gen/lA/oleksii_bh_impl.hh

0001 // lAger: General Purpose l/A-event Generator
0002 // Copyright (C) 2016-2021 Sylvester Joosten <sjoosten@anl.gov>
0003 //
0004 // This file is part of lAger.
0005 //
0006 // lAger is free software: you can redistribute it and/or modify
0007 // it under the terms of the GNU General Public License as published by
0008 // the Free Shoftware Foundation, either version 3 of the License, or
0009 // (at your option) any later version.
0010 //
0011 // lAger is distributed in the hope that it will be useful,
0012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
0013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
0014 // GNU General Public License for more details.
0015 //
0016 // You should have received a copy of the GNU General Public License
0017 // along with lAger.  If not, see <https://www.gnu.org/licenses/>.
0018 //
0019
0020 #ifndef OLEKSII_BH_IMPL_LOADED
0021 #define OLEKSII_BH_IMPL_LOADED
0022
0023 namespace oleksii_bh_impl {
0024
0025 // calculate the cross section
0026 // t: mandelstam t
0027 // q2: invariant mass of dilepton pair squared
0028 // Egamma: photon energy
0029 // thetaCM: electron theta in dilepton CM frame
0030 // phiCM: electron phi in dilepton CM frame
0031 double calc_xsec(const double t, const double q2, const double Egamma,
0032                  const double thetaCM, const double phiCM);
0033 } // namespace oleksii_bh_impl
0034
0035 #endif