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M I C H A E L W R I G H T , H - > B B , 1 1 / 0 4 / 2 0 1 1

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_r1835_r1700_p406_tid256551_00 : NTUP_TOP.256551._000487.root.2

Wmunu:

mc10_7TeV106044.PythiaWmunu_no_filter.merge.NTUP_TOP.e574_s933_s946_r1831_r1700_p406_tid256552_00 : NTUP_TOP.256552._000350.root.2

2

M I C H A E L W R I G H T , H - > B B , 1 1 / 0 4 / 2 0 1 1

BASELINE CUTS

• WH, H->bb summer conf baseline cuts can be found here:

https://twiki.cern.ch/twiki/bin/view/AtlasProtected/WHNoteSummer2011#BaseLine_Selection

• 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

3

CUT FLOW COMPARISONMC Cut flow

Wmunu Wmunu

Wenu Wenu ttbar ttbar

Selection Wisconsin

Glasgow Wisconsin

Glasgow Wisconsin

Glasgow

Initial 9998 9998 9998 9998 9995 9995

N Lep > 0

5754 5758 3777 3750 4761 4959

Trigger 4809 4812 3740 3713 4343 4503

Vertex 4809 4812 3739 3712 4343 4503

MET Cleaning

4809 4805 3739 3709 4343 4483

Lepton Veto

4809 4805 3739 3709 3942 3924

MT 968 968 3480 3455 2444 2430

MET 417 417 2963 2946 2256 2242

Njet >= 2

36 36 55 55 2170 2158

Njet = 2 28 28 43 43 417 417

NBJet = 1 3 3 1 1 236 309

NBJet = 2

0 0 0 0 73 73

4

M I C H A E L W R I G H T , H - > B B , 1 1 / 0 4 / 2 0 1 1

NEW BASELINE CUT FLOW COMPARISON

5

MC Cut flow Wmunu Wmunu

Selection Glasgow(New)

Glasgow (old)

Initial 9998 9998

Author 7344 7344

Eta 6988 7225

Pt 5767 5976

Pixel 5756 5962

SCT 5731 5937

SCT/Pixel Holes 5728 5934

b-layer 5706 5912

TRT 5700 5906

Z0/d0 5687 5893

Isolation 5652 5799

Mu-jet or 5652 5758

Mu-el 5652 5758

N Lep > 0 5652 5758

Trigger 4798 4812

Vertex 4798 4812

MET Cleaning 4791 4805

Lepton Veto 4791 4805

MT 4481 968

MET 3757 417

Njet >= 2 115 36

Njet = 2 94 28

NBJet = 1 8 3

NBJet = 2 0 0

M I C H A E L W R I G H T , H - > B B , 1 1 / 0 4 / 2 0 1 1 6

MC Cut flow Wenu Wenu

Selection Glasgow(New)

Glasgow (old)

Initial 9998 9998

Author 7984 7984

IsEM 4461 4694

checkOQ 4461 4461

Pt 3750 3750

Eta 3743 3750

N Lep > 0 3743 3750

Trigger 3706 3713

Vertex 3705 3712

MET Cleaning 3702 3709

Lepton Veto 3702 3709

MT 3478 3455

MET 2996 2946

Njet >= 2 83 55

Njet = 2 67 43

NBJet = 1 1 1

NBJet = 2 0 0