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Uncertainties and bugs in MMC and MUM

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

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  1. Uncertainties and bugs in MMC and MUM Dmitry Chirkin UC Berkeley

  2. The problem • Propagation of 100 TeV muons through 300 meters of Frejus Rock

  3. Different Bremsstrahlung implementations • In ice/water

  4. Both bremsstrahlung implementations • In Standard Rock/water

  5. Other cross sections • Comparison with MUM

  6. E+- pair production • 5% difference with MUM

  7. All cross sections • Comparison with MUM

  8. The Agreement • Between MMC and MUM

  9. 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.

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