Firstrun

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For the first run we are going to simulate simple LEP with the default setup and look at the output.

Create a folder with

mkdir herwig-tutorial

and copy the input file LEP.in that you find under /src into that folder.

Then type the following commands in order to simulate 1000 LEP events:

Herwig read LEP.in
Herwig run LEP.run -N 1000

In the next step have a look at the file LEP.log that displays the first 10 events of that run. Each event is made up of individual steps that reflect the treatment of the event as it passes through the various stages of the generator (hard subprocess, parton shower, hadronization and decays). Try to make sense of the numbers displayed and try to find the individual steps in the event record (the LEP.log file).

Since only looking at numbers is tedious and we cannot really learn something from the .log file we now try to compare the simulation with data.

For that purpose we need to modify the LEP.in file and include the following part

read snippets/Rivet.in
insert /Herwig/Analysis/Rivet:Analyses 0 ALEPH_1996_S3486095

before the line 'saverun LEP EventGenerator'