The existence of the anti-hyperons was proven by the discovery of an anti-lambda by M. Baldo-Ceolin and

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The existence of the anti-hyperons was proven by the discovery of an anti-lambda by M. Baldo-Ceolin and D. J. Prowse in 1958. A beam of negative pions with energy Eπ = 4.6 GeV hit an emulsion stack. What is the final state containing a Λ̅ that can be produced in a πp collision at minimum energy? Find the threshold energy if the  target protons are free and, approximately, if they are bound inside nuclei with a Fermi momentum p= 150 MeV. Assuming that the pion beam was produced at a distance l = 8 m upstream of the emulsion and that the number of produced pions was N0 = 106/cm2, how many pions per cmreached the emulsion?

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