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I have this article in which I saw that for a spin 1/2 particle confined to move along a ring positiond in a magnetic field with a z and \varphi

The Hamiltonian is given by: (in second attacment)

What I do not understand is how do you get the last term in the Hamiltonian.

Any help?

Thanks in advance

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# Hamiltonian of spin 1/2 in tangential magnetic field

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