Benchmarks for mrich: number of hits

A first set of detector benchmarks for the MRICH, just looking at nhits for backwards e/pi/proton events.

benchmarks/pid/scripts/mrich_analysis.cxx

+////////////////////////////////////////
+// Read reconstruction ROOT output file
+// Plot variables
+////////////////////////////////////////
+
+#include "ROOT/RDataFrame.hxx"
+#include <iostream>
+#include <fmt/core.h>
+
+#include "dd4pod/Geant4ParticleCollection.h"
+#include "dd4pod/PhotoMultiplierHitCollection.h"
+
+#include "TCanvas.h"
+#include "TStyle.h"
+#include "TMath.h"
+#include "TH1.h"
+#include "TF1.h"
+#include "TH1D.h"
+
+using ROOT::RDataFrame;
+using namespace ROOT::VecOps;
+
+void mrich_analysis(const char* input_fname = "sim_output/sim_pid_backward_e-_5GeV.root", const char* input_pname = "e-")
+{
+  // Setting for graphs
+  gROOT->SetStyle("Plain");
+  gStyle->SetOptFit(1);
+  gStyle->SetLineWidth(2);
+  gStyle->SetPadTickX(1);
+  gStyle->SetPadTickY(1);
+  gStyle->SetPadGridX(1);
+  gStyle->SetPadGridY(1);
+  gStyle->SetPadLeftMargin(0.14);
+  gStyle->SetPadRightMargin(0.14);
+
+  ROOT::EnableImplicitMT();
+  ROOT::RDataFrame d0("events", input_fname);
+
+  // Number of hits
+  auto nhits = [] (const std::vector<dd4pod::PhotoMultiplierHitData>& evt) {return (int) evt.size(); };
+
+  // Define variables
+  auto d1 = d0.Define("nhits", nhits, {"MRICHHits"});
+
+  // Define Histograms
+  auto hNhits =
+      d1.Histo1D({"hNhits", "Number of hits per events; Number of hits; Events",
+                  100, 0.0, 2000.0},
+                 "nhits");
+  auto hXYhits =
+      d1.Histo2D({"hXYhits", "Hit positions for events; Horizontal position [mm]; Vertical position [mm]",
+                  1000, -1000.0, +1000.0, 1000, -1000.0, +1000.0},
+                 "MRICHHits.position.x", "MRICHHits.position.y");
+
+  // Event Counts
+  auto nevents_thrown = d1.Count();
+  std::cout << "Number of Thrown Events: " << (*nevents_thrown) << "\n";
+
+  // Draw Histograms
+  {
+    TCanvas* c1 = new TCanvas("c1", "c1", 700, 500);
+    auto h = hXYhits->DrawCopy();
+    c1->SaveAs(fmt::format("results/pid/backward/mrich/mrich_{}_hits_xy.png",input_pname).c_str());
+    c1->SaveAs(fmt::format("results/pid/backward/mrich/mrich_{}_hits_xy.pdf",input_pname).c_str());
+  }
+  {
+    TCanvas* c2 = new TCanvas("c2", "c2", 700, 500);
+    c2->SetLogy(1);
+    auto h = hNhits->DrawCopy();
+    //h->GetYaxis()->SetTitleOffset(1.4);
+    h->SetLineWidth(2);
+    h->SetLineColor(kBlue);
+    c2->SaveAs(fmt::format("results/pid/backward/mrich/mrich_{}_nhits.png",input_pname).c_str());
+    c2->SaveAs(fmt::format("results/pid/backward/mrich/mrich_{}_nhits.pdf",input_pname).c_str());
+  }
+}