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Error of narrow width approximation 
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#1
Nov2513, 08:04 AM

P: 55

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). Regards, S. 


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