Outline Jet-veto sf and uncertainties Effects of Jet smearing on met

Outline

• Jet-veto SF and uncertainties

• Effects of Jet smearing on MET

• MET with/without METUtility

• WW/top/tautau background uncertainties

SF =ZZ(data)/ ZZ(MC) = Z(data)/Z(MC)

• SF =ZZ(data)/ ZZ(MC) = Z(data)/Z(MC)

• Control samples:

• Data (p833, 4.7 fb-1) Z ee and Z mm

• MC (MC11C): Z ll

• MC@NLO/Herwig, ALPGEN, PYTHIA

• Systematic uncertainties

• Parton showing modeling (with diff. MC generator)
• JES/JER (using ATLAS package to smear jet ET)

SF = 0.96 (both for ee and for mm) from MC@LNO Z MC

• SF = 0.96 (both for ee and for mm) from MC@LNO Z MC

•  compared to WW analysis: SF = 0.963

• Systematic uncertainty

• < 0.3% due to JES/JER
• ~ 5% due to different MC generator (Alpgen gives SF = 1.00; Pythia gives SF = 1.02)

Jet smearing effects on MET:ee

Jet smearing effects on MET:mm

MET with METUtility:ee

MET with METUtility:mm