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Normalization condition

  1. Feb 26, 2010 #1
    In Peskin's textbook, he uses the spin sum as [tex] \sum u\bar{u} = \gamma^{\mu}p_{\mu} +m[/tex] ;
    on the other hand, in Kaku's book and in Zee's book, they use [tex] \sum u\bar{u} = \dfrac{\gamma^{\mu} p_{\mu} + m}{2m} [/tex] . But why aren't there any diffferent in the differential cross
    section formula ?
  2. jcsd
  3. Feb 26, 2010 #2


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    Science Advisor

    The normalization condition should not affect any physical result.
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