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File indexing completed on 2024-04-06 12:31:17
0001 // 0002 // 0003 // File: hitfit/private/Constraint.h 0004 // Purpose: Represent a mass constraint equation. 0005 // Created: Jul, 2000, sss, based on run 1 mass analysis code. 0006 // 0007 // This class represents a mass constraint equation. 0008 // Mass constraints come in two varieties, either saying that the sum 0009 // of a set of labels should equal a constant: 0010 // 0011 // (1 + 2) = 80 0012 // 0013 // or that two such sums should equal each other: 0014 // 0015 // (1 + 2) = (3 + 4) 0016 // 0017 // We represent such a constraint equation by two Constraint_Intermed 0018 // instances, each of which represents one side of the equation. 0019 // 0020 // CMSSW File : interface/Constraint.h 0021 // Original Author : Scott Stuart Snyder <snyder@bnl.gov> for D0 0022 // Imported to CMSSW by Haryo Sumowidagdo <Suharyo.Sumowidagdo@cern.ch> 0023 0024 /** 0025 @file Constraint.h 0026 0027 @brief Represent a mass constraint equation. 0028 0029 @par Creation date: 0030 July 2000. 0031 0032 @author 0033 Scott Stuart Snyder <snyder@bnl.gov>. 0034 0035 @par Modification History: 0036 Apr 2009: Haryo Sumowidagdo <Suharyo.Sumowidagdo@cern.ch>: 0037 Imported to CMSSW.<br> 0038 Oct 2009: Haryo Sumowidagdo <Suharyo.Sumowidagdo@cern.ch>: 0039 Added Doxygen tags for automatic generation of documentation. 0040 0041 @par Terms of Usage: 0042 With consent from the original author (Scott Snyder). 0043 */ 0044 0045 #ifndef HITFIT_CONSTRAINT_H 0046 #define HITFIT_CONSTRAINT_H 0047 0048 #include <memory> 0049 #include <string> 0050 #include "TopQuarkAnalysis/TopHitFit/interface/Constraint_Intermed.h" 0051 0052 namespace hitfit { 0053 0054 class Fourvec_Event; 0055 0056 /** 0057 @class Constraint. 0058 0059 @brief Represent a mass constraint equation. Mass constraints 0060 come in two varieties, either saying that the sum of a set of labels 0061 should equal a constant:<br> 0062 0063 \f$(1 + 2) = C\f$.<br> 0064 0065 or that two such sums should be equal to each other:<br> 0066 0067 \f$(1 + 2) = (3 + 4)\f$.<br> 0068 0069 We represent such a constraint equation by two Constraint_Intermed 0070 instances, each of which represents one side of the equation. 0071 0072 */ 0073 class Constraint 0074 // 0075 // Purpose: Represent a mass constraint equation. 0076 // 0077 { 0078 public: 0079 // Constructor, destructor. S is the string to parse describing 0080 // the constraint. 0081 0082 /** 0083 Constructor. 0084 0085 @param s The string to parse describing the constraint. 0086 */ 0087 Constraint(std::string s); 0088 0089 /** 0090 Copy constructor. 0091 0092 @param c The original object to be copied. 0093 */ 0094 Constraint(const Constraint& c); 0095 0096 /** 0097 Destructor. 0098 */ 0099 ~Constraint() {} 0100 0101 // Assignment. 0102 /** 0103 Assignment operator. 0104 0105 @param c The original object to be copied. 0106 */ 0107 Constraint& operator=(const Constraint& c); 0108 0109 // See if this guy references both labels ILABEL and JLABEL 0110 // on a single side of the constraint equation. 0111 0112 /** 0113 See if this guy references both labels <i>ilabel</i> and <i>jlabel</i> 0114 on a single single side of the constraint equation. 0115 0116 @param ilabel The first label to test. 0117 @param jlabel The second label to test. 0118 0119 @par Return: 0120 - +1 if the LHS references both. 0121 - -1 if the RHS references both. 0122 - 0 if neither reference both. 0123 */ 0124 int has_labels(int ilabel, int jlabel) const; 0125 0126 // Evaluate the mass constraint, using the data in EV. 0127 // Return m(lhs)^2/2 - m(rhs)^2/2. 0128 /** 0129 Evaluate the mass constraint, using the data in <i>ev</i>. 0130 0131 @param ev The event for which the constraint should be evaluated. 0132 0133 @par Return: 0134 \f$ \frac{m(\rm{lhs})^{2}}{2} - \frac{m(\rm{rhs})^{2}}{2}\f$ 0135 */ 0136 double sum_mass_terms(const Fourvec_Event& ev) const; 0137 0138 // Print this object. 0139 friend std::ostream& operator<<(std::ostream& s, const Constraint& c); 0140 0141 private: 0142 // The two sides of the constraint. 0143 0144 /** 0145 Left hand side of the constraint. 0146 */ 0147 std::unique_ptr<Constraint_Intermed> _lhs; 0148 0149 /** 0150 Right hand side of the constraint. 0151 */ 0152 std::unique_ptr<Constraint_Intermed> _rhs; 0153 }; 0154 0155 } // namespace hitfit 0156 0157 #endif // not HITFIT_CONSTRAINT_H
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