Building blocks for subleading helicity operators
Author(s)Stewart, Iain; Kolodrubetz, Daniel Walter; Moult, Ian James
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On-shell helicity methods provide powerful tools for determining scattering amplitudes, which have a one-to-one correspondence with leading power helicity operators in the Soft-Collinear Effective Theory (SCET) away from singular regions of phase space. We show that helicity based operators are also useful for enumerating power suppressed SCET operators, which encode subleading amplitude information about singular limits. In particular, we present a complete set of scalar helicity building blocks that are valid for constructing operators at any order in the SCET power expansion. We also describe an interesting angular momentum selection rule that restricts how these building blocks can be assembled.
DepartmentMassachusetts Institute of Technology. Center for Theoretical Physics; Massachusetts Institute of Technology. Department of Physics
Journal of High Energy Physics
Springer Berlin Heidelberg
Kolodrubetz, Daniel W., Ian Moult, and Iain W. Stewart. “Building Blocks for Subleading Helicity Operators.” Journal of High Energy Physics 2016.5 (2016): n. pag.
Final published version