Table of Contents

• What is matching?
• What is merging?
• Important point while using matching
• References

What is matching?

We need to perform matching to avoid the double counting while interfacing the matrix element calculation and the parton shower at a given multiplicity.

What is merging?

Important point while using matching

1. $qCut > p_{T}$
2. Check the Differential Jet Rate (DJR) distribution should be smooth.

References

1. Differential Jet Rate (DJR) details: https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/MatchChecker#no1
2. Plot DJR in CMSSW: https://github.com/cms-sw/genproductions/blob/master/bin/MadGraph5_aMCatNLO/macros/plotdjr.C
3. Matching & Merging: http://home.thep.lu.se/~torbjorn/talks/hcp13ts2.pdf
4. Pythia Jet Matching parameters details: https://pythia.org/latest-manual/MatchingAndMerging.html
5. Tutorial on HiggsPO tool: https://www.physik.uzh.ch/data/HiggsPO/files/HiggsPO_tutorial.pdf
6. Searching for W’ using b-tagging, hadronic taus, and missing energy: https://indico.cern.ch/event/724045/contributions/3004385/attachments/1652996/2644783/Mitchell2018.pdf
7. Matching: how to chose the xqcut value? https://answers.launchpad.net/mg5amcnlo/+question/264266
8. Introduction to jet-parton matching in MG/ME: https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/IntroMatching
9. Merging in Madgraph5 and Pythia8, a brief overview: https://indico.cern.ch/event/333239/contributions/777451/attachments/649911/893775/ERCWorkShop.pdf
10. https://sites.google.com/site/montecarlocms/#TOC-Documentation:
11. MLM FxFx merging scale: https://answers.launchpad.net/mg5amcnlo/+question/403110
12. FxFx merging within aMC@NLO: https://indico.cern.ch/event/221788/ 13.