TCanvas *c1 = new TCanvas("c1");
TPaveText *pt = new TPaveText(.05,.1,.95,.8);

pt->AddText("#frac{2s}{#pi#alpha^{2}}  #frac{d#sigma}{dcos#theta} "
            "(e^{+}e^{-} #rightarrow f#bar{f} ) = #left| #frac{1}{1 - #Delta#alpha} "
            "#right|^{2} (1+cos^{2}#theta)");

pt->AddText("+ 4 Re #left{ #frac{2}{1 - #Delta#alpha} #chi(s) "
            "#[]{#hat{g}_{#nu}^{e}#hat{g}_{#nu}^{f} "
            "(1 + cos^{2}#theta) + 2 #hat{g}_{a}^{e}#hat{g}_{a}^{f} cos#theta) } #right}");

pt->AddText("+ 16#left|#chi(s)#right|^{2} "
            "#left[(#hat{g}_{a}^{e}^{2} + #hat{g}_{v}^{e}^{2})"
            "(#hat{g}_{a}^{f}^{2} + #hat{g}_{v}^{f}^{2})(1+cos^{2}#theta)"
            "+ 8 #hat{g}_{a}^{e} #hat{g}_{a}^{f} #hat{g}_{v}^{e}"
            "#hat{g}_{v}^{f}cos#theta#right] ");

pt->SetLabel("Born equation");
pt->Draw();

gROOT->GetListOfCanvases()->Draw()