1 | // BeamRemnants.h is a part of the PYTHIA event generator. |
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2 | // Copyright (C) 2012 Torbjorn Sjostrand. |
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3 | // PYTHIA is licenced under the GNU GPL version 2, see COPYING for details. |
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4 | // Please respect the MCnet Guidelines, see GUIDELINES for details. |
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5 | |
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6 | // Header file for beam-remnants handling. |
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7 | // BeamRemnants: matches the remnants between the two beams. |
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8 | |
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9 | #ifndef Pythia8_BeamRemnants_H |
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10 | #define Pythia8_BeamRemnants_H |
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11 | |
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12 | #include "Basics.h" |
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13 | #include "BeamParticle.h" |
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14 | #include "Event.h" |
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15 | #include "FragmentationFlavZpT.h" |
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16 | #include "Info.h" |
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17 | #include "ParticleData.h" |
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18 | #include "PartonDistributions.h" |
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19 | #include "PartonSystems.h" |
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20 | #include "PythiaStdlib.h" |
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21 | #include "Settings.h" |
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22 | |
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23 | namespace Pythia8 { |
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24 | |
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25 | //========================================================================== |
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26 | |
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27 | // This class matches the kinematics of the hard-scattering subsystems |
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28 | // (with primordial kT added) to that of the two beam remnants. |
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29 | |
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30 | class BeamRemnants { |
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31 | |
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32 | public: |
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33 | |
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34 | // Constructor. |
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35 | BeamRemnants() : iDS(0) { } |
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36 | |
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37 | // Initialization. |
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38 | bool init( Info* infoPtrIn, Settings& settings, Rndm* rndmPtrIn, |
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39 | BeamParticle* beamAPtrIn, BeamParticle* beamBPtrIn, |
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40 | PartonSystems* partonSystemsPtrIn); |
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41 | |
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42 | // New beams possible for handling of hard diffraction. |
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43 | void reassignBeamPtrs( BeamParticle* beamAPtrIn, BeamParticle* beamBPtrIn, |
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44 | int iDSin) {beamAPtr = beamAPtrIn; beamBPtr = beamBPtrIn; iDS = iDSin;} |
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45 | |
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46 | // Select the flavours/kinematics/colours of the two beam remnants. |
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47 | bool add( Event& event); |
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48 | |
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49 | private: |
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50 | |
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51 | // Constants: could only be changed in the code itself. |
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52 | static const bool ALLOWCOLOURTWICE, CORRECTMISMATCH; |
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53 | static const int NTRYCOLMATCH, NTRYKINMATCH; |
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54 | |
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55 | // Initialization data, read from Settings. |
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56 | bool doPrimordialKT, allowRescatter, doRescatterRestoreY, doReconnect; |
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57 | double primordialKTsoft, primordialKThard, primordialKTremnant, |
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58 | halfScaleForKT, halfMassForKT, reconnectRange, |
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59 | pT0Ref, ecmRef, ecmPow; |
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60 | |
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61 | // Information set for events. |
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62 | int nSys, oldSize, iDS; |
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63 | double eCM, sCM, pT0, pT20Rec; |
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64 | |
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65 | // Colour collapses (when one colour is mapped onto another). |
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66 | vector<int> colFrom, colTo; |
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67 | |
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68 | // Pointer to various information on the generation. |
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69 | Info* infoPtr; |
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70 | |
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71 | // Pointer to the random number generator. |
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72 | Rndm* rndmPtr; |
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73 | |
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74 | // Pointers to the two incoming beams. |
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75 | BeamParticle* beamAPtr; |
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76 | BeamParticle* beamBPtr; |
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77 | |
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78 | // Pointer to information on subcollision parton locations. |
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79 | PartonSystems* partonSystemsPtr; |
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80 | |
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81 | // Do the kinematics of the collision subsystems and two beam remnants. |
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82 | bool setKinematics( Event& event); |
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83 | |
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84 | // Allow colour reconnections. |
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85 | bool reconnectColours( Event& event); |
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86 | |
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87 | // Check that colours are consistent. |
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88 | bool checkColours( Event& event); |
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89 | |
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90 | }; |
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91 | |
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92 | //========================================================================== |
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93 | |
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94 | } // end namespace Pythia8 |
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95 | |
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96 | #endif // Pythia8_BeamRemnants_H |
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