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Uncertainties and bugs in MMC and MUM. Dmitry Chirkin UC Berkeley. The problem. Propagation of 100 TeV muons through 300 meters of Frejus Rock. Different Bremsstrahlung implementations. In ice/water. Both bremsstrahlung implementations. In Standard Rock/water. Other cross sections.
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Uncertainties and bugs in MMC and MUM Dmitry Chirkin UC Berkeley
The problem • Propagation of 100 TeV muons through 300 meters of Frejus Rock
Different Bremsstrahlung implementations • In ice/water
Both bremsstrahlung implementations • In Standard Rock/water
Other cross sections • Comparison with MUM
E+- pair production • 5% difference with MUM
All cross sections • Comparison with MUM
The Agreement • Between MMC and MUM
Conclusions • MMC e+- pair production cross section was corrected. It was underestimated by 5%, which led to a ~3% error in propagation of 100 TeV muons. • MUM 8-point integration used for e+- cross section has an insufficient precision. • ABB and KKP bremsstrahlung cross section parameterizations differ for hydrogen. KKP is used in AMANDA and the most recent. • All cross sections now agree between MMC and MUM, and differences can be explained.