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2011 VUB Francqui Chair: LHC Phenomenology
Title
LHC phenomenology: a journey from standard model measurements to new physics discoveries
Authors
Fabio Maltoni (lecturer)
Lectures
Find the pdf of the 5 lectures:
- Public Lecture : An expedition to the TeraWorld : challenges and opportunities at the LHC
- 1st and 2nd Lecture : QCD at work: simulating events at the LHC
- 3nd Lecture : Precision physics and BEH boson phenomenology
- 4th Lecture : The importance of being top & Hunting for New Physics
References
- QCD and Collider Physics by Keith Ellis, James Stirling, Bryan Webber (Cambridge Monographs, 1996).
- [:FurtherReading:Perspectives on LHC physics, Ed. by G. Kane and A. Pierce].
Higgs notebooks
- pp>H at LO (1-loop): details of the calculation (Mathematica Notebook) HiggsGG-LO-mtfinite.nb
- pp>H at NLO: details of the calculation (Mathematica Notebook) higgsGG-NLO.nb
- pp>H at NLO: cross section evaluation for the LHC (Mathematica Notebook+PDF libraries to be compiled) phenHiggs.tar.gz.
A summary of the results can be found in Higgs.pdf.
MC Exercises
Basics : MC101
A short introduction to the techniques of Monte Carlo integration. Exercises proposed during lecture are collected in this Mathematica Notebook: mc101.nb.
Basic exercises 1: Familiarize with Software.MadGraph
- Logon to the Software.MadGraph web site and register: http://madgraph.hep.uiuc.edu.
- Register with a valid e-mail address
- Feynman diagrams. Generate a few processes (with different QED + QCD couplings) trying to guess which diagrams appear:
- uu~>tt~
- gg>tt~
- gg>tt~h (in SM and HEFT)
- uu~>tt~bb~
- Subprocess identification. List all subprocesses contributing to:
- pp>l+vljj
- pp>tt~bb~
- pp>tt~jj
- Look at the new physics models and check the particle and interactions content.
- Advanced: Download the MG/ME package and play with the standalone version.
Basic exercises 2: Calculate cross sections and generate events
- Generate events for a few selected processes (work in groups, pick one each), for Tevatron and LHC energies. Does the cross section scale as you expect?
- Compare cross sections with the processes of your neighbors. Do they differ as you would expect?
- Look at the generated plots. Are the distributions as you would expect? Discuss with your neighbors.
Example processes:
- ttbar production: pp > tt~, QED=0
- W production: pp > l+vl
- Z/gamma* production: pp > e+e-
- g g > (H > e+ ve mu- vm~) (in HEFT model)
- p p > (W+>e+ ve) (W- > mu- vm~) (important background to previous process)
Advanced exercises 1: The full simulation chain and advanced features
Try out the Analysis Tools:
- a Fortran-based package: Software.MadAnalysis (Download it here)
- a Root-based package: Software.ExRootAnalysis (Download it here)
- a Mathematica-based package: Chameleon
Study SM Higgs production at the LHC. Choose a channel and investigate signal and background, using either of the packages above:
- The 2 lepton + missing Et final state: %$ pp \to H\to W+ W- \to e- \bar \nu_e \mu+ \nu_\mu $%
-
- Signal
- Signal
Detector Level |
Detector Level |
- Background
</span>Detector Level |
</span>Detector Level |
- Top associated production %$pp \to t\bar tH$% with %$H \to b \bar b$%
- Signal + Background samples:
- Signal + Background samples:
Detector Level |
Detector Level |
Advanced exercises 2: Implementation of a new model in Software.MadGraph or FeynRules + Software.MadGraph
Note that for these exercises you need to download the MadGraph/MadEvent package (or MadGraph 5 package) and work locally. You need a Fortran compiler (and for MadGraph 5, Python v. 2.6 or 2.7).
For FeynRules download and information, see the FeynRules wiki
- Implement a (part of a) Standard Model extension into Software.MadGraph, specific for studying a given process. Generate events, study relevant distributions.
- Determine most relevant Standard Model backgrounds with identical final states (“non-reducible”). If not too complicated, generate backgrounds with cuts determined from signal distributions.
- Which other (“reducible”) backgrounds might be important?
- Can the signal be seen at Tevatron? At the LHC?
Animations
- Interactive Flash version Note you may want to zoom in!
- Fast movie (.avi) of collision
- Guided movie (.mov) of collision
- John Ellis on Daily Show
-- Main.FabioMaltoni - 2011-03-25
Attachments (21)
- hww-signal.lhe.gz (12.3 MB ) - added by 12 years ago.
- hww-signal-lhe.pdf (63.6 KB ) - added by 12 years ago.
- hww-background.lhe.gz (11.5 MB ) - added by 12 years ago.
- hww-background-lhe.pdf (63.5 KB ) - added by 12 years ago.
- ttbb.lhe.gz (1.4 MB ) - added by 12 years ago.
- ttbb-lhe.pdf (109.2 KB ) - added by 12 years ago.
- VUB-francqui-public.pdf (8.2 MB ) - added by 12 years ago.
- Francqui-1.pdf (7.1 MB ) - added by 12 years ago.
- Francqui-2.pdf (2.8 MB ) - added by 12 years ago.
- Francqui-4.pdf (9.1 MB ) - added by 12 years ago.
- HiggsGG-LO-mtfinite.nb (12.4 KB ) - added by 12 years ago.
- HiggsGG-NLO.nb (38.8 KB ) - added by 12 years ago.
- phenHiggs.tar.gz (243.1 KB ) - added by 12 years ago.
- Higgs.pdf (171.0 KB ) - added by 12 years ago.
- mc101.nb (318.9 KB ) - added by 12 years ago.
- hww-signal.lhco.gz (3.1 MB ) - added by 12 years ago.
- hww-signal-lhco.pdf (442.8 KB ) - added by 12 years ago.
- hww-background.lhco.gz (2.6 MB ) - added by 12 years ago.
- hww-background-lhco.pdf (445.5 KB ) - added by 12 years ago.
- ttbb.lhco.gz (1.5 MB ) - added by 12 years ago.
- ttbb-lhco.pdf (363.9 KB ) - added by 12 years ago.