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Constraints from "Higgs mass and CrossSection Measurements at a 500GeV CLIC Machine, Operating at sqrt(s)= 350GeV and 500GeV"  
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Pseudorapidity (eta) = ln(tan(θCM)/2)  
Added:  
> >  ReportFinal report (40 credits) on Moodle  
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Constraints from "Higgs mass and CrossSection Measurements at a 500GeV CLIC Machine, Operating at sqrt(s)= 350GeV and 500GeV"  
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Monte Carlo fit: if invariant mass was within 5 GeV of Z mass the event was declared to be Higgsstrahlung. The remaining were flagged as WW fusion.  
Added:  
> >  Project Work
Lepon IdentificationThe ZFinder selects suitable Z boson candidates.
Reconstruction of H mass from inferred vectorGiven the initial state four vector and the four vector of the Z boson it is possible to infer the four vector of the recoil mass. The only two variables of the Higgs recoil mass are the momenta of the pair of leptons from the Z decay. Note that (besides the background) precision of the Higgs recoil mass measurement can be aﬀected by both the smearing and radiative effects.
The cross section can also precisely be measured to examine the coupling between the Higgs and the Z boson, given by: g^2(HZZ) : sigma = Ns/ eL where Ns is the number of events of Higgsstrahlung signal, e is the total eﬃciency of signal reconstruction, and L is the luminosity.
EtaPhi plotsThe momentum of each particle produced in a collision can be decomposed in:
Pseudorapidity (eta) = ln(tan(θCM)/2)  
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Constraints from "Higgs mass and CrossSection Measurements at a 500GeV CLIC Machine, Operating at sqrt(s)= 350GeV and 500GeV"  
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> >  According the Readme, Bremstrahlung and FSR recovery is on.  
NB: ZFinder tautau decay mode and qq decay mode not implemented. 
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Constraints from "Higgs mass and CrossSection Measurements at a 500GeV CLIC Machine, Operating at sqrt(s)= 350GeV and 500GeV"  
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Following the selection of the lepton pair: the Transverse momentum and polar angle of the lepton pair were calculated. Also Acollinearity and Acopolanarity of the leptons were calculated.  
Added:  
> >  Cuts from ZFinderThe ZFinder works by using the fact that the electric calorimeter does not detect any muons. Vector _pfovec is the detected particle vector. If the energy of _pfovec is less than the momentum cut for fermion from Z decay then it is not a muon. If the electric calorimetry is greater than the cut on the muon ECAL energy then not a muon. If the hadronic calorimetry is greater than the cut on the muon HCAL energy then not a muon. If the energy of _pfovec is less than the momentum cut for fermion from Z decay then it is not an electron. If the electric calorimeter is less than the cut on the electron ECAL energy, then not an electron. If the hadronic calorimeter is greater than the cut on the electron HCAL energy, then not an electron.
NB: ZFinder tautau decay mode and qq decay mode not implemented.  
Background RejectionIn mumuX channel, the mass of the selected lepton pair, Transverse momentum of lepton pair, and the recoil mass were investigated. The made distributions made from the properties motivated the cuts: 
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Changed:  
< <   DominicSmith  20121120  
> >  Constraints from "Higgs mass and CrossSection Measurements at a 500GeV CLIC Machine, Operating at sqrt(s)= 350GeV and 500GeV"  
Changed:  
< <  Constraints from "Higgs mass and CrossSection Measurements at a 500GeV CLIC Machine, Operating at sqrt(s)= 350GeV and 500GeV"  
> >  
Changed:  
< <  The 350 GeV HZ Recoil Analysis:  
> >  The 350 GeV HZ Recoil Analysis:  
For both muon and electron channels, the background has a total cross section of roughly 1000 times greater than the signal. Given the small signal crosssections, excess events in the Higgs note were generated, simulated and reconstructed. A safety factor of 50 was applied, and events were then weighted to the correct normalisation throughout the analysis. This helped remove the effects of statistical fluctuations in the signal sample.
For the background sample, cuts at generator level are required:  
Changed:  
< < 
 
> > 
 
Following the selection of the lepton pair: the Transverse momentum and polar angle of the lepton pair were calculated. Also Acollinearity and Acopolanarity of the leptons were calculated.  
Changed:  
< <  Background Rejection  
> >  Background Rejection  
In mumuX channel, the mass of the selected lepton pair, Transverse momentum of lepton pair, and the recoil mass were investigated. The made distributions made from the properties motivated the cuts:
Selection Cuts:  
Changed:  
< <  
> > 
 
Changed:  
< <  500 GeV HZ Recoil Analysis  
> >  500 GeV HZ Recoil Analysis  
Hard selection cuts:  
Changed:  
< <  
> > 
 
Changed:  
< <  500 GeV HZqq Analysis  
> >  500 GeV HZqq Analysis  
Jet reconstruction: 3 different values for jet cone size:
R=0.7, 1.0 and 1.3 Kinematic Fit:  
Changed:  
< < 
 
> > 
 
The variation of the jet parameters, and calculation of the fit probability used the following jet energy and angular resolutions:
 
Changed:  
< <  
> > 
 
Changed:  
< <  Fit Procedure  
> >  Fit Procedure  
To get the mass of the Higgs, Mh, Simplified Kernal Estimation used the shape of the fitted Higgs mass distribution for the signal sample.  
Changed:  
< <  Mass range 90 GeV < Mh < 200 GeV  
> >  Mass range 90 GeV < Mh < 200 GeV
500 GeV Hmumu AnalysisMonte Carlo fit: if invariant mass was within 5 GeV of Z mass the event was declared to be Higgsstrahlung. The remaining were flagged as WW fusion.  
Deleted:  
< <  500 GeV Hmumu Analysis  
Deleted:  
< <  Monte Carlo fit: if invariant mass was within 5 GeV of Z mass the event was declared to be Higgsstrahlung. The remaining were flagged as WW fusion.  
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> >   DominicSmith  20121120

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Changed:  
< <  Contraints from "Higgs mass and CrossSection Measurements at a 500GeV CLIC Machine, Operating at sqrt(s)= 350GeV and 500GeV"  
> >  Constraints from "Higgs mass and CrossSection Measurements at a 500GeV CLIC Machine, Operating at sqrt(s)= 350GeV and 500GeV"  
The 350 GeV HZ Recoil Analysis: 
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Added:  
> > 
Contraints from "Higgs mass and CrossSection Measurements at a 500GeV CLIC Machine, Operating at sqrt(s)= 350GeV and 500GeV" The 350 GeV HZ Recoil Analysis: For both muon and electron channels, the background has a total cross section of roughly 1000 times greater than the signal. Given the small signal crosssections, excess events in the Higgs note were generated, simulated and reconstructed. A safety factor of 50 was applied, and events were then weighted to the correct normalisation throughout the analysis. This helped remove the effects of statistical fluctuations in the signal sample. For the background sample, cuts at generator level are required:
Following the selection of the lepton pair: the Transverse momentum and polar angle of the lepton pair were calculated. Also Acollinearity and Acopolanarity of the leptons were calculated. Background Rejection In mumuX channel, the mass of the selected lepton pair, Transverse momentum of lepton pair, and the recoil mass were investigated. The made distributions made from the properties motivated the cuts: Selection Cuts: 500 GeV HZ Recoil Analysis Hard selection cuts: 500 GeV HZqq Analysis Jet reconstruction: 3 different values for jet cone size: R=0.7, 1.0 and 1.3 Kinematic Fit:
The variation of the jet parameters, and calculation of the fit probability used the following jet energy and angular resolutions: Fit Procedure To get the mass of the Higgs, Mh, Simplified Kernal Estimation used the shape of the fitted Higgs mass distribution for the signal sample. Mass range 90 GeV < Mh < 200 GeV 500 GeV Hmumu Analysis Monte Carlo fit: if invariant mass was within 5 GeV of Z mass the event was declared to be Higgsstrahlung. The remaining were flagged as WW fusion. 