h->zz->4l update
DESCRIPTION
H->ZZ->4l update. 10/02/08. Current Status. This was the first run through analysis chain from the cms note http://cms.cern.ch/iCMS/jsp/openfile.jsp?tp=draft&files=AN2008_050_v3.pdf Samples used: Hzz150 pythia Z’s forced to e, mu, tau’s Inlcuded 4e, 4mu enhancement - PowerPoint PPT PresentationTRANSCRIPT
H->ZZ->4l update
10/02/08
Current Status
• This was the first run through analysis chain from the cms note– http://cms.cern.ch/iCMS/jsp/openfile.jsp?tp=draft&files=AN2008_050_v3.pdf
• Samples used:– Hzz150 pythia
• Z’s forced to e, mu, tau’s• Inlcuded 4e, 4mu enhancement• X section * BR = 0.01120 pb
– ZZ (qq->ZZ->4l, s + t channel), comphep• Z’s forced to e, mu, tau• Used a m4l dependent K factor• Xsection * BR = 0.131 pb
– Ttbar TopRex• Tt->WWbb; W -> e, mu, tau; b-> freely• Xsection * BR = 2.51 pb
– Zbb• Comphep• Z-> e, mu, tau; b->freely• Filter: 4 (e/mu w/pt > 2 and |eta| < 2.7)
Signal Fid Efficiency
• My version of Figure 3:– Den = h->ZZ->(4e, 4, or 2e2 inclusive)– Num = h->ZZ->(4e, 4, or 2e2 exclusive with || < 2.5)
Efficiency for Presel Cuts
• Combine figure 13 and 14– Various cuts for the preselection
• HLT (set to one for now)• Skim ( 2 l’s with pT > 10 and 1 w/pT > 5)• Two l+l- pairs• Two pairs ml+l- > 12 for both
• m4l > 100• Isolation requirement (e’s only)
#’s for Presel Cuts (4 mu channel)
h150 zz tt zbb
HLT 1 1 1 1skim 3 leps 0.987 0.978 0.983 0.8624 mu sel 0.83 0.978 0.983 0.8612 M2mu > 12 0.83 0.978 0.869 0.84m4l > 100 0.828 0.849 0.777 0.683loose iso 0.818 0.849 0.777 0.683
= # passing fid cut and passes cut (1-6) / # passing fid cut• Fid Cut:
• 4 leps (2e2mu, 4e, 4mu w/status=1) for signal
• same with |eta| < 2.5 for zz
• same with |eta| < 2.5 and pt > 2 for ttbar, zbb
Presel Kinematics -- lepton pT
Presel Kinematics -- lepton pT
Presel kinematics -- m2lBlue = ml+l- closest to mZ, red = the other ml+l-
Presel kinematics -- m2l
Presel kinematics -- m4l
Presel kinematics -- m4l
Presel m4l Stacked: normalized to xsection
Event Selection• We implemented the same cuts for selection (with
our variables)
• The numbers of events expected for 1 fb-1
sel 4e 4m 2e2mh150 0.5 1.14 1.28
zz 1.76 3.38 4.75tt 0 0.31 0.11
zbb 0.42 0.22 0.17
presel 4e 4m 2e2mh150 1.01 1.52 2.2
zz 4.9 8.1 8.4tt 19.7 65.7 54
zbb 12.4 31 20
Efficiency for Selection Cuts
Column1 h150 zz tt zbbIsolation 0.857 0.691 0.009 0.00152IP 0.857 691 0.009 0.0152pt 0.839 0.651 0.0063 0.011mZ1 0.839 0.651 0.0063 0.011mZ2 0.767 0.418 0.0046 0.0073
Selection Kinematics -- lepton pT
Selection Kinematics -- lepton pT
Selection kinematics -- m2l
Blue = ml+l- closest to mZ, red = the other ml+l-
Selection kinematics -- m2l
Selection kinematics -- m4l (norm to xsection)
Selection kinematics -- m4l (norm to xsection)
Selection kinematics -- m4l (norm to xsection)
M4l Stacked: normalized to xsection