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“ Drell-Yan process & parton shower ”. V MCnet network meeting. U pdates of my work. Luca D’ Errico. Durham, 15 January 2009. Plan. Introduction S tatus of my work Summary and outlook of my studies. Why Drell-Yan process ?. Process-parton shower interface

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v mcnet network meeting

“Drell-Yanprocess & partonshower”

VMCnet network meeting

Updatesofmy work

Luca D’ Errico

Durham, 15 January 2009

slide2
Plan
  • Introduction
  • Statusofmy work
  • Summary and outlookofmystudies
slide3

WhyDrell-Yanprocess?

  • Process-partonshower interface
  • Startingwitheasiestprocess
  • Implementit in C++
  • Useown code
  • Integrate it in Herwig++
drell yan process
Drell-Yanprocess

IIR divergences

catani seymour subtraction method i
Catani-Seymoursubtractionmethod I

hep-ph/9605323

General idea:

slide6

Hastoexactly match the singularbehaviourofrealterm

  • Hastobeintegrableanalyticallyover the single partonsubspaceleading IR divergences
  • Hastobeconvenientfor MC integration
  • Isconstructed in a way thatisprocessindipendent

The counterterm:

dipoles for drell yan process
DipolesforDrell-Yanprocess

Checkedbyhandthatthesedipolescancel the singularbehaviourof cross section at NLO!

lo drell yan subprocesses
LO Drell-Yansubprocesses

Completelyimplemented at NLO

  • Take care ofpossibleinterferenceterm
  • Characterisecompletely the massivefinalstates
  • Randomnumbergenerator and phasespacegenerator
  • Cuts: Rapidity and Lego Plot Separation

The subprocesseshavebeenstudiedbyhand!

once the code is done
Once the code isdone

Fixed a subprocess:

  • Debug it at LO
  • Implement LO-code in ThePEG
  • Checks
  • Debugit at NLO
  • ImplementNLO-code in ThePEG
  • Checks
  • Matching
debug
Debug

Fixedsubprocess:

implementation as thepeg me
ImplementationasThePEG ME

MEBase

2->2 PSG

2->3 PSG

LO ME

NLO ME

summary and outlook
Summary and outlook
  • QCD Phenomenology
  • Monte Carlo Method
  • C++ structures
  • External Herwig++ libraries (LHAPDF, CLHEP )
  • Root
  • Debug (Checksbyhand, HELAC)
  • ThePEG (MEBase, ME2to2Base, …)
  • Interfacemy code with Simon’sshower
  • Otherprocesses (VBF)
long term outlook
Long termoutlook
  • Becomefamiliarwithsuch interface
  • Deal with more complicate processes
  • Write interface forgeneralmatrixelement
ad