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NeutralPionDecay.C
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NeutralPionDecay.C
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//John Campbell
//a simple graphic which displays the Feynman diagram for Charged Pion decay
void NeutralPionDecay()
{
TCanvas *c1 = new TCanvas("c1", "A canvas", 10,10, 600, 300);
c1->Range(0, 0, 140, 60);
Int_t linsav = gStyle->GetLineWidth();
gStyle->SetLineWidth(3);
TLatex t;
t.SetTextAlign(22);
t.SetTextSize(0.1);
TCurlyLine *g1 = new TCurlyLine(10, 50, 30, 30);
g1->SetWavy();
g1->SetLineColor(5);
g1->Draw();
TCurlyLine *g2 = new TCurlyLine(110, 30, 130, 50);
g2->SetWavy();
g2->SetLineColor(5);
g2->Draw();
t.DrawLatex(7,6,"u");
t.DrawLatex(7,55,"#gamma");
l = new TArrow(30, 30, 110, 30,0.05,">"); l->Draw();
l->SetLineColor(6);
TPaveText *pt = new TPaveText(50,20,.95,.8);
pt->AddText("#sqrt{#frac{1}{2}} \ (u#bar{u} - d#bar{d})");
pt->Draw();
t.DrawLatex(70, 37.5,"#pi^{0}");
l = new TArrow(110, 30, 130, 10,0.05,">"); l->Draw();
l->SetLineColor(6);
l = new TArrow(10, 10, 30, 30,0.05,">"); l->Draw();
l->SetLineColor(6);
t.DrawLatex(135,6,"#bar{u}");
t.DrawLatex(135,55,"#gamma");
c1->Update();
gStyle->SetLineWidth(linsav);
}