The first MadAnalysis 5 workshop on LHC recasting @ Korea

Analysis 4: CMS-SUS-16-041

Students	Byeonghak Ko (Analysis Webpage Editor), Tae Gyu Ro, Jubin Park, Kyeongpil Lee
Supervisor(s)	Guillaume Chalons

1. Analysis summary

Search for new physics n events with at least 3 electrons or muons and jets. Results are based on 35.9 fb^-1 Luminosity at 13 TeV collected by CMS. Events are classified according to the number of b jets, missing transverse momentum, hadronic transverse energy, and the invariant mass of opposite-charge, same-flavor dilepton pairs. Exclusion limits are set for 4 different simplified SUSY models with gluino or 3^rd gen. squarks pair production.

2. Analysis global information

• CMS contact person: cms-pag-conveners-susy@…
• Center of mass energy: 13 TeV
• Integrated luminosity: 35.9 fb^-1
• Link to arXiv: /
• Link to the collaboration page: ​http://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/SUS-16-041/index.html
• Link to CDS: ​http://cds.cern.ch/record/2256435?ln=en
• Link to Inspire: /
• Other useful links...

3. Selection description

3.1 Trigger selection

Trigger selections target di- and multilepton events.

One trigger set requires:

• The two leptons required to meet the loose isolation criteria
• Leading lepton has pT > 23 GeV
• Sub-leading lepton has pT > 8 (12) GeV in the case of muons (electrons)

Second set of triggers requires:

• pT > 8 GeV for both leptons
• HT (hadronic activity) > 300 GeV

PS: This part cannot usually be described by the fast-simulation of detector.

3.2 Object definition

• Jets:
  • clustered with anti-kt algorithm with Delta R = 0.4
  • pT > 30 GeV
  • | eta | < 2.4

• B-jets:
  • b-tag efficiency 70%
  • misidentification probability of 10% and 1% is for c- and light-flavor jets, respectively.
  • pT > 25 GeV & | eta | < 2.4

• Hadronic activity
  • HT = Sum pt of the jets where all jets have pt > 30 GeV

• Muon: | eta | < 2.4

• Electrons: | eta | < 2.5

Explained here how the objects are defined.

3.3 Cut-flow chart

3.4 Definition of exotic observables

Like SUSY transverse observable. Notice that classical MT2 & MT2W are encoded within the MadAnalysis framework.

4. Detector simulation

Can we use the last release of the Delphes package with the CMS/ATLAS MA5tune-card? or do need to improve the simulation?

5. Validation material

Contact with CMS established. Waiting for the validation material requested

5.1 Monte-Carlo samples

• LO/NLO? LO
• Model used: gluino -> t t +LSP, gluino -> q qbar chi_2/chi_1^±
• MC generator program (name + version): PYTHIA 8.???
• Shower program (name + version): PYTHIA 8.???
• Tune of Pythia: ???
• PDF set:
• ME/PS merging????

5.2 Reference plots / cut-flows

• List of validation material

• Two outflows for gluino pair production

6. Validation results

7. Reinterpretation (optional)

8. Questions / issues

9. Analysis People Contacts

• Guillaume Chalons: [mail:guillaume.chalons@th.u-psud.fr]
• Byeonghak Ko: [mail:quark2930@hotmail.com]
• Tae Gyu Ro: [mail:shxorb234@gmail.com]
• Jubin Park: [mail:honolov77@gmail.com ]
• Kyeongpil Lee: [mail: kplee@cern.ch]