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