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## Main Question or Discussion Point

Hello!

I am studying Zeidler's QFT Volume II, and I have a query on page 808:

It is claimed that

I tried my hand at deriving this, but when we write

then the S^3

but I don't see why the S^1

To those who are knowledgeable and happen to have access to the book,

could you please help me out? Many thanks!

I am studying Zeidler's QFT Volume II, and I have a query on page 808:

It is claimed that

**S**Ψ^+_{**p**,s} = (s**k**)Ψ^+_{**p**,s} when**p**=p^3**k**.I tried my hand at deriving this, but when we write

**S**=S^1**i**+S^2**j**+S^3**k**,then the S^3

**k**term acting on Ψ^+_{**p**,s} does give s**k**Ψ^+_{**p**,s},but I don't see why the S^1

**i**and S^2**j**terms don't give any contribution.To those who are knowledgeable and happen to have access to the book,

could you please help me out? Many thanks!