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Very simple question on SM

  1. Aug 23, 2008 #1
    Dear All,
    I dont understand how/why Halzen Martin use J_em J_3 and introduced J_Y currents to build SU(2)*U(1) theory....can anyone advise something...

    thank you
     
  2. jcsd
  3. Aug 23, 2008 #2
    I would suspect perhaps because these are the Casimir operators of the group? Just a wild guess, I don't have a copy of Halzen Martin's book or work or am I able to find a relevant quote :(
     
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