Talk:Helicity basis

Bad dimensions
The dimensions in the equation
 * $$\xi_{+1}(\vec{p}) = \sqrt{\frac{2 |\vec{p}|}{|\vec{p}| + p_z}}

\begin{pmatrix} p_x+i p_y \end{pmatrix} = \begin{pmatrix} \cos{\frac{\theta}{2}}\\ e^{i\phi}\sin{\frac{\theta}{2}} \end{pmatrix}\,$$ are definitely wrong as cos and sin are dimensionless. — Preceding unsigned comment added by Hardi27 (talk • contribs) 09:53, 30 September 2012 (UTC)
 * \vec{p}|+p_z\\


 * It appears to have been fixed at some point. 67.198.37.16 (talk) 03:09, 1 December 2020 (UTC)

Notation
It is not clear from the article what $$\chi_\lambda$$ is. I assume it is supposed to be a helicity eigenstate, like $$\xi_\lambda$$, but it is not actually defined as such anywhere. (Bjfar (talk) 03:10, 22 April 2013 (UTC))


 * I'm fairly confident that $$\chi_\lambda=\xi_\lambda$$ and its just a screw-up typo in the equations. But not my ball-o-wax, so I won't mess with it. Yes this needs to be fixed. 67.198.37.16 (talk) 03:16, 1 December 2020 (UTC)