constants.h

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/*
 *    Copyright (c) 2013-2019
 *      SMASH Team
 *
 *    GNU General Public License (GPLv3 or later)
 */
#ifndef SRC_INCLUDE_CONSTANTS_H_
#define SRC_INCLUDE_CONSTANTS_H_

#include <cmath>
#include <cstdint>
#include <limits>

namespace smash {

constexpr double hbarc = 0.197327053;

constexpr double fm2_mb = 0.1;

constexpr double gev2_mb = hbarc * hbarc / fm2_mb;

constexpr double mev_to_gev = 1.e-3;

constexpr double really_small = 1.0e-6;

constexpr double twopi = 2. * M_PI;

constexpr double nuclear_density = 0.168;

constexpr double small_number = 1.0e-4;

constexpr double nucleon_mass = 0.938;

constexpr double pion_mass = 0.138;

constexpr double kaon_mass = 0.494;

constexpr double omega_mass = 0.783;

constexpr double a1_mass = 1.26;
constexpr double delta_mass = 1.232;
constexpr double deuteron_mass = 1.8756;

constexpr double fine_structure = 7.2973525698e-3;

constexpr double maximum_cross_section = 200.;  // mb

constexpr int maximum_rndm_seed_in_pythia = 900000000;

constexpr double minimum_sqrts_pythia_can_handle = 10.0;  // GeV

constexpr std::uint32_t ID_PROCESS_PHOTON =
    std::numeric_limits<std::uint32_t>::max();

}  // namespace smash

#endif  // SRC_INCLUDE_CONSTANTS_H_