rho_mass_shape.C

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//TITLE Choosing the rho0 -> e+e- partial width model
 
{
 
    TCanvas *c1 = new TCanvas();
    c1->SetLogy(1);
 
    //Remove VDM M**3 scaling
    //Not part of standard pluto -> Add this by hand
    PFixedDecay *pmodel = new PFixedDecay("rho0_novdm_e-_e+",
                      "Rho decay without VDM", -1);
    pmodel->Add("rho0, parent");
    pmodel->Add("e+, daughter");
    pmodel->Add("e-, daughter");
    makeDistributionManager()->Add(pmodel);
 
    //Print out what we have:
    makeDistributionManager()->Print("decay_models");
 
    //Choosing the model using the distribution manager
    makeDistributionManager()->Enable("rho_picutoff_e-_e+");
 
    //Write the primary models to the data base:
    makeDistributionManager()->LinkDB();
 
    //Read the primary model for the rho meson:
    PChannelModel *rho = makeDynamicData()->GetParticleModel(makeStaticData()->GetParticleID("rho0"));
 
    //Print rho0 properties:
    makeStaticData()->PrintParticle("rho0");
 
    //Set the decay index of the primary model:
    rho->SetParameter(1, 85);
    rho->SetDidx(85);
    
    //Save rho model as ROOT will not evaluate the GetRandom again
    PChannelModel *rho2 = (PChannelModel *)rho->Clone();
    PChannelModel *rho3 = (PChannelModel *)rho->Clone();
 
    TH1F *h1 = new TH1F("rho0", "rho0", 100, 0., 1.2);
    rho->GetRandom();
    for (int i=0; i<10000; i++) 
    h1->Fill(rho->GetRandom());
    h1->Draw();
    
    //Change it!
    makeDistributionManager()->Enable("rho0_ee_e-_e+");
    makeDistributionManager()->LinkDB();
 
    TH1F *h2 = new TH1F("rho0_2", "rho0_2", 100, 0., 1.2);
    for (int i=0; i<15000; i++) 
    h2->Fill(rho2->GetRandom());
    h2->SetLineStyle(7);
    h2->Draw("same");
 
    makeDistributionManager()->Enable("rho0_novdm_e-_e+");
    makeDistributionManager()->LinkDB();
 
    TH1F *h3 = new TH1F("rho0_3", "rho0_3", 100, 0., 1.2);
    for (int i=0; i<10000; i++) 
    h3->Fill(rho3->GetRandom());
    h3->SetLineStyle(2);
    h3->Draw("same");
 
    //scale all histograms that they match in the limit of higher masses
    h2->Scale(h1->GetBinContent(90) / h2->GetBinContent(90));
    h3->Scale(h1->GetBinContent(90) / h3->GetBinContent(90));
}