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Homework Help: Question form Peskin Schroeder

  1. Jul 20, 2007 #1
    Sorry for bothering...
    How does righthand side of formula 5.94 is derived from its left handside after some approximation?
    Probably it is very simple question but I could't get that expression:confused:

    Thank u very much

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  3. Jul 20, 2007 #2

    George Jones

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    Using [itex]e^2 = 16 \pi^2 \alpha^2,[/itex] the left side is

    [tex]\frac{2 \pi \alpha^2}{4E^2 + 4E \omega cos \theta}.[/tex]

    Now use an exact expression for [itex]E^2[/itex] and a two-term approximation to [itex]E[/itex] to get the right side.
    Last edited: Jul 20, 2007
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