{
    using namespace RooFit;
    
    RooRealVar t("t","t",0.,10.);
    RooRealVar tau("tau","Decay lifetime",1.6);
    RooGaussModel res("res","Resolution model",t,RooConst(0.),RooConst(0.2));
    RooDecay model("model","model",t,tau,res,RooDecay::SingleSided);
    
    RooPlot *frame = t.frame();
    model.plotOn(frame);
    
    frame->Draw();
}