1 // PartonSystems.h is a part of the PYTHIA event generator.
2 // Copyright (C) 2010 Torbjorn Sjostrand.
3 // PYTHIA is licenced under the GNU GPL version 2, see COPYING for details.
4 // Please respect the MCnet Guidelines, see GUIDELINES for details.
6 // This file contains auxiliary classes for the parton-level processes.
7 // PartonSystem contains info on a single partonic subcollision.
8 // PartonSystems describes the set of subcollisions in the whole event.
10 #ifndef Pythia8_PartonSystems_H
11 #define Pythia8_PartonSystems_H
13 #include "PythiaStdlib.h"
17 //==========================================================================
19 // The PartonSystem class contains info on an individual singlet.
20 // Only to be used inside PartonSystems, so no private members.
27 PartonSystem() : iInA(0), iInB(0), sHat(0.) {iOut.reserve(10);}
36 //==========================================================================
38 // The PartonSystems class describes the whole set of subcollisions.
45 PartonSystems() {systems.resize(0);}
47 // Reset system list to empty.
48 void clear() {systems.resize(0);}
50 // Add new subsystem to list; return its index. Number of subsystems.
51 int addSys() {systems.push_back(PartonSystem());
52 return systems.size() - 1;}
53 int sizeSys() const {return systems.size();}
55 // Set, add or replace info to one system.
56 void setInA(int iSys, int iPos) {systems[iSys].iInA = iPos;}
57 void setInB(int iSys, int iPos) {systems[iSys].iInB = iPos;}
58 void addOut(int iSys, int iPos) {systems[iSys].iOut.push_back(iPos);}
59 void setOut(int iSys, int iMem, int iPos) {systems[iSys].iOut[iMem] = iPos;}
60 void replace(int iSys, int iPosOld, int iPosNew);
61 void setSHat(int iSys, double sHatIn) {systems[iSys].sHat = sHatIn;}
63 // Get info on one system.
64 bool hasInAB(int iSys) const {return ( (systems[iSys].iInA > 0)
65 || (systems[iSys].iInB > 0) ) ;}
66 int getInA(int iSys) const {return systems[iSys].iInA;}
67 int getInB(int iSys) const {return systems[iSys].iInB;}
68 int sizeOut(int iSys) const {return systems[iSys].iOut.size();}
69 int getOut(int iSys, int iMem) const {return systems[iSys].iOut[iMem];}
70 int sizeAll(int iSys) const {return (hasInAB(iSys))
71 ? systems[iSys].iOut.size() + 2 : systems[iSys].iOut.size();}
72 int getAll(int iSys, int iMem) const;
73 double getSHat(int iSys) const {return systems[iSys].sHat;}
75 // Find system of given outgoing parton, optionally also incoming one.
76 int getSystemOf(int iPos, bool alsoIn = false) const;
78 // Find iOut index of given system and event record index
79 int getIndexOfOut(int iSys, int iPos) const;
81 // List all current systems.
82 void list(ostream& os = cout) const;
86 // List of all separate partonic subsystems.
87 vector<PartonSystem> systems;
91 //==========================================================================
93 } // end namespace Pythia8
95 #endif // Pythia8_PartonSystems_H