In (hbar=c=1) natural units a particular hadronic cross section (sigma) is estimated to be where the mass

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In \(\hbar=c=1\) natural units a particular hadronic cross section \(\sigma\) is estimated to be

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where the mass of the pion is \(M_{\pi} \sim 140 \mathrm{MeV}\). What is this cross section in more standard units of barns (b), where \(1 \mathrm{~b} \equiv 10^{-24} \mathrm{~cm}^{2}\) ?

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