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File indexing completed on 2024-04-06 12:31:17
0001 // 0002 // 0003 // File: hitfit/gentop.h 0004 // Purpose: Toy ttbar event generator for testing. 0005 // Created: Jul, 2000, sss. 0006 // 0007 // This is a very simple event generator for ttbar events, to allow some 0008 // basic tests of the mass fitting code. We generate random ttbars, 0009 // with kinematics pulled out of a hat, and then decay them into l+jets 0010 // events. No radiation or other such luxuries, and, as mentioned, any 0011 // kinematic distribuions will certainly be wrong. But the generated 0012 // events should satisfy the l+jets mass constraints. 0013 // 0014 // CMSSW File : interface/gentop.h 0015 // Original Author : Scott Stuart Snyder <snyder@bnl.gov> for D0 0016 // Imported to CMSSW by Haryo Sumowidagdo <Suharyo.Sumowidagdo@cern.ch> 0017 // 0018 0019 /** 0020 @file gentop.h 0021 0022 @brief A toy event generator for 0023 \f$t\bar{t} \to \ell + 4~\mathrm{jets}\f$ events. 0024 0025 This is a very simple event generator for 0026 \f$t\bar{t} \to \ell + 4~\mathrm{jets}\f$ events, to allow some 0027 basic tests of the kinematic fitting code. The code generates random 0028 \f$t\bar{t}\f$ events with kinematics pulled out of a hat (a random 0029 number generator), and then decay them into 0030 \f$t\bar{t} \to \ell + 4~\mathrm{jets}\f$ events. No physics behind the 0031 generation except for four-momentum conservation and 0032 energy-mass-momentum relation. No luxuries such as radiation etc, and, 0033 as mentioned, any kinematic distribution will certainly not corresponding 0034 to physical reality. But the generated events should satisfy the 0035 \f$\ell + 4~\mathrm{jets}\f$ mass constraints, and therefore would be 0036 usable for testing. 0037 0038 @author Scott Stuart Snyder <snyder@bnl.gov> 0039 0040 @par Creation date: 0041 Jul 2000. 0042 0043 @par Modification History: 0044 Apr 2009: Haryo Sumowidagdo <Suharyo.Sumowidagdo@cern.ch>: 0045 Imported to CMSSW.<br> 0046 Nov 2009: Haryo Sumowidagdo <Suharyo.Sumowidagdo@cern.ch>: 0047 Added doxygen tags for automatic generation of documentation. 0048 0049 @par Terms of Usage: 0050 With consent for the original author (Scott Snyder). 0051 0052 */ 0053 0054 #include <string> 0055 #include <iosfwd> 0056 0057 #include "CLHEP/Random/Random.h" 0058 0059 namespace hitfit { 0060 0061 class Defaults; 0062 class Lepjets_Event; 0063 0064 /** 0065 @class Gentop_Args. 0066 0067 @brief Hold on to parameters for the toy event generator. 0068 */ 0069 class Gentop_Args 0070 // 0071 // Hold on to parameters for the toy event generator. 0072 // float mt - Generated top mass. 0073 // float sigma_mt - Width of top mass distribution. 0074 // 0075 // float mh - Generated Higgs mass. 0076 // float sigma_mh - Width of Higgs mass distribution. 0077 // 0078 // float mw - Generated W mass. 0079 // float sigma_mw - Width of W mass distribution. 0080 // 0081 // float mb - Generated b mass. 0082 // float sigma_mb - Width of b mass distribution. 0083 // 0084 // float t_pt_mean - Mean pt of the generated top quarks. 0085 // (It will be drawn from an exponential distribution.) 0086 // float recoil_pt_mean-Mean pt of ttbar system. 0087 // (It will be drawn from an exponential distribution.) 0088 // float boost_sigma - Width of z-boost of ttbar system. 0089 // float m_boost - Mass of z-boost of ttbar system. 0090 // float sxv_tageff - Assumed efficiency of SVX b-tag. 0091 // bool smear - If true, smear the event. 0092 // bool smear_dir - If false, smear only energies, not directions. 0093 // bool muon - If false, decay leptonic ts into electrons. 0094 // Otherwise, decay into muons. 0095 // string ele_res_str - Electron resolution, for Vector_Resolution. 0096 // string muo_res_str - Muon resolution, for Vector_Resolution. 0097 // string jet_res_str - Jet resolution, for Vector_Resolution. 0098 // string kt_res_str - Kt resolution, for Resolution. 0099 // 0100 { 0101 public: 0102 // Constructor. Initialize from a Defaults object. 0103 /** 0104 @brief Constructor, initialize an instance of Gentop_Args from 0105 an instance of Defaults object. 0106 0107 @param defs The defaults instance from which to initialize. 0108 The instance must contain the following parameters with types 0109 and names: 0110 - double <i>t_pt_mean</i>. 0111 - double <i>mt</i>. 0112 - double <i>sigma_mt</i>. 0113 - double <i>mh</i>. 0114 - double <i>sigma_mh</i>. 0115 - double <i>recoil_pt_mean</i>. 0116 - double <i>boost_sigma</i>. 0117 - double <i>m_boost</i>. 0118 - double <i>mb</i>. 0119 - double <i>sigma_mb</i>. 0120 - double <i>mw</i>. 0121 - double <i>sigma_mw</i>. 0122 - double <i>svx_tageff</i>. 0123 - bool <i>smear</i>. 0124 - bool <i>smear_dir</i>. 0125 - bool <i>muon</i>. 0126 - string <i>ele_res_str</i>. 0127 - string <i>muo_res_str</i>. 0128 - string <i>jet_res_str</i>. 0129 - string <i>kt_res_str</i>. 0130 */ 0131 Gentop_Args(const Defaults& defs); 0132 0133 // Retrieve parameter values. 0134 0135 /** 0136 @brief Return the value of <i>t_pt_mean</i> parameter. 0137 */ 0138 double t_pt_mean() const; 0139 0140 /** 0141 @brief Return the value of <i>mt</i> parameter. 0142 */ 0143 double mt() const; 0144 0145 /** 0146 @brief Return the value of <i>sigma_mt</i> parameter. 0147 */ 0148 double sigma_mt() const; 0149 0150 /** 0151 @brief Return the value of <i>mh</i> parameter. 0152 */ 0153 double mh() const; 0154 0155 /** 0156 @brief Return the value of <i>sigma_mh</i> parameter. 0157 */ 0158 double sigma_mh() const; 0159 0160 /** 0161 @brief Return the value of <i>recoil_pt_mean</i> parameter. 0162 */ 0163 double recoil_pt_mean() const; 0164 0165 /** 0166 @brief Return the value of <i>boost_sigma</i> parameter. 0167 */ 0168 double boost_sigma() const; 0169 0170 /** 0171 @brief Return the value of <i>m_boost</i> parameter. 0172 */ 0173 double m_boost() const; 0174 0175 /** 0176 @brief Return the value of <i>mb</i> parameter. 0177 */ 0178 double mb() const; 0179 0180 /** 0181 @brief Return the value of <i>sigma_mb</i> parameter. 0182 */ 0183 double sigma_mb() const; 0184 0185 /** 0186 @brief Return the value of <i>mw</i> parameter. 0187 */ 0188 double mw() const; 0189 0190 /** 0191 @brief Return the value of <i>sigma_mw</i> parameter. 0192 */ 0193 double sigma_mw() const; 0194 0195 /** 0196 @brief Return the value of <i>svx_tageff</i> parameter. 0197 */ 0198 double svx_tageff() const; 0199 0200 /** 0201 @brief Return the value of <i>smear</i> parameter. 0202 */ 0203 bool smear() const; 0204 0205 /** 0206 @brief Return the value of <i>smear_dir</i> parameter. 0207 */ 0208 bool smear_dir() const; 0209 0210 /** 0211 @brief Return the value of <i>muon</i> parameter. 0212 */ 0213 bool muon() const; 0214 0215 /** 0216 @brief Return the value of <i>ele_res_str</i> parameter. 0217 */ 0218 std::string ele_res_str() const; 0219 0220 /** 0221 @brief Return the value of <i>muon_res_str</i> parameter. 0222 */ 0223 std::string muo_res_str() const; 0224 0225 /** 0226 @brief Return the value of <i>jet_res_str</i> parameter. 0227 */ 0228 std::string jet_res_str() const; 0229 0230 /** 0231 @brief Return the value of <i>kt_res_str</i> parameter. 0232 */ 0233 std::string kt_res_str() const; 0234 0235 private: 0236 // Hold on to parameter values. 0237 0238 /** 0239 Mean transverse momentum \f$p_{T}\f$ of the generated top quarks, in GeV, 0240 drawn from an exponential distribution. 0241 */ 0242 double _t_pt_mean; 0243 0244 /** 0245 Mass of the generated top quark, in GeV. 0246 */ 0247 double _mt; 0248 0249 /** 0250 Width of the generated top quark mass distribution, in GeV. 0251 */ 0252 double _sigma_mt; 0253 0254 /** 0255 Mass of the generated Higgs boson, in GeV. 0256 */ 0257 double _mh; 0258 0259 /** 0260 Width of the generated Higgs boson mass distribution, in GeV. 0261 */ 0262 double _sigma_mh; 0263 0264 /** 0265 Mean transverse momentum \f$p_{T}\f$ of the generated \f$t\bar{t}\f$ 0266 system, in GeV, drawn from an exponential distribution. 0267 */ 0268 double _recoil_pt_mean; 0269 0270 /** 0271 Width of the \f$z-\f$boost of the \f$t\bar{t}\f$ system, in GeV. 0272 */ 0273 double _boost_sigma; 0274 0275 /** 0276 Mass of the \f$z-\f$boost of the \f$t\bar{t}\f$ system, in GeV. 0277 */ 0278 double _m_boost; 0279 0280 /** 0281 Mass of the generated <i>b</i> quark, in GeV. 0282 */ 0283 double _mb; 0284 0285 /** 0286 Width of the generated <i>b</i> quark mass distribution, in GeV. 0287 */ 0288 double _sigma_mb; 0289 0290 /** 0291 Mass of the generated <i>W</i> boson, in GeV. 0292 */ 0293 double _mw; 0294 0295 /** 0296 Width of the generated <i>W</i> boson mass, in GeV. 0297 */ 0298 double _sigma_mw; 0299 0300 /** 0301 Assumed efficiency of SVX (Secondary Vertex) b-tagging, for most cases 0302 it is irrelevant. 0303 */ 0304 double _svx_tageff; 0305 0306 /** 0307 If TRUE, smear the event.<br> 0308 If FALSE, don't smear the event. 0309 */ 0310 bool _smear; 0311 0312 /** 0313 If TRUE, smear the energy and direction of individual particles.<br> 0314 If FALSE, only smear the energy of individual particle. 0315 */ 0316 bool _smear_dir; 0317 0318 /** 0319 If TRUE, decay the leptonic top quark into muon.<br> 0320 If FALSE, decay the leptonic top quark into electron. 0321 */ 0322 bool _muon; 0323 0324 /** 0325 Electron resolution information in format suitable for Vector_Resolution. 0326 */ 0327 std::string _ele_res_str; 0328 0329 /** 0330 Muon resolution information in format suitable for Vector_Resolution. 0331 */ 0332 std::string _muo_res_str; 0333 0334 /** 0335 Jet resolution information in format suitable for Vector_Resolution. 0336 */ 0337 std::string _jet_res_str; 0338 0339 /** 0340 \f$k_{T}\f$ resolution information in format suitable for 0341 Vector_Resolution. 0342 */ 0343 std::string _kt_res_str; 0344 }; 0345 0346 // Generate a ttbar -> ljets event. 0347 /** 0348 @brief Generate a \f$t\bar{t} \to \ell + 4~\mathrm{jets}\f$ event. 0349 0350 @param args The parameter settings for this event. 0351 0352 @param engine The underlying random number generator. 0353 */ 0354 Lepjets_Event gentop(const Gentop_Args& args, CLHEP::HepRandomEngine& engine); 0355 0356 // Generate a ttH -> ljets+bb event. 0357 /** 0358 @brief Generate a \f$t\bar{t}H \to \ell + b\bar{b} + 4~\mathrm{jets}\f$ 0359 event. 0360 0361 @param args The parameter settings for this event. 0362 0363 @param engine The underlying random number generator. 0364 */ 0365 Lepjets_Event gentth(const Gentop_Args& args, CLHEP::HepRandomEngine& engine); 0366 0367 } // namespace hitfit
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