Jets+met Triggers SM Higgs boson search in the HZ bb final state
Jets+MET @ 10TeV
description
Transcript of Jets+MET @ 10TeV
ATLAS SUSY meeting- MET signatures subgroup, 24 Sept’08 -
Jets+MET @ 10TeV
Alan Barr, Claire Gwenlan (Oxford)
- initial look at the two- and three-jets+MET (CSC-style) analyses with 10pb-1 -
Outline MC samples/selection cuts initial results summary/future work
Jets+MET at 10TeV with 10pb-1 24 Sept'08 2
MC samples/selection cuts
Cuts: [two-/three-jet+MET analyses @ 10TeV, with 10pb-1]• look at “loose”, “medium” and “tight” phase space cuts (see below)
– [as proposed by S. Caron: http://indico.cern.ch/conferenceDisplay.py?confId=38731]
• [other cuts as in CSC note 5 (for now; see backups for full list) ]
tight medium loosetwo-jet pT > 200,80 GeV pT > 180,50 GeV pT > 120,40 GeV
three-jet
pT > 100,50,50 GeV
pT > 100,40,40 GeV
pT > 80,40,40 GeV
MC samples:
• v12 fullsim samples, as used in CSC note 5 (full list in backups)• these samples generated at 14TeV -> reweight PDFs to 10TeV
[as described: http://indico.cern.ch/conferenceDisplay.py?confId=33528 (C. Gwenlan) ]
MET>80 GeV in all cases
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Results (i): Meff
two-jet+MET [all cuts incl. J70_XE70 trigger]
S/sqrt(B) [max.]
S/sqrt(S+B)
[max.]loose 21 12
medium 19 10tight 18 9
10TeV, 10pb-
1
Jets+MET at 10TeV with 10pb-1 24 Sept'08 4
Results (ii): Meff
S/sqrt(B) [max.]
S/sqrt(S+B)
[max.]loose 26 13
medium 26 12tight 25 12
10TeV, 10pb-
1three-jet+MET [all cuts incl. J70_XE70 trigger]
Jets+MET at 10TeV with 10pb-1 24 Sept'08 5
Results (iii): MT2
Jets+MET at 10TeV with 10pb-1 24 Sept'08 6
Results (iv): MT2
Jets+MET at 10TeV with 10pb-1 24 Sept'08 7
summary/future work
in principle, light SUSY discoverable with 10pb-1 at 10TeV
… IF enough statistics (and sufficient understadning of the detector!) to determine backgrounds to resonable precision
Next steps:
- background determinations
- trigger studies
Jets+MET at 10TeV with 10pb-1 24 Sept'08 8
Extras
Jets+MET at 10TeV with 10pb-1 24 Sept'08 9
MC samples (backgrounds)QCD J4 trig1_misal1_mc12.008090.pythia_J4_Nj2_FMET100.recon.AOD.v12000601
QCD J5 trig1_misal1_mc12.008091.pythia_J5_Nj2_FMET100.recon.AOD.v12000601
QCD J6 trig1_misal1_mc12.008092.pythia_J6_Nj2_FMET100.recon.AOD.v12000601
QCD J7 trig1_misal1_mc12.008093.pythia_J7_Nj2_FMET100.recon.AOD.v12000601
QCD J8 trig1_misal1_mc12.008094.pythia_J8_Nj2_FMET100.recon.AOD.v12000601
Zee trig1_misal1_mc12.008094.pythia_Zee_qg_ckin80_Nj2.recon.AOD.v12000601
Zmumu trig1_misal1_mc12.008095.pythia_Zmumu_qg_ckin80_Nj2.recon.AOD.v12000601
Ztautau
trig1_misal1_mc12.008091.pythia_Ztautau_qg_ckin80_Nj2.recon.AOD.v12000601
Znunu trig1_misal1_mc12.008090.pythia_Znunu_qg_ckin80_Nj2.recon.AOD.v12000601
Wenu trig1_misal1_mc12.008270.pythia_Wenu_qg_ckin80_Nj2.recon.AOD.v12000601
Wmunu trig1_misal1_mc12.008271.pythia_Wmunu_qg_ckin80_Nj2.merge.AOD.v12000605
Wtaunu trig1_misal1_mc12.008271.pythia_Wtaunu_qg_ckin80_Nj2.merge.AOD.v12000605
TTbar trig1_misal1_mc12.005204.TTbar_FullHad_McAtNlo_Jimmy.recon.AOD.v12000601
T1 trig1_misal1_mc12.005200.T1_McAtNlo_Jimmy.recon.AOD.v12000601
WW trig1_misal1_mc12.005985.WW_Herwig.recon.AOD.v12000601
ZZ trig1_misal1_mc12.005986.ZZ_Herwig.recon.AOD.v12000601
WZ trig1_misal1_mc12.005987.WZ_Herwig.recon.AOD.v12000601
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MC samples (signal)
SU1 trig1_misal1_csc11.005401.SU1_jimmy.susy.recon.AOD.v12000601
SU2 trig1_misal1_csc11.005402.SU2_jimmy.susy.recon.AOD.v12000601
SU3 trig1_misal1_csc11.005403.SU3_jimmy.susy.recon.AOD.v12000601
SU4 trig1_misal1_csc11.006400.SU4_jimmy.susy.recon.AOD.v12000601
SU6 trig1_misal1_csc11.005404.SU6_jimmy.susy.recon.AOD.v12000601
SU8.1 trig1_misal1_csc11.005406.SU81_jimmy.susy.recon.AOD.v12000601
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• hadronic cross section given by:
for a particular kinematic configuration with s, t, u, should just need to change the probability that incoming partons *had* that configuration i.e. just a PDF re-weight
Reminder: PDF reweighting
( )ˆ α∑∫1
2 2 2 21 2 1 1 2 2 1 2 s
flav 0
ó= dx dx PDF(x ,Q ,flav ) ? PDF(x ,Q ,flav ) ? ó p,p , (Q ),Q
Re-weight MC to 10 TeV using:
xi : x of parton i at 14TeV; x i’: x of parton i at 10TeV
proton PDFs
hard subprocess cross section
pTJet,1,2 >150,100
GeV
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selection cuts
two-jet three-jetCut1 pT
jet1 pTjet1
Cut2 pTjet2 pT
jet3
Cut3 MET>80GeV MET>80GeV
Cut4 MET/Meff>0.3 MET/Meff>0.25
Cut5 dphi(jet1-MET)>0.2 dphi(jet1-MET)>0.2
Cut6 dphi(jet2-MET)>0.2 dphi(jet2-MET)>0.2
Cut7 dphi(jet3-MET)>0.2
Cut8 no isolated leptons no isolated leptons
as in CSC5 (for now)
Cuts: [two-/three-jet+MET analyses @ 10TeV, 10pb-1]
“loose”, “medium” or “tight” (as given below)
tight medium loosetwo-jet pT > 200,80 GeV pT > 180,50 GeV pT > 120,40 GeV
three-jet
pT > 100,50,50 GeV
pT > 100,40,40 GeV pT > 80,40,40 GeV
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Results (extras):
Two-Jet+MET [Meff analysis]various SUX signal MC compared to total SM background
Jets+MET at 10TeV with 10pb-1 24 Sept'08 14
Results (extras):
Three-Jet+MET [Meff analysis]various SUX signal MC compared to total SM background
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Results (i): Meff 10TeV, 10pb-
1two-jet+MET [all cuts except trigger]
Jets+MET at 10TeV with 10pb-1 24 Sept'08 16
Results (ii): Meff 10TeV, 10pb-
1three-jet+MET [all cuts except trigger]
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Results (iii): MT2
two-jet+MET [jet-pT, lepton veto cuts only]
10TeV, 10pb-
1
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Results (iv): MT2 10TeV, 10pb-
1two-jet+MET [jet-pT, lepton-veto, MET cuts only]
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Results (v): MT2 10TeV, 10pb-
1two-jet+MET [jet-pT, lepton-veto, MET cuts and J70_XE70 trigger]
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Results (vi): MT2 10TeV, 10pb-
1three-jet+MET [jet-pT, and lepton-veto cuts only]
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Results (vii): MT2 10TeV, 10pb-
1three-jet+MET [jet-pT, lepton-veto, MET cuts only]
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Results (viii): MT2 10TeV, 10pb-
1three-jet+MET [jet-pT, lepton-veto, MET cuts and J70_XE70 trigger]