How is total angular momentum conserved in particle physics?

[Quarlep]

In particle physics we know that total angular momentum is conserved and its equal to orbital angular momentum plus spin angular momentum Can you give an example for me this total angular momentum conservation with explain specificly tell orbital angular momentum and spin angular momentum.

 

[atyy]

Here si an explanation of angular momentum in quantum mechanics: http://www.eng.fsu.edu/~dommelen/quantum/style_a/advang.html

Here is an example in which conservation of angular momentum prevents certain transitions from taking place http://www.eng.fsu.edu/~dommelen/quantum/style_a/consem.html

 

[Quarlep]

thanks for help