Average Momentum of D’s
Pythia 6 has a significantly softer spectra than Pythia 5
- Pythia 6 better match to PK? but a worse match to KK? than Pythia 5
Both the DQ fraction and Q/DQ split influence the P spectra as well.
The HC shower library produces harder spectra than the parameterized version which slightly improves agreement when running Pythia 6