Parma International School on theoretical Physics 2007

MC101

A short introduction to the techniques of Monte Carlo integration. Exercises proposed during lecture are collected in this Mathematica Notebook: mc101.nb​.

Exercises

All exercises proposed here can be "solved" or checked with Software.MadGraph / Software.MadEvent.

Software.MadGraph prolegomena

• Logon to the Software.MadGraph web site and register.

• Familiarize with the code by generating a few processes in QED and QCD trying to guess which diagrams appear. What is the minimum number of jets have to be asked for in collisions so that the triple gauge vertex 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

QCD

• Reference: ​QCD and Collider Physics

by Keith Ellis, James Stirling, Bryan Webber (Cambridge Monographs, 1996).

• Radiation from heavy quarks: the dead cone in .
• Spin of the gluon: Vector vs scalar in the angular correlations of 4 jets.
• Jets : Di-jet kinematics and rates in pp collisions.
• 3 Jets : Energy distributions in 3-jet events.
• top production? : production, Tevatron vs LHC.

EW

• Reference: Lecture notes on the Standard Model and Book, by ​Giovanni Ridolfi.

• $\gamma Z$ interference in .
• Higgs at LEP : the cross section for at LEP2.
• Drell-Yan: rapidity asymmetry at the Tevatron and LHC.
• Spin correlations in top decay, by ​Bryan Webber.

BSM

• On-line ​SUSY LHA file generator by Sabine Kraml.
• Lorenzo Basso's model Software.MadGraph implementation: basso.tar.gz​

LHC Phenomenology

• Analysis routines for LHE and LHCO events:
  • a Fortran-based package: Software.MadAnalysis (​Download it here)
  • a Mathematica-based package: ​Chameleon.
• Kinematics at the LHC: single particle quantities.
• SM Higgs discovery at the LHC: Three important channels
• Simple Black Boxes: New gauge bosons

Challenges

• Black Box #1 : (Signal in various channels. Special trigger here: either at least a lepton or two energetic jets)
  • Events:Parton Level​
  • Plots: Parton level​
• Black Box #2 : (2-lepton trigger stream, ttbar background + signal A and B)
  • A Events​ Plots: Detector level​
  • B Events​ Plots: Detector level​
  • Hint: ​Here you can find a strategy to follow

<!--- * Black Box #3 : Events​ Plots: Detector level​ --->

-- Main.FabioMaltoni - 04 Sep 2007