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