Hi all,(adsbygoogle = window.adsbygoogle || []).push({});

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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# Error of narrow width approximation

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