Banner: Helicity
Adjective Definition
Helicity $\delta _{z} \equiv \begin{cases} +1 \ \ &\sf{\text{if}} \ \ &N^{\mathsf{U}} \ > \ N^{\mathsf{D}} \\ \ \ 0 \ \ &\sf{\text{if}} \ \ &N^{\mathsf{U}} \ = \, N^{\mathsf{D}} \\ -1 \ \ &\sf{\text{if}} \ \ &N^{\mathsf{U}} \ < \ N^{\mathsf{D}} \end{cases}$ 5-38
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