Obtaining BPS States in Interacting Field Theory

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arroy_0205
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What is meant by BPS state in an interacting field theory? Suppose I have the action for some theory. Now how do I obtain the BPS states for the theory? I am looking for clear steps for calculations. Also I need to know what is special about these states. You may give reference to some review article or books.
 
You might try page 441 (and thereabouts) in The Quantum Theory of Fields II by Weinberg.