SchoolKias/MadGraph: tuto_mg.tex

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3\documentclass[article]{jHEP3}
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28
29\title{MadGraph Tutorial at KIAS}
30
31\author{Olivier Mattelaer$~^{a,b}$\\
32$^a$ Centre for Cosmology, Particle Physics and Phenomenology (CP3) \\
33Universit\'{e} Catholique de Louvain\\
34Chemin du Cyclotron 2, B-1348 Louvain-la-Neuve, Belgium\\
35$^b$ Fond national de la Recherche Scientifique (FNRS),\\
36Rue D'egmont 2\\
37100 Bruxelles, Belgium\\ 
38E-mails: \email{
39olivier.mattelaer@uclouvain.be}
40}
41
42
43\abstract{}
44
45
46\begin{document}
47\newpage
48
49\section{Initiation to MadGraph}
50
51The purpose of this section is that you learn the basic command of the mg5 interface.
52In order to do so. Go to the directory when you install mg5, launch it,  type "tutorial"
53and follow instructions.
54\begin{verbatim}
55$ ./bin/mg5
56mg5> tutorial
57\end{verbatim}
58
59\section{Masterize the Madgraph generation}
60
61The purpose of this section, is to masterize the creation of diagram.
62For this exercise, first draw (BY HAND) the diagram and then compare
63with MadGraph5.
64
65\begin{itemize}
66\item $ u \bar u > t \bar t$
67\item $ g g > t \bar t$ with the semi-leptonic decay.
68\item $ g g > t \bar t h$ use sm model and heft model.
69 
70For this process, answer the following questions:
71\begin{itemize}
72   \item What's the differences between this model and the sm one.
73   \item What's the motivation for such model? What is the validity for such model?
74\end{itemize}
75\item $ u u~ > t \bar t b \bar b $
76\end{itemize}
77
78\section{Competition}
79
80The first to finish a generation wins some chocolate.
81The process will be given on the board.
82
83
84\section{How to Compute cross-section}
85
86The purpose of this section is to understand what are the different parameters used by MadGraph/Madevent in order to
87compute a cross-sections/generate events.
88
89\begin{itemize}
90\item create a process for madevent (for example):
91\begin{itemize}
92     \item $mg5> generate\ p p > e^+ ve j$
93     \item $mg5> output\  KIAS\_EXAMPLE$
94\end{itemize}
95and read the following files:
96\begin{itemize}
97\item KIAS\_EXAMPLE/Cards/param\_card.dat
98\item KIAS\_EXAMPLE/Cards/run\_card.dat
99\item KIAS\_EXAMPLE/Cards/pythia\_card\_default.dat
100\item KIAS\_EXAMPLE/Cards/pgs\_card\_default.dat
101\end{itemize}
102Note all your questions, and after  we will discuss together the meaning of all those parameters.
103\end{itemize}
104
105
106\section{Compute your first cross-section}
107
108The purpose of this part is to make a first generation and to start to do physics with it.
109The idea is to make a generation and understand the various behavior presented in the
110various distributions.
111
112For this, by group, take one process and compute the cross-section
113for the LHC and for the Tevatron.
114\begin{itemize}
115\item Compare the two results, explain why you have such result.
116\item Look at the various distributions. Why looking at such variable?
117\item Do you expect such results?
118\item How this is different of the bkg? (which background?)
119\item All the question that you will have.
120\end{itemize}
121
122The proposed processes are the following
123\begin{itemize}
124\item $ p p > t t~ $ with a given decay.
125\item $ p p > l+ vl $
126\item $ p p > l+ l-$
127\item $ p p > H$ Higgs decaying in two W and the W in lepton.   
128\end{itemize}
129 
130\section{Signal + Background Phenomenology}
131
132The purpose of this study is to make a full chain analysis including shower/ hadronization/ basic detector reconstruction.
133And search how such process can be observed.
134
135Generate one of the two following process
136\begin{itemize}
137\item $ p p > H$ Higgs decaying in two W and the W in lepton.
138\item $ p p > t \bar t h$ with semi leptonic decay of the top.
139\item $ p p > sl \bar{sl} $ decaying in lepton neutralino.
140\end{itemize}
141
142Some of the questions that you should ask yourself
143\begin{itemize}
144\item How do I distinguish the signal from the background? (at parton level and reconstructed level)
145\item How do I measure the mass of the new particles? 
146\item How do I measure the spin of the new particles?
147\item How do I treat the background?
148\item For which spectrum in mass, this might be interesting to discover the particles?
149\end{itemize}
150
151\section{Analyzing some unknown sample}
152
153At the LHC, we don't know the theory in advance. So finding the correct theory is not trivial.
154In this exercice, you will receive distributions for $ p p > X$ with full decay. Your job is to
155find what is $X$, what is the mass of $X$, the properties of $X$, ...
156
157You will find the sample here:
158\begin{itemize}
159\item http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/CernSummerSchool08/A.pdf
160\item http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/CernSummerSchool08/B.pdf
161\item http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/CernSummerSchool08/C.pdf
162\end{itemize}
163
164In order to make the exercise more easy, this is the three scenarios:
165\begin{itemize}
166\item Higgs
167\item $W' $
168\item $Z'$
169\end{itemize}
170
171If you need some help, the same process at parton level are more easy to distinguish and more
172easy to analyze:
173\begin{itemize}
174\item http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/CernSummerSchool08/A-lhe.pdf
175\item http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/CernSummerSchool08/B-lhe.pdf
176\item http://cp3wks05.fynu.ucl.ac.be/twiki/pub/Physics/CernSummerSchool08/C-lhe.pdf
177\end{itemize}
178
179
180\end{document}
181