Spin of Particle: Charge & Neutrality Effects

[shakeel]

how the spin is associated with a particle. is there a difference in spin for charge particle and a neutral particle, i mean difference in spin due to charge or spin is independent of charge. what is procedure to assign spin to a particle? p help.

 

[marlon]

The procedure which introduces spin formally, requires you to know some group theory : irreducible representations (IR) of a symmetry group etc. Do you know this ? If not, answering your question is going to be difficult.

In short : spin is assigned because of symmetry. More specifically, in QM the following concepts are invariant under spatial rotations:

1) the normalization of the wavefunction
2) the expectation value of any observable
3) the Hamiltonian



For this symmetry to be respected, the wavefunctions need to "behave" in a certain way under such rotations. Mathematically one says : the wavefunctions need to transform under certain IR of the rotational symmetry group.

One set of wavefunctions that respects this demand are the spinors. They are defined based upon their behaviour under rotatios. If A is a spinor and you rotate it 360 degress you get -A.

To read the full story, go check https://www.physicsforums.com/blogs/marlon-13790/what-is-spin-152/

marlon

 

[sir-pinski]

The spin of a particle is a fundamental property that is associated with its intrinsic angular momentum. It is a quantum mechanical property and cannot be visualized in classical terms. The spin of a particle is denoted by the quantum number, s, and can have values of 0, 1/2, 1, 3/2, etc.

There is a difference in spin for charged particles and neutral particles. This is because the spin of a particle is independent of its charge. In other words, the spin does not depend on whether the particle has a positive or negative charge, or no charge at all. The spin is a fundamental property of a particle and is not affected by its charge.

The procedure to assign spin to a particle is based on experimental observations and theoretical calculations. In order to determine the spin of a particle, scientists use various techniques such as scattering experiments, spectroscopy, and quantum field theory calculations. These methods help to determine the spin of a particle by studying its interactions with other particles and fields.

In summary, the spin of a particle is a fundamental property associated with its intrinsic angular momentum. It is independent of the particle's charge and is determined through experimental and theoretical methods.