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 %$e^+e-$% 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).

• [:DeadCone:Radiation from heavy quarks]: the dead cone in %$e^+e- \to Q \bar Q g$%.
• [:GluonSpin:Spin of the gluon]: Vector vs scalar in the angular correlations of %$ e^{+ e}- \to$% 4 jets.
• [:2Jets:Jets] : Di-jet kinematics and rates in pp collisions.
• [:3Jets:3 Jets] : Energy distributions in 3-jet events.
• [:tt:top production] : %$t \bar t$% production, Tevatron vs LHC.

EW

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

• [:GammaZ:%$\gamma Z$% interference] in %$e^+e- \to \mu^{+ \mu}-$%.
• [:HiggsLep:Higgs at LEP] : the cross section for %$e^+e- \to ZH$% at LEP2.
• [:WAsymm:Drell-Yan]: rapidity asymmetry at the Tevatron and LHC.
• [:TopDecaySpinCorrelations: 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.
• [:SimpleKinematics:Kinematics at the LHC]: single particle quantities.
• [:DiscoverTheHiggs:SM Higgs discovery at the LHC]: Three important channels
• [:WarmingUpChallenge: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