The Discussion about the Spin States, the Helicity States and the Chirality States

Details The Discussion about the Spin States, the Helicity States and the Chirality States The Discussion about the Spin States, the Helicity States and the Chirality States

2011-01-03

arxiv.org/abs/1101.0481v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages

Scientific paper

The differences and the relations among the spin states, the helicity states and the chirality states of fermions in Relativistic Quantum Mechanics are discussed. It is points out emphatically that they are entirely different: a spin state is helicity degenerate; a helicity state can be expanded as linear combination of the chirality states; the polarization of fermions in flight must be described by the helicity states. The investigation of these differences can not only clarify many conceptual confusions, but also can predict a new left-right polarization asymmetry phenomenon---the lifetime asymmetry.

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