Madgraph sample validation plots

Below you can find a series of plots made using the MatchChecker tool from Madgraph for the private samples used for our study. They show the smooth distributions for the differential jet rate around the cut used in phase space for the matching of jets (). The phase space cut defines the:

• low- region where parton showers are responsible for generating jets (radiation)
• and the high- region where the matrix elements are responsible for generating the jets.

While clustering the partons, the maximum distance at which 2 jets are still resolved as 2 jets is called the differential rate for 2-jet to 1-jet configuration. In general the differential jet rate is the maximum distance at which an event switches from N-jet to N-1 jet configuration when the clustering of partons takes place. The plots shown below were obtained using virtuality ordered shower generation. In the full report, below one can take a look to the differences between this results and the ones obtained using odered shower generation.

Differential jet rate
tt~		Hardest jet

• FullValidationReport.ps: Validation report from MatchChecker, contains many kinematics distributions obtained from samples.

-- PedroSilva - 02 Apr 2008