Early W/Z plus jets ratio measurement as a function of the jet multiplicity and boson pt at CMS
f o c u s
This team is primarily focused on the measurement of the W+jets/Z+jets ratio at CMS startup. The work is centered around early boson selector strategies, early jet selector strategies, early background constituent measurements, systematics (and other) cancellations in the ratio, factorization of the EWK and QCD part of the measurements and use of the EWK part to validate the QCD part. Both electron and muon channels are considered while the work on the tau is seen as a primarily background component. Satellite to the the ratio work e.g. on dimuon-jet balancing for global calibration in the Z to muons channel and in multijet topologies are also included. The work is a major part of the program for searches in all-hadronic topologies with MET in terms of extracting the backgrounds from the data.
All are working closely and each memebr is focusing more on a topic -- to minimize dublication but allow cross-checking and collaboration, as follows:
- muons ratio: Ilaria Segoni (CERN) , Didar Dobur (Pisa), Maurizio Pierini (CERN)
- jets studies: Didar Dobur (standard CMS reco + track jets), Maurizio Pierini (new algos, robustness metric), Thiago Tomei (new algos, gen/rec studies)
- electrons startup selectors: Paolo Meridiani, Emanuele Di Marco, Chiara Roveli (Roma I), Maurizio Pierini (CERN)
- muon startup selectors - initial pass : ditto, and with Marco Zanetti(CERN) on the dimuon-jet balancing
- jets, MET (Calo level inputs, DPG studies) : Chris Rogan (Caltech)
- top startup background (including "quick top"): Michael Tytgat (Ghent) + MA student Carlos Diez Gonzalez, PhD student Lukas Vanelderen
- Z's contibution to W's: (Carlos Diez Gonzalez)
- Validation/cross-validation : all
- e,mu combination: Maurizio Pierini
Team
works and documentation at iCMS (login at iCMS required)
relevant starting notes at iCMS
- EWK group (J. Alcaraz, S. Dasu)
- VecBos+jets representatives to EWK: Ilaria Segoni
- jetMET group (D. Elvira, G. Dissertori)
- VecBos+jets representative to jetMET: Didar Dobur, Chris Rogan, Maurizio Pierini
- e/gamma group (C. Seez, P. Vanlaer)
- VecBos+jets representative to e/gamma: Paolo Meridiani
- VecBos+jets representative to HCAL,ECAL: Chris Rogan,Chiara Roveli, Paolo Meridiani
- VecBos+jets ECAL+HCAL task force: Chris Rogan,Chiara Roveli
- VecBos+jets in SUSY and Exotica (jetMET searches): Chris Rogan, Thiago Tomei, Maurizio Pierini
Primary CMS PAG/POG affiliations
To be updated (mu, tau/PF,TOP)
Other CMS PAG/POG affiliations