[Rivet-svn] r3871 - schools/2012-CERN/handouts/day2

[blackhole at projects.hepforge.org]

Author: dgrell
Date: Wed Jul 25 12:25:39 2012
New Revision: 3871

Log:
Hw DONE

Modified:
   schools/2012-CERN/handouts/day2/Hw-day2.tex

Modified: schools/2012-CERN/handouts/day2/Hw-day2.tex
==============================================================================
--- schools/2012-CERN/handouts/day2/Hw-day2.tex	Wed Jul 25 12:23:19 2012	(r3870)
+++ schools/2012-CERN/handouts/day2/Hw-day2.tex	Wed Jul 25 12:25:39 2012	(r3871)
@@ -49,22 +49,22 @@
   ls
 \end{verbatim}
 
-You will find three different input files named {\tt TVT-0jet.dat,
-TVT-1jet.dat} and {\tt TVT-Powheg.dat}; they all load {\tt
+You will find three different input files named {\tt 0jet.in,
+1jet.in} and {\tt Powheg.in}; they all load {\tt
 Base.in}. Take a look at the files. In
 particular, look at the matrix element setup, where either the regular
 $Z$ ME or the $Z$+jet ME is selected. The Powheg ME gives an NLO
-description of the same process. Also inspect the Handler settings, which
-disable the shower. We are running four different Rivet analyses, to
+description of the same process. Also inspect the Evolver settings in {\tt Base.in}, which
+disable the shower. We are running two different Rivet analyses, to
 compare the setups.
 Once you have checked the setup, run Herwig using the commands
 below. You can also share out longer runs among your group.
 \begin{verbatim}
-  Herwig++ read TVT-....in
-  Herwig++ run TVT-....run -N 50000
+  Herwig++ read ....in
+  Herwig++ run ....run -N 50000
 \end{verbatim}
-Here you should replace {\tt TVT-...} with the name of the input file to
-run. After the runs, compare the process cross-section from the {\tt .out}
+Here you should replace {\tt ...} with the name of the input file to
+run. After the runs, compare the process cross-sections from the {\tt .out}
 files.
 
 \subsection{Plotting your Results}
@@ -101,17 +101,23 @@
 with the perturbation order, so it is not realistically possible to
 calculate high-multiplicity events using purely this method.
 
-The parton shower describes the soft and collinear emissions from final
-state partons by resumming the leading logarithmic terms. However, as
-the non-leading terms are neglected, the parton shower does not describe
-hard or wide-angled parton emission well.
-
-Therefore, the multi-jet phase space is separated into two regions, with
-the hard, wide-angled emissions described by the matrix element, and the
-soft, collinear emissions described by the parton shower. Herwig does
-not yet include a mechanism for merging arbitrary multi-jet matrix
-elements with the parton shower. This will be included in a coming
-release. To better simulate the leading jet, a hard ME correction is
+The parton shower describes the soft and collinear emissions from
+final state partons by resumming the leading logarithmic
+terms. However, as the non-leading terms are neglected, the parton
+shower does not describe hard or wide-angled parton emission
+well. Therefore, the multi-jet phase space is separated into two
+regions, with the hard, wide-angled emissions described by the matrix
+element, and the soft, collinear emissions described by the parton
+shower.
+
+Herwig has recently included a new mechanism for merging arbitrary
+multi-jet matrix elements with the parton shower, called
+\emph{Matchbox}. For today's tutorial we'll not use this
+functionality, though, and concentrate on the older method, which is
+still the default\footnote{If you'd like to know more about Matchbox, please
+contact Simon Pl\"atzer at DESY.}.
+
+To better simulate the leading jet, a hard ME correction is
 implemented for several processes, including the Drell-Yan process we
 are looking at.
 
@@ -123,7 +129,9 @@
 
 \subsection{Running Herwig++}
 
-Within your group, decide which runs you will prepare.
+Within your group, decide which runs you will prepare. They will take
+significantly longer than in the previous section, as we run the full
+event simulation this time.
 
 The setups can be found in the directory named \url{~/school/day2/herwig/shower}.
 All now have the full generation chain of
@@ -133,25 +141,21 @@
   Take a look at the input files, and once you have checked the
   setup, run Herwig using the commands below.
 \begin{verbatim}
-  Herwig++ read TVT-....in
-  Herwig++ run TVT-....run -N 10000
+  Herwig++ read ....in
+  Herwig++ run ....run -N 10000
 \end{verbatim}
 
 \subsection{Plotting your Results}
 
 Collect results from other members of your group by copying all relevant `.aida' files to a common directory.
 
-To plot your results, enter the following two commands:
+To plot your results, enter the following two commands, just as before:
 
 \begin{verbatim}
   rivet-mkhtml *.aida
   firefox plots/index.html &
 \end{verbatim}
 
-\noindent You can also look at the .pdf files directly using, for example, the
-command \\ {\tt mupdf plots/ATLAS\_2011\_S9131140/d01-x01-y02.pdf} etc.
-
-
 \section{QED Radiation}
 
 \subsection{Physics}
@@ -192,8 +196,8 @@
 run Herwig using the commands:
 
 \begin{verbatim}
-  Herwig++ read TVT-0jets-QED-....in
-  Herwig++ run TVT-0jets-QED-....run -N 10000
+  Herwig++ read 0jets-QED-....in
+  Herwig++ run 0jets-QED-....run -N 10000
 \end{verbatim}
 
 where {\tt ...} is either `on' or `off'. In addition to the  {\tt
@@ -210,7 +214,7 @@
 their own:
 
 \begin{verbatim}
-  ./extract_noclus.sh TVT-0jets-QED-off.aida TVT-0jets-QED-on.aida
+  ./extract_noclus.sh 0jets-QED-off.aida 0jets-QED-on.aida
 \end{verbatim}
 
 Now you can create the plots as usual: