[819] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // Historic fragment from M.Komogorov; clean-up still necessary @@@ |
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| 27 | #include "G4ExcitedStringDecay.hh" |
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| 28 | #include "G4KineticTrack.hh" |
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| 29 | |
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| 30 | G4ExcitedStringDecay::G4ExcitedStringDecay() |
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| 31 | { |
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| 32 | theStringDecay=NULL; |
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| 33 | } |
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| 34 | |
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| 35 | G4ExcitedStringDecay::G4ExcitedStringDecay(G4VLongitudinalStringDecay * aStringDecay) |
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| 36 | : theStringDecay(aStringDecay) |
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| 37 | {} |
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| 38 | |
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| 39 | G4ExcitedStringDecay::G4ExcitedStringDecay(const G4ExcitedStringDecay &) : G4VStringFragmentation() |
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| 40 | { |
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| 41 | } |
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| 42 | |
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| 43 | G4ExcitedStringDecay::~G4ExcitedStringDecay() |
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| 44 | { |
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| 45 | } |
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| 46 | |
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| 47 | const G4ExcitedStringDecay & G4ExcitedStringDecay::operator=(const G4ExcitedStringDecay &) |
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| 48 | { |
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| 49 | throw G4HadronicException(__FILE__, __LINE__, "G4ExcitedStringDecay::operator= meant to not be accessable"); |
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| 50 | return *this; |
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| 51 | } |
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| 52 | |
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| 53 | int G4ExcitedStringDecay::operator==(const G4ExcitedStringDecay &) const |
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| 54 | { |
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| 55 | return 0; |
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| 56 | } |
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| 57 | |
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| 58 | int G4ExcitedStringDecay::operator!=(const G4ExcitedStringDecay &) const |
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| 59 | { |
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| 60 | return 1; |
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| 61 | } |
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| 62 | |
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| 63 | G4bool G4ExcitedStringDecay:: |
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| 64 | EnergyAndMomentumCorrector(G4KineticTrackVector* Output, G4LorentzVector& TotalCollisionMom) |
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| 65 | { |
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| 66 | const int nAttemptScale = 500; |
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| 67 | const double ErrLimit = 1.E-5; |
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| 68 | if (Output->empty()) |
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| 69 | return TRUE; |
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| 70 | G4LorentzVector SumMom; |
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| 71 | G4double SumMass = 0; |
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| 72 | G4double TotalCollisionMass = TotalCollisionMom.m(); |
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| 73 | if( !(TotalCollisionMass<1) && !(TotalCollisionMass>-1) ) |
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| 74 | { |
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| 75 | std::cout << "TotalCollisionMomentum = "<<TotalCollisionMom<<G4endl; |
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| 76 | throw G4HadronicException(__FILE__, __LINE__, "G4ExcitedStringDecay received nan mass..."); |
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| 77 | } |
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| 78 | // Calculate sum hadron 4-momenta and summing hadron mass |
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| 79 | unsigned int cHadron; |
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| 80 | for(cHadron = 0; cHadron < Output->size(); cHadron++) |
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| 81 | { |
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| 82 | SumMom += Output->operator[](cHadron)->Get4Momentum(); |
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| 83 | if( !(SumMom<1) && !(SumMom>-1) ) |
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| 84 | { |
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| 85 | throw G4HadronicException(__FILE__, __LINE__, "G4ExcitedStringDecay::EnergyAndMomentumCorrector() received nan momentum..."); |
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| 86 | } |
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| 87 | SumMass += Output->operator[](cHadron)->GetDefinition()->GetPDGMass(); |
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| 88 | if( !(SumMass<1) && !(SumMass>-1) ) |
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| 89 | { |
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| 90 | throw G4HadronicException(__FILE__, __LINE__, "G4ExcitedStringDecay::EnergyAndMomentumCorrector() received nan mass..."); |
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| 91 | } |
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| 92 | } |
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| 93 | // Cannot correct a single particle |
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| 94 | if (Output->size() < 2) return FALSE; |
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| 95 | |
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| 96 | if (SumMass > TotalCollisionMass) return FALSE; |
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| 97 | SumMass = SumMom.m2(); |
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| 98 | if (SumMass < 0) return FALSE; |
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| 99 | SumMass = std::sqrt(SumMass); |
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| 100 | |
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| 101 | // Compute c.m.s. hadron velocity and boost KTV to hadron c.m.s. |
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| 102 | G4ThreeVector Beta = -SumMom.boostVector(); |
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| 103 | Output->Boost(Beta); |
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| 104 | |
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| 105 | // Scale total c.m.s. hadron energy (hadron system mass). |
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| 106 | // It should be equal interaction mass |
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| 107 | G4double Scale = 1; |
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| 108 | G4int cAttempt = 0; |
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| 109 | G4double Sum = 0; |
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| 110 | G4bool success = false; |
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| 111 | for(cAttempt = 0; cAttempt < nAttemptScale; cAttempt++) |
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| 112 | { |
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| 113 | Sum = 0; |
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| 114 | for(cHadron = 0; cHadron < Output->size(); cHadron++) |
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| 115 | { |
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| 116 | G4LorentzVector HadronMom = Output->operator[](cHadron)->Get4Momentum(); |
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| 117 | HadronMom.setVect(Scale*HadronMom.vect()); |
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| 118 | G4double E = std::sqrt(HadronMom.vect().mag2() + sqr(Output->operator[](cHadron)->GetDefinition()->GetPDGMass())); |
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| 119 | HadronMom.setE(E); |
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| 120 | Output->operator[](cHadron)->Set4Momentum(HadronMom); |
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| 121 | Sum += E; |
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| 122 | } |
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| 123 | Scale = TotalCollisionMass/Sum; |
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| 124 | #ifdef debug_G4ExcitedStringDecay |
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| 125 | G4cout << "Scale-1=" << Scale -1 |
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| 126 | << ", TotalCollisionMass=" << TotalCollisionMass |
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| 127 | << ", Sum=" << Sum |
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| 128 | << G4endl; |
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| 129 | #endif |
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| 130 | if (std::fabs(Scale - 1) <= ErrLimit) |
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| 131 | { |
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| 132 | success = true; |
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| 133 | break; |
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| 134 | } |
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| 135 | } |
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| 136 | |
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| 137 | if(!success) |
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| 138 | { |
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| 139 | G4cout << "G4ExcitedStringDecay::EnergyAndMomentumCorrector - Warning"<<G4endl; |
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| 140 | G4cout << " Scale not unity at end of iteration loop: "<<TotalCollisionMass<<" "<<Sum<<" "<<Scale<<G4endl; |
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| 141 | G4cout << " Number of secondaries: " << Output->size() << G4endl; |
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| 142 | G4cout << " Wanted total energy: " << TotalCollisionMom.e() << G4endl; |
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| 143 | G4cout << " Increase number of attempts or increase ERRLIMIT"<<G4endl; |
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| 144 | // throw G4HadronicException(__FILE__, __LINE__, "G4ExcitedStringDecay failed to correct..."); |
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| 145 | } |
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| 146 | |
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| 147 | // Compute c.m.s. interaction velocity and KTV back boost |
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| 148 | Beta = TotalCollisionMom.boostVector(); |
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| 149 | Output->Boost(Beta); |
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| 150 | return success; |
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| 151 | } |
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