​Taller Altas Energías 2008 - Madrid Particle Physics Phenomenology and the LHC ¶

Authors ¶

• Fabio Maltoni (lecturer)
• Claude Duhr (tutor)

Lectures ¶

Find the pdf of the 3 x 1.5 hours lecture:

• Lecture 1​ : QCD at hadron colliders
• Lecture 2​ : SM of EW interactions : SU(2)xU(1), EWSB, the Higgs mechanism
• Lecture 3​ : Higgs, top and BSM phenomenology at the LHC

A brief tutorial on MadGraph / MadEvent can be found here​.

References ¶

• Lecture 1 : ​QCD and Collider Physics by Keith Ellis, James Stirling, Bryan Webber (Cambridge Monographs, 1996).
• Lecture 2 : "Standard Model of electroweak interactions", by A. Pich, ​[hep-ph/0502010].
• Lecture 3 : Perspectives on LHC physics, Ed. by G. Kane and A. Pierce.

Answers to some of the questions asked during lecture can be found here.

Tests and Exercises ¶

The following tests help to understand the lectures better, and to prepare for the exercises related to the different lectures:

• Test for lecture 1.
• Test for lecture 2.

A pdf with the exercises related to the lectures can be found here​.
Some of the exercises proposed can be "solved" or checked with MadGraph / MadEvent.

Introduction to hadron collisions ¶

• Kinematics at the LHC: single particle quantities.
• Jets : Di-jet kinematics and rates in pp collisions.
• 3 Jets : Energy distributions in 3-jet events.
• Drell-Yan : Study the rapidity asymmetry at the Tevatron.

Higgs and top ¶

• Higgs : Higgs phenomenology at hadron colliders.
• top production : $t \bar t$ production, Tevatron vs LHC.

New Physics ¶

• t' production : $t'$ production at the LHC.
• New resonances: Discover new resonances at the LHC.

Animations ¶

• ​Interactive Flash version Note you may want to zoom in!
• ​Fast movie (.avi) of collision
• ​Guided movie (.mov) of collision

Familiarize with MadGraph ¶

• Logon to the MadGraph web site and register: ​http://madgraph.hep.uiuc.edu.

• Familiarize with the code by generating a few processes in QED + QCD trying to guess which diagrams appear.

• Look at the new physics models and check the particle and interactions content.

• Generate events for a few selected processes and look at the plots:
  • ttbar production with decays: pp>tt~>bb~mu+e-ve~vm
  • VV production: pp>VV> leptons, with V=Z,W.
  • Single top + Higgs: pp>tHj (QCD=0, QED=3, j=gudsc,p=gudscb). Show that there is a large negative interference between the diagrams.

Analysis Tools ¶

• a Fortran-based package: MadAnalysis (​Download it here)
• a Mathematica-based package: ​Chameleon.

MC101 ¶

For those interested in Monte Carlo techniques, here are some exercises:

• Write the simplest integration function based on the definition of average and error
• Importance sampling via an analytic transformation
• Von Neumann's rejection method : plain and improved
• Phase space for 1 -> n particles
• Vegas
• Top decay : comparison among the various methods
• qq -> tt production

All exercises are presented and solved this Mathematica Notebook: mc101.nb​. Reference: ​Introduction to MC methods, by ​Stefan Weinzierl

-- Main.FabioMaltoni - 29 Aug 2008