What is meant by the mass of a superfield?

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The mass of a superfield is defined as \(\frac{\partial^2 W}{\partial \Phi_H^2}\) according to the slides on Supersymmetry - Holomorphy. The equations of motion are given by \(\frac{\partial W}{\partial \Phi_H} = 0\) rather than \(\frac{\delta \mathcal{L}}{\delta \Phi_H} = 0\) due to the dominance of potential terms over kinetic terms in the low energy limit. This distinction is crucial for understanding the behavior of superfields in supersymmetric theories.

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QFT1995
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I'm specifically referring to these slides Supersymmetry - Holomorphy on pages 7 and 8.

Why is the mass of the superfield defined as \frac{\partial^2W}{\partial \Phi_H^2}

and why are the equations of motion \frac{\partial W}{\partial \Phi_H}= 0 and not \frac{\delta \mathcal{L}}{\delta \Phi_H}= 0?
 
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Does it have something to do with that in the low energy limit, the kinetic terms are irrelevant compared to the potential terms?
 

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