Fitting for H ZZ 2l2q Channel

Overview

The Helicity Liklihood needs to parameratize signal and background for a good fit. I am trying to do so here.

The RooMyPdf.cxx file has a custom Pdf that I can change as I wish. The fitTest.cpp file does the fit. It is also created so that you can break the fit into windows and do it like so.

Configuration

Make certain when you install root you configure roofit.

svn co http://root.cern.ch/svn/root/tags/v5-32-02 root-5.32.02
cd root-5.32.02
./configure --enable-roofit
make -j4

.L RooMyPdf.cxx+
.L fitTest.cpp+
fitTest()

Fit Info

cosTheta1

return a1*cos(TMath::Pi()*x/2) + a2*cos(2*TMath::Pi()*x/2) + a3*cos(3*TMath::Pi()*x/2) + a4*cos(4*TMath::Pi()*x/2);

RooRealVar a1("a1","a1",400,-1000,1000);
RooRealVar a2("a2","a2",40,-1000,1000);
RooRealVar a3("a3","a3",-160,-1000,1000);
RooRealVar a4("a4","a4",70,-100,100);

RooRealVar::a1 = 394.257 +/- 21.0375 L(-1000 - 1000)
RooRealVar::a2 = 37.5747 +/- 4.53034 L(-1000 - 1000)
RooRealVar::a3 = -162.391 +/- 5.9717 L(-1000 - 1000)
RooRealVar::a4 = 69.4551 +/- 4.67173 L(-100 - 100)

cosTheta2

For fiting 200 <-> 1000:
RooRealVar a1("a1","a1",300,-1000,1000);
RooRealVar a2("a2","a2",-40,-1000,1000);
RooRealVar a3("a3","a3",-20,-1000,1000);
RooRealVar a4("a4","a4",1.0,-100,100);

RooRealVar::a1 = 347.687 +/- 18.9402 L(-1000 - 1000)
RooRealVar::a2 = -11.6412 +/- 2.51156 L(-1000 - 1000)
RooRealVar::a3 = -46.6431 +/- 3.30454 L(-1000 - 1000)
RooRealVar::a4 = 15.9679 +/- 2.61697 L(-100 - 100)

return a1*cos(TMath::Pi()*x/2) + a2*cos(2*TMath::Pi()*x/2) + a3*cos(3*TMath::Pi()*x/2) + a4*cos(4*TMath::Pi()*x/2);

-- MatthewKress - 24-Apr-2012

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Topic revision: r2 - 2012-04-25 - MatthewKress
 
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