## main466

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    // main466.cc is a part of the PYTHIA event generator.
    // Copyright (C) 2026 Torbjorn Sjostrand.
    // PYTHIA is licenced under the GNU GPL v2 or later, see COPYING for details.
    // Please respect the MCnet Guidelines, see GUIDELINES for details.

    // Authors:
    //            Marius Utheim

    // Keywords:
    //            Hadron widths

    // Code to create parameterization tables for hadron widths.
    // Useful if resonances are added or particle properties are changed.

    #include "Pythia8/Pythia.h"
    #include "Pythia8Plugins/InputParser.h"
    using namespace Pythia8;

    //==========================================================================

    int main(int argc, char* argv[]) {

      // Set up command line options.
      InputParser ip("Create parameterization tables for hadron widths.",
        {"./main465 -a 2212 -b 2212"});
      ip.add("p", "50", "Precision, provided as integer.", {"-precision"});
      ip.add("o", "main466.dat", "Output file for the widths.", {"-out"});

      // Initialize the parser and exit if necessary.
      InputParser::Status status = ip.init(argc, argv);
      if (status != InputParser::Valid) return status;

      // Initialize Pythia.
      Pythia pythia;
      pythia.readString("ProcessLevel:all = off");

      if (!pythia.init()) {
        cout << endl << " Pythia failed to initialize. \n"
         " If this happened because hadron widths are unavailable or invalid,\n"
         " particle data should still be loaded. In this case, this code should\n"
         " still be used to generate hadron widths. Therefore, execution will\n"
         " continue." << endl << endl;
      }

      // Perform parameterization.
      HadronWidths& hadronWidths = pythia.hadronWidths;
      hadronWidths.parameterizeAll(ip.get<int>("p"));
      hadronWidths.save(ip.get<string>("o"));

      // Done.
      return 0;

    }