The PARP(77) parameter controls the probability for fast moving strings to reconnect. Higher values correspond to less probability for reconnection. The documentation can be found
here.
The data seems to slightly favor the tuning with the parameter increased, corresponding to lower probability to have color reconnection for fast moving strings.
The naming scheme used for the different tunes is:
77 |
Tune |
0.900 |
AB |
1.016 |
BB |
1.100 |
CB |
The different tunes have been compared to
CMS data for different pseudorapidities:
--
RasmusSlothHansen - 11-Jul-2011