Error of narrow width approximation

  1. Hi all,

    Let me ask about what is meant that
    Narrow width approximation has an error ~ ## \Gamma/m ##, is it mean
    the calculations of the cross section with NWA differ by that with no approximation by ## \Gamma/m ##.
    For ex. If ##\Gamma = 100 ## , m = 1000 and sigma = 10^-6, then sigma (NWA)= 10^-5, or this error appears
    only as a shift for the resonance peak of the inv. mass plot of the propagator products (like pp > Z > f fbar).

    Last edited: Nov 25, 2013
  2. jcsd
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