Massless particles in five and higher dimensions
We describe a five-dimensional analogue of Wigner's operator equation ${\mathbb W}_a = λP_a$, where ${\mathbb W}_a $ is the Pauli-Lubanski vector, $P_a$ the energy-momentum operator, and $λ$ the helicity of a massless particle. Higher dimensional generalisations are also given.
hep-th↗