Can antimatter(positron) can be converted into a matter(electron)

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Can antimatter(positron) can be converted into a matter(electron) . If yes what other particles are created in that reaction
 
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For leptons (muons, electrons, etc.), the sum of the number of leptons plus the number of anti-leptons is a constant. So if a positron disappears, an electron will have to disappear also. So there is no "conversion". A negative muon can decay into an electron plus neutrinos. A positive (anti-) muon can decay into a positron plus neutrinos. When Fermilab creates say 10^12 anti-protons, there are 10^12 protons or neutrons also created. If you want to check on the number of anti-protons in the Tevatron right now, look at
http://www-bd.fnal.gov/notifyservlet/www?project=outside
 

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