Building Blocks for Subleading Helicity Operators

Building Blocks for Subleading Helicity Operators

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...

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Veröffentlicht in:arXiv.org 2016-10
Hauptverfasser: Kolodrubetz, Daniel W, Moult, Ian, Stewart, Iain W
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Amplitudes
Angular momentum
Helicity
Operators
Physics - High Energy Physics - Phenomenology
Power
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Moult, Ian
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description 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.
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subjects Amplitudes
Angular momentum
Helicity
Operators
Physics - High Energy Physics - Phenomenology
Power
title Building Blocks for Subleading Helicity Operators
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