1. WH, H->bb MICHAEL WRIGHT, UNIVERSITY OF GLASGOW

2. INTRODUCTION Optimize University of Glasgow WH analysis by comparing with LMU and Wisconsin MC cut flows. Compare cut flows with the new proposed baseline cuts from 05/04/2011 H->bb meeting. Data sets used: Wenu : mc10_7TeV106043.PythiaWenu_no_filter.merge.NTUP_TOP.e574_s933_s946_r183 5_r1700_p406_tid256551_00 : NTUP_TOP.256551._000487.root.2 Wmunu: mc10_7TeV106044.PythiaWmunu_no_filter.merge.NTUP_TOP.e574_s933_s946_r18 31_r1700_p406_tid256552_00 : NTUP_TOP.256552._000350.root.2 MICHAEL WRIGHT, H->BB, 11/04/2011 2

3. BASELINE CUTS WH, H->bb summer conf baseline cuts can be found here:  https://twiki.cern.ch/twiki/bin/view/AtlasProtected/WHNoteSummer2011#BaseLine_Selecti on https://twiki.cern.ch/twiki/bin/view/AtlasProtected/WHNoteSummer2011#BaseLine_Selecti on New proposed baseline cuts can be found on the Hbb Sharepoint. Main Changes Muons: |eta| < 2.4 from 2.5 pTtrk20/pT < 0.1 from pTtrk20 < 1.8GeV Electrons: |eta| < 2.47 incl. crack from 2.5 excl. crack MET: MET_RefFinal from MET_LocHadTopo Jet: |eta| < 4.5 from 2.5 Jet Cleaning only on Jets with pT > 20 GeV MICHAEL WRIGHT, H->BB, 11/04/2011 3

4. CUT FLOW COMPARISON MC Cut flow Wmunu Wenu ttbar SelectionWisconsinGlasgowWisconsinGlasgowWisconsinGlasgow Initial9998 9995 N Lep > 0575457583777375047614959 Trigger480948123740371343434503 Vertex480948123739371243434503 MET Cleaning 480948053739370943434483 Lepton Veto 480948053739370939423924 MT968 3480345524442430 MET417 2963294622562242 Njet >= 236 55 21702158 Njet = 228 43 417 NBJet = 13311236309 NBJet = 2000073 4

5. NEW BASELINE CUT FLOW COMPARISON MICHAEL WRIGHT, H->BB, 11/04/2011 5 MC Cut flowWmunu SelectionGlasgow (New) Glasgow (old) Initial9998 Author7344 Eta69887225 Pt57675976 Pixel57565962 SCT57315937 SCT/Pixel Holes57285934 b-layer57065912 TRT57005906 Z0/d056875893 Isolation56525799 Mu-jet or56525758 Mu-el56525758 N Lep > 056525758 Trigger47984812 Vertex47984812 MET Cleaning47914805 Lepton Veto47914805 MT4481968 MET3757417 Njet >= 211536 Njet = 29428 NBJet = 183 NBJet = 200

6. MICHAEL WRIGHT, H->BB, 11/04/2011 6 MC Cut flowWenu SelectionGlasgow (New) Glasgow (old) Initial9998 Author7984 IsEM44614694 checkOQ4461 Pt3750 Eta37433750 N Lep > 037433750 Trigger37063713 Vertex37053712 MET Cleaning37023709 Lepton Veto37023709 MT34783455 MET29962946 Njet >= 28355 Njet = 26743 NBJet = 111 NBJet = 200