git://git.uio.no / u / mrichter / AliRoot.git / blame
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1 | /////////////////////////////////////////////////////////////////////////// |
| 2 | // | |
| 3 | // Copyright 2010 | |
| 4 | // | |
| 5 | // This file is part of starlight. | |
| 6 | // | |
| 7 | // starlight is free software: you can redistribute it and/or modify | |
| 8 | // it under the terms of the GNU General Public License as published by | |
| 9 | // the Free Software Foundation, either version 3 of the License, or | |
| 10 | // (at your option) any later version. | |
| 11 | // | |
| 12 | // starlight is distributed in the hope that it will be useful, | |
| 13 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 15 | // GNU General Public License for more details. | |
| 16 | // | |
| 17 | // You should have received a copy of the GNU General Public License | |
| 18 | // along with starlight. If not, see <http://www.gnu.org/licenses/>. | |
| 19 | // | |
| 20 | /////////////////////////////////////////////////////////////////////////// | |
| 21 | // | |
| 22 | // File and Version Information: | |
| 23 | // $Rev:: 164 $: revision of last commit | |
| 24 | // $Author:: odjuvsla $: author of last commit | |
| 25 | // $Date:: 2013-10-06 16:18:08 +0200 #$: date of last commit | |
| 26 | // | |
| 27 | // Description: | |
| 28 | // | |
| 29 | // | |
| 30 | // | |
| 31 | /////////////////////////////////////////////////////////////////////////// | |
| 32 | ||
| 33 | ||
| 34 | #ifndef PHOTONNUCLEUSCROSSSECTION_H | |
| 35 | #define PHOTONNUCLEUSCROSSSECTION_H | |
| 36 | ||
| 37 | ||
| 38 | #include "starlightconstants.h" | |
| 39 | #include "beambeamsystem.h" | |
| 40 | ||
| 41 | ||
| 42 | class photonNucleusCrossSection { | |
| 43 | ||
| 44 | public: | |
| 45 | ||
| 46 | photonNucleusCrossSection(const beamBeamSystem& bbsystem); | |
| 47 | ~photonNucleusCrossSection(); | |
| 48 | ||
| 49 | double slopeParameter () const { return _slopeParameter; } ///< returns slope of t-distribution [(GeV/c)^{-2}] | |
| 50 | double getChannelMass () const { return _channelMass; } ///< returns mass of the produced system [GeV/c^2] | |
| 51 | double getBNORM () const { return _BNORM; } | |
| 52 | double luminosity () const { return _luminosity; } ///< returns luminosity [10^{26} cm^{-2} sec^{-1}] | |
| 53 | beamBeamSystem getbbs () const { return _bbs; } ///< returns beamBeamSystem | |
| 54 | double vmPhotonCoupling() const { return _vmPhotonCoupling; } ///< vectormeson-photon coupling constant f_v / 4 pi (cf. Eq. 10 in KN PRC 60 (1999) 014903) | |
| 55 | double getDefaultC () const { return _defaultC; } | |
| 56 | double maxPhotonEnergy () const { return _maxPhotonEnergy; } ///< returns max photon energy in lab frame [GeV] (for vectormesons only) | |
| 57 | ||
| 58 | void crossSectionCalculation(const double bwnormsave); | |
| 59 | // Will think about it...For VMs we just calculate it | |
| 60 | // So just use the wide or narrow constructor to calculate it | |
| 61 | // wide/narrow will inherit this. | |
| 62 | double getcsgA(const double Egamma, | |
| 63 | const double W); | |
| 64 | double photonFlux(const double Egamma); | |
| 65 | double sigmagp(const double Wgp); | |
| 66 | double sigma_A(const double sig_N); | |
| 67 | double sigma_N(const double Wgp); | |
| 68 | double breitWigner(const double W, | |
| 69 | const double C); | |
| 70 | double nepoint(const double Egamma, | |
| 71 | const double bmin); | |
| 72 | ||
| 73 | protected: | |
| 74 | const unsigned int _nWbins; | |
| 75 | const unsigned int _nYbins; | |
| 76 | ||
| 77 | const double _wMin; | |
| 78 | const double _wMax; | |
| 79 | const double _yMax; | |
| 80 | ||
| 81 | const double _beamLorentzGamma; | |
| 82 | ||
| 83 | private: | |
| 84 | ||
| 85 | beamBeamSystem _bbs; | |
| 86 | ||
| 87 | // copied from inputParameters | |
| 88 | double _protonEnergy; | |
| 89 | starlightConstants::particleTypeEnum _particleType; | |
| 90 | int _beamBreakupMode; ///< breakup mode for beam particles | |
| 91 | bool _coherentProduction; ///< if true, production is coherent, else incoherent | |
| 92 | double _incoherentFactor; ///< allows to scale the incoherent contribution in vector meson production | |
| 93 | int _productionMode; | |
| 94 | int _sigmaNucleus; | |
| 95 | ||
| 96 | // locally defined parameters | |
| 97 | double _slopeParameter; ///< slope of t-distribution [(GeV/c)^{-2}] | |
| 98 | double _vmPhotonCoupling; ///< vectormeson-photon coupling constant f_v / 4 pi (cf. Eq. 10 in KN PRC 60 (1999) 014903) | |
| 99 | double _ANORM; | |
| 100 | double _BNORM; | |
| 101 | double _defaultC; | |
| 102 | double _luminosity; ///< luminosity [10^{26} cm^{-2} sec^{-1}] | |
| 103 | double _maxPhotonEnergy; ///< max photon energy in lab frame [GeV] (for vectormesons only) | |
| 104 | double _width; ///< width of the produced system [GeV/c^2] | |
| 105 | double _channelMass; ///< mass of the produced system [GeV/c^2] | |
| 106 | ||
| 107 | }; | |
| 108 | ||
| 109 | ||
| 110 | #endif // PHOTONNUCLEUSCROSSSECTION_H |