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Spin of a quickly moving electron

  1. May 23, 2012 #1
    Suppose an electron crosses worldlines with me such our relative velocities [itex] v [/itex] are a substantial fraction of that of light. Say the electron's spin is in some state [itex]\mid\psi\rangle[/itex]; for example the doublet state. I would like to know, or read references that describe how to calculate, what state I see in my frame. Thank you.
     
  2. jcsd
  3. May 23, 2012 #2
    You are looking for the Lorentz Boosts in QFT for a Dirac Spinor.

    This is a pretty standard item to learn during the laborious process of learning QFT. It's actually one of the first things your learn. Some normal QFT books that treat this are: Peskin is standard, and I know it's in Magiorre too.
     
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