1 | // MiniStringFragmentation.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 | // This file contains the class for "cluster" fragmentation. |
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7 | // MiniStringFragmentation: handle the fragmentation of low-mass systems. |
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8 | |
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9 | #ifndef Pythia8_MiniStringFragmentation_H |
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10 | #define Pythia8_MiniStringFragmentation_H |
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11 | |
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12 | #include "Basics.h" |
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13 | #include "Event.h" |
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14 | #include "FragmentationFlavZpT.h" |
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15 | #include "FragmentationSystems.h" |
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16 | #include "Info.h" |
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17 | #include "ParticleData.h" |
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18 | #include "PythiaStdlib.h" |
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19 | #include "Settings.h" |
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20 | |
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21 | namespace Pythia8 { |
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22 | |
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23 | //========================================================================== |
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24 | |
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25 | // The MiniStringFragmentation class contains the routines to fragment |
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26 | // occasional low-mass colour singlet partonic systems, where the string |
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27 | // approach is not directly applicable (for technical reasons). |
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28 | |
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29 | class MiniStringFragmentation { |
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30 | |
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31 | public: |
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32 | |
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33 | // Constructor. |
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34 | MiniStringFragmentation() {} |
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35 | |
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36 | // Initialize and save pointers. |
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37 | void init(Info* infoPtrIn, Settings& settings, |
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38 | ParticleData* particleDataPtrIn, Rndm* rndmPtrIn, |
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39 | StringFlav* flavSelPtrIn, StringPT* pTSelPtrIn, StringZ* zSelPtrIn); |
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40 | |
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41 | // Do the fragmentation: driver routine. |
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42 | bool fragment( int iSub, ColConfig& colConfig, Event& event, |
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43 | bool isDiff = false); |
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44 | |
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45 | private: |
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46 | |
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47 | // Constants: could only be changed in the code itself. |
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48 | static const int NTRYDIFFRACTIVE, NTRYLASTRESORT, NTRYFLAV; |
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49 | |
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50 | // Pointer to various information on the generation. |
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51 | Info* infoPtr; |
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52 | |
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53 | // Pointer to the particle data table. |
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54 | ParticleData* particleDataPtr; |
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55 | |
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56 | // Pointer to the random number generator. |
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57 | Rndm* rndmPtr; |
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58 | |
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59 | // Pointers to classes for flavour, pT and z generation. |
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60 | StringFlav* flavSelPtr; |
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61 | StringPT* pTSelPtr; |
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62 | StringZ* zSelPtr; |
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63 | |
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64 | // Initialization data, read from Settings. |
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65 | int nTryMass; |
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66 | double bLund; |
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67 | |
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68 | // Data members. |
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69 | bool isClosed; |
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70 | double mSum, m2Sum; |
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71 | Vec4 pSum; |
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72 | vector<int> iParton; |
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73 | FlavContainer flav1, flav2; |
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74 | |
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75 | // Attempt to produce two particles from a cluster. |
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76 | bool ministring2two( int nTry, Event& event); |
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77 | |
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78 | // Attempt to produce one particle from a cluster. |
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79 | bool ministring2one( int iSub, ColConfig& colConfig, Event& event); |
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80 | |
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81 | }; |
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82 | |
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83 | //========================================================================== |
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84 | |
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85 | } // end namespace Pythia8 |
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86 | |
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87 | #endif // Pythia8_MiniStringFragmentation_H |
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