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