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25 // 25 //
26 // 26 //
27 27
28 28
29 // ------------------------------------------- 29 // ------------------------------------------------------------
30 // GEANT 4 class implementation file 30 // GEANT 4 class implementation file
31 // 31 //
32 // ---------------- G4FragmentingString - 32 // ---------------- G4FragmentingString ----------------
33 // by Gunter Folger, September 200 33 // by Gunter Folger, September 2001.
34 // class for an excited string used in F 34 // class for an excited string used in Fragmention
35 // ------------------------------------------- 35 // ------------------------------------------------------------
36 36
37 37
38 // G4FragmentingString 38 // G4FragmentingString
39 #include "G4FragmentingString.hh" 39 #include "G4FragmentingString.hh"
40 #include "G4ExcitedString.hh" 40 #include "G4ExcitedString.hh"
41 41
42 //-------------------------------------------- 42 //---------------------------------------------------------------------------------
43 43
44 //-------------------------------------------- 44 //---------------------------------------------------------------------------------
45 45
46 G4FragmentingString::G4FragmentingString(const 46 G4FragmentingString::G4FragmentingString(const G4FragmentingString &old)
47 { 47 {
48 LeftParton=old.LeftParton; 48 LeftParton=old.LeftParton;
49 RightParton=old.RightParton; 49 RightParton=old.RightParton;
50 Ptleft=old.Ptleft; 50 Ptleft=old.Ptleft;
51 Ptright=old.Ptright; 51 Ptright=old.Ptright;
52 Pplus=old.Pplus; 52 Pplus=old.Pplus;
53 Pminus=old.Pminus; 53 Pminus=old.Pminus;
54 theStableParton=old.theStableParton; <<
55 theDecayParton=old.theDecayParton; <<
56 decaying=old.decaying; 54 decaying=old.decaying;
57 Pstring=old.Pstring; <<
58 Pleft =old.Pleft; <<
59 Pright =old.Pright; <<
60 } <<
61 <<
62 G4FragmentingString & G4FragmentingString::ope <<
63 { <<
64 if (this != &old) <<
65 { <<
66 LeftParton=old.LeftParton; <<
67 RightParton=old.RightParton; <<
68 Ptleft=old.Ptleft; <<
69 Ptright=old.Ptright; <<
70 Pplus=old.Pplus; <<
71 Pminus=old.Pminus; <<
72 theStableParton=old.theStableParton; <<
73 theDecayParton=old.theDecayParton; <<
74 decaying=old.decaying; <<
75 Pstring=old.Pstring; <<
76 Pleft =old.Pleft; <<
77 Pright =old.Pright; <<
78 } <<
79 return *this; <<
80 } 55 }
81 56
82 //-------------------------------------------- 57 //---------------------------------------------------------------------------------
83 58
84 G4FragmentingString::G4FragmentingString(const 59 G4FragmentingString::G4FragmentingString(const G4ExcitedString &excited)
85 { 60 {
86 LeftParton=excited.GetLeftParton()->GetDefin 61 LeftParton=excited.GetLeftParton()->GetDefinition();
87 RightParton=excited.GetRightParton()->GetDef 62 RightParton=excited.GetRightParton()->GetDefinition();
88 Ptleft=excited.GetLeftParton()->Get4Momentum 63 Ptleft=excited.GetLeftParton()->Get4Momentum().vect();
89 Ptleft.setZ(0.); 64 Ptleft.setZ(0.);
90 Ptright=excited.GetRightParton()->Get4Moment 65 Ptright=excited.GetRightParton()->Get4Momentum().vect();
91 Ptright.setZ(0.); 66 Ptright.setZ(0.);
92 theStableParton=0; << 67 G4LorentzVector P=excited.Get4Momentum();
93 theDecayParton=0; << 68 Pplus =P.e() + P.pz();
94 << 69 Pminus=P.e() - P.pz();
95 if (excited.GetDirection() > 0) {decay << 70 decaying=None;
96 else {decay <<
97 <<
98 Pleft = excited.GetLeftParton()->Get4 <<
99 Pright = excited.GetRightParton()->Get <<
100 Pstring= Pleft + Pright; <<
101 <<
102 Pplus = Pstring.plus(); <<
103 Pminus = Pstring.minus(); <<
104 } 71 }
105 72
106 //-------------------------------------------- 73 //---------------------------------------------------------------------------------
107 74
108 G4FragmentingString::G4FragmentingString(const 75 G4FragmentingString::G4FragmentingString(const G4FragmentingString &old,
109 G4ParticleDefinition * newdecay, 76 G4ParticleDefinition * newdecay,
110 const G4LorentzVector *momentum) 77 const G4LorentzVector *momentum)
111 { 78 {
112 decaying=None; 79 decaying=None;
113 // Momentum of produced hadron << 80 if ( old.decaying == Left )
114 G4LorentzVector Momentum = G4LorentzVe <<
115 <<
116 if ( old.decaying == Left ) <<
117 { <<
118 RightParton= old.RightParton; <<
119 Ptright = old.Ptright; <<
120 Pright = old.Pright; <<
121 <<
122 LeftParton = newdecay; <<
123 Ptleft = old.Ptleft - mome <<
124 Ptleft.setZ(0.); <<
125 Pleft = old.Pleft - Momentum; <<
126 <<
127 Pstring = Pleft + Pright; <<
128 Pplus = Pstring.plus(); <<
129 Pminus = Pstring.minus(); <<
130 <<
131 theDecayParton=GetLeftParton() <<
132 theStableParton=GetRightParton <<
133 decaying = Left; <<
134 } else if ( old.decaying == Right ) <<
135 { <<
136 RightParton = newdecay; <<
137 Ptright = old.Ptright - mo <<
138 Ptright.setZ(0.); <<
139 Pright = old.Pright - Momentum <<
140 <<
141 LeftParton = old.LeftParton; <<
142 Ptleft = old.Ptleft; <<
143 Pleft = old.Pleft; <<
144 <<
145 Pstring = Pleft + Pright; <<
146 Pplus = Pstring.plus(); <<
147 Pminus = Pstring.minus(); <<
148 <<
149 theDecayParton=GetRightParton( <<
150 theStableParton=GetLeftParton( <<
151 decaying = Right; <<
152 } else <<
153 { 81 {
154 throw G4HadronicException(__FILE__, __LINE << 82 RightParton= old.RightParton;
155 "G4FragmentingString::G4Frag << 83 Ptright = old.Ptright;
156 } << 84 LeftParton = newdecay;
157 } << 85 Ptleft = old.Ptleft - momentum->vect();
158 << 86 Ptleft.setZ(0.);
159 << 87 } else if ( old.decaying == Right )
160 //-------------------------------------------- <<
161 <<
162 G4FragmentingString::G4FragmentingString(const <<
163 G4ParticleDefinition * newdecay) <<
164 { <<
165 decaying=None; <<
166 <<
167 Ptleft.setX(0.); Ptleft.setY(0.); Pt <<
168 Ptright.setX(0.); Ptright.setY(0.); Pt <<
169 Pplus=0.; Pminus=0.; <<
170 theStableParton=0; theDecayParton=0; <<
171 <<
172 Pstring=G4LorentzVector(0.,0.,0.,0.); <<
173 Pleft =G4LorentzVector(0.,0.,0.,0.); <<
174 Pright =G4LorentzVector(0.,0.,0.,0.); <<
175 <<
176 if ( old.decaying == Left ) <<
177 { <<
178 RightParton= old.RightParton; <<
179 LeftParton = newdecay; <<
180 decaying=Left; <<
181 } else if ( old.decaying == Right ) <<
182 { <<
183 RightParton = newdecay; <<
184 LeftParton = old.LeftParton; <<
185 decaying=Right; <<
186 } else <<
187 { 88 {
188 throw G4HadronicException(__FILE__, __LINE << 89 RightParton = newdecay;
189 "G4FragmentingString::G4Frag << 90 Ptright = old.Ptright - momentum->vect();
>> 91 Ptright.setZ(0.);
>> 92 LeftParton = old.LeftParton;
>> 93 Ptleft = old.Ptleft;
>> 94 } else
>> 95 {
>> 96 throw G4HadronicException(__FILE__, __LINE__, "G4FragmentingString::G4FragmentingString: no decay Direction defined");
190 } 97 }
>> 98 Pplus = old.Pplus - (momentum->e() + momentum->pz());
>> 99 Pminus = old.Pminus - (momentum->e() - momentum->pz());
>> 100
>> 101 //G4double Eold=0.5 * (old.Pplus + old.Pminus);
>> 102 //G4double Enew=0.5 * (Pplus + Pminus);
191 } 103 }
192 104
193 105
194 //-------------------------------------------- 106 //---------------------------------------------------------------------------------
195 107
196 G4FragmentingString::~G4FragmentingString() 108 G4FragmentingString::~G4FragmentingString()
197 {} 109 {}
198 110
>> 111
199 //-------------------------------------------- 112 //---------------------------------------------------------------------------------
200 113
201 void G4FragmentingString::SetLeftPartonStable( 114 void G4FragmentingString::SetLeftPartonStable()
202 { 115 {
203 theStableParton=GetLeftParton(); 116 theStableParton=GetLeftParton();
204 theDecayParton=GetRightParton(); 117 theDecayParton=GetRightParton();
205 decaying=Right; 118 decaying=Right;
206 } 119 }
207 120
208 //-------------------------------------------- 121 //---------------------------------------------------------------------------------
209 122
210 void G4FragmentingString::SetRightPartonStable 123 void G4FragmentingString::SetRightPartonStable()
211 { 124 {
212 theStableParton=GetRightParton(); 125 theStableParton=GetRightParton();
213 theDecayParton=GetLeftParton(); 126 theDecayParton=GetLeftParton();
214 decaying=Left; 127 decaying=Left;
215 } 128 }
216 129
217 //-------------------------------------------- 130 //---------------------------------------------------------------------------------
218 131
219 G4int G4FragmentingString::GetDecayDirection() 132 G4int G4FragmentingString::GetDecayDirection() const
220 { 133 {
221 if (decaying == Left ) return +1; 134 if (decaying == Left ) return +1;
222 else if (decaying == Right) return -1; 135 else if (decaying == Right) return -1;
223 else throw G4HadronicException(__FILE__, __L << 136 else throw G4HadronicException(__FILE__, __LINE__, "G4FragmentingString::GetDecayDirection: decay side UNdefined!");
224 "G4FragmentingString::GetDecayD <<
225 return 0; 137 return 0;
226 } 138 }
227 139
228 //-------------------------------------------- 140 //---------------------------------------------------------------------------------
229 141
230 G4bool G4FragmentingString::IsAFourQuarkString << 142 G4bool G4FragmentingString::FourQuarkString() const
231 { 143 {
232 return LeftParton->GetParticleSubType()== 144 return LeftParton->GetParticleSubType()== "di_quark"
233 && RightParton->GetParticleSubType()== 145 && RightParton->GetParticleSubType()== "di_quark";
234 } 146 }
235 147
236 //-------------------------------------------- 148 //---------------------------------------------------------------------------------
237 149
238 G4bool G4FragmentingString::DecayIsQuark() 150 G4bool G4FragmentingString::DecayIsQuark()
239 { 151 {
240 return theDecayParton->GetParticleSubType()= 152 return theDecayParton->GetParticleSubType()== "quark";
241 } 153 }
242 154
243 G4bool G4FragmentingString::StableIsQuark() 155 G4bool G4FragmentingString::StableIsQuark()
244 { 156 {
245 return theStableParton->GetParticleSubType() 157 return theStableParton->GetParticleSubType()== "quark";
246 } 158 }
247 159
248 //-------------------------------------------- 160 //---------------------------------------------------------------------------------
249 161
250 G4ThreeVector G4FragmentingString::StablePt() 162 G4ThreeVector G4FragmentingString::StablePt()
251 { 163 {
252 if (decaying == Left ) return Ptright; 164 if (decaying == Left ) return Ptright;
253 else if (decaying == Right ) return Ptleft; 165 else if (decaying == Right ) return Ptleft;
254 else throw G4HadronicException(__FILE__, __L 166 else throw G4HadronicException(__FILE__, __LINE__, "G4FragmentingString::DecayPt: decay side UNdefined!");
255 return G4ThreeVector(); 167 return G4ThreeVector();
256 } 168 }
257 169
258 G4ThreeVector G4FragmentingString::DecayPt() 170 G4ThreeVector G4FragmentingString::DecayPt()
259 { 171 {
260 if (decaying == Left ) return Ptleft; 172 if (decaying == Left ) return Ptleft;
261 else if (decaying == Right ) return Ptright; 173 else if (decaying == Right ) return Ptright;
262 else throw G4HadronicException(__FILE__, __L 174 else throw G4HadronicException(__FILE__, __LINE__, "G4FragmentingString::DecayPt: decay side UNdefined!");
263 return G4ThreeVector(); 175 return G4ThreeVector();
264 } 176 }
265 177
266 //-------------------------------------------- 178 //---------------------------------------------------------------------------------
267 179
268 G4double G4FragmentingString::LightConePlus() 180 G4double G4FragmentingString::LightConePlus()
269 { 181 {
270 return Pplus; 182 return Pplus;
271 } 183 }
272 184
273 G4double G4FragmentingString::LightConeMinus() 185 G4double G4FragmentingString::LightConeMinus()
274 { 186 {
275 return Pminus; 187 return Pminus;
276 } 188 }
277 189
278 G4double G4FragmentingString::LightConeDecay() 190 G4double G4FragmentingString::LightConeDecay()
279 { 191 {
280 if (decaying == Left ) return Pplus; 192 if (decaying == Left ) return Pplus;
281 else if (decaying == Right ) return Pminus; 193 else if (decaying == Right ) return Pminus;
282 else throw G4HadronicException(__FILE__, __L 194 else throw G4HadronicException(__FILE__, __LINE__, "G4FragmentingString::DecayPt: decay side UNdefined!");
>> 195 return 0;
283 } 196 }
284 197
285 //-------------------------------------------- 198 //---------------------------------------------------------------------------------
286 199
287 G4LorentzVector G4FragmentingString::Get4Momen 200 G4LorentzVector G4FragmentingString::Get4Momentum() const
288 { 201 {
289 return Pstring; << 202 G4LorentzVector momentum(Ptleft+Ptright,0);
>> 203 momentum.setPz(0.5*(Pplus-Pminus));
>> 204 momentum.setE(0.5*(Pplus+Pminus));
>> 205 return momentum;
290 } 206 }
291 207
292 G4double G4FragmentingString::Mass2() const 208 G4double G4FragmentingString::Mass2() const
293 { 209 {
294 return Pstring.mag2(); << 210 return Pplus*Pminus - (Ptleft+Ptright).mag2();
295 } 211 }
296 212
297 G4double G4FragmentingString::Mass() const 213 G4double G4FragmentingString::Mass() const
298 { 214 {
299 return Pstring.mag(); << 215 return std::sqrt(this->Mass2());
300 } <<
301 <<
302 G4double G4FragmentingString::MassT2() const <<
303 { <<
304 return Pplus*Pminus; <<
305 } <<
306 <<
307 G4LorentzVector G4FragmentingString::GetPstrin <<
308 { <<
309 return Pstring; <<
310 } <<
311 <<
312 G4LorentzVector G4FragmentingString::GetPleft( <<
313 { <<
314 return Pleft; <<
315 } <<
316 <<
317 G4LorentzVector G4FragmentingString::GetPright <<
318 { <<
319 return Pright; <<
320 } <<
321 <<
322 G4LorentzRotation G4FragmentingString::Transfo <<
323 { <<
324 G4LorentzVector momentum = Pstring; <<
325 G4LorentzRotation toAlignedCms(-1*momentu <<
326 momentum = toAlignedCms * Pleft; <<
327 <<
328 toAlignedCms.rotateZ(-1*momentum.phi()); <<
329 toAlignedCms.rotateY(-1*momentum.theta()) <<
330 <<
331 Pleft *= toAlignedCms; <<
332 Pright *= toAlignedCms; <<
333 Pstring *= toAlignedCms; <<
334 <<
335 Ptleft = G4ThreeVector(Pleft.vect()); <<
336 Ptleft.setZ(0.); <<
337 Ptright = G4ThreeVector(Pright.vect()); <<
338 Pplus = Pstring.plus(); <<
339 Pminus = Pstring.minus(); <<
340 <<
341 return toAlignedCms; <<
342 } 216 }
343 217