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Error of narrow width approximation
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Nov25-13, 08:04 AM
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).
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