Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Spin projection operator

  1. Nov 16, 2012 #1
    I cannot quite understand why expression [itex] \frac{1-\gamma_5 \slashed{s}}{2} [/itex] is covariant? We defined it in the rest frame, and then said that because it is in the slashed expression, it's covariant, what does that mean? s is the direction of polarization, [itex] s \cdot s = -1 [/itex]
     
    Last edited: Nov 16, 2012
  2. jcsd
  3. Nov 17, 2012 #2
    Figured it out, one should use the identity [itex] \hat{S}(\hat{a}) \gamma^\nu \hat{S}^{-1} (\hat{a}) = a_\mu ^{\text{ } \nu} \gamma^\mu [/itex], the rest is straightforward.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Spin projection operator
  1. Spin projection (Replies: 4)

  2. Spin operator (Replies: 2)

  3. Projection operator (Replies: 1)

Loading...