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source: svn/trunk/Utilities/HepMC/interface/PdfInfo.h@ 930

Last change on this file since 930 was 572, checked in by cp3-support, 13 years ago

upgrade HepMC to version 2.06.05
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[349]1//--------------------------------------------------------------------------
2#ifndef HEPMC_PDF_INFO_H
3#define HEPMC_PDF_INFO_H
4
5//////////////////////////////////////////////////////////////////////////
6// garren@fnal.gov, July 2006
7//
8// Additional PDF information
9//////////////////////////////////////////////////////////////////////////
10
11namespace HepMC {
12
13//! The PdfInfo class stores PDF information
14
15///
16/// \class PdfInfo
17/// HepMC::PdfInfo stores additional PDF information for a GenEvent.
18/// Creation and use of this information is optional.
19///
20/// - int id1; // flavour code of first parton
21/// - int id2; // flavour code of second parton
22/// - int pdf_id1; // LHAPDF set id of first parton (zero by default)
23/// - int pdf_id2; // LHAPDF set id of second parton (zero by default)
24/// - double x1; // fraction of beam momentum carried by first parton ("beam side")
25/// - double x2; // fraction of beam momentum carried by second parton ("target side")
26/// - double scalePDF; // Q-scale used in evaluation of PDF's (in GeV)
27/// - double pdf1; // PDF (id1, x1, Q)
28/// - double pdf2; // PDF (id2, x2, Q)
29///
30/// Input parton flavour codes id1 & id2 are expected to obey the
31/// PDG code conventions, especially g = 21.
32///
33/// The contents of pdf1 and pdf2 are expected to be x*f(x).
34/// The LHAPDF set ids are the entries in the first column of
35/// http:///projects.hepforge.org/lhapdf/PDFsets.index
36///
37class PdfInfo {
38
39public:
40 // --- birth/death:
41 //
42 /// default constructor
43 PdfInfo()
44 : m_id1(0),
45 m_id2(0),
46 m_pdf_id1(0),
47 m_pdf_id2(0),
48 m_x1(0),
49 m_x2(0),
50 m_scalePDF(0),
51 m_pdf1(0),
52 m_pdf2(0)
53 {}
54
55 /// all values EXCEPT pdf_id1 and pdf_id2 must be provided
56 PdfInfo( int i1, int i2, double x1, double x2,
57 double q, double p1, double p2,
58 int pdf_id1 = 0, int pdf_id2 = 0 );
59
60 ~PdfInfo() {}
61
62 // --- copying:
63 //
64 PdfInfo( PdfInfo const & orig ); //!< copy constructor
65 PdfInfo & operator = ( PdfInfo const & rhs ); //!< make a copy
66 void swap( PdfInfo & other ); //!< swap two PdfInfo objects
67
68 // --- equivalence:
69 //
70 bool operator==( const PdfInfo& ) const; //!< check for equality
71 bool operator!=( const PdfInfo& ) const; //!< check for inequality
72
73 // --- accessors:
74 /// flavour code of first parton
75 int id1() const { return m_id1; }
76 /// flavour code of second parton
77 int id2() const { return m_id2; }
78 /// LHAPDF set id of first parton
79 int pdf_id1() const { return m_pdf_id1; }
80 /// LHAPDF set id of second parton
81 int pdf_id2() const { return m_pdf_id2; }
82 /// fraction of beam momentum carried by first parton ("beam side")
83 double x1() const { return m_x1; }
84 /// fraction of beam momentum carried by second parton ("target side")
85 double x2() const { return m_x2; }
86 /// Q-scale used in evaluation of PDF's (in GeV)
87 double scalePDF() const { return m_scalePDF; }
88 /// PDF (id1, x1, Q) - x*f(x)
89 double pdf1() const { return m_pdf1; }
90 /// PDF (id2, x2, Q) - x*f(x)
91 double pdf2() const { return m_pdf2; }
92
[572]93 /// verify that the instance contains non-zero information
94 bool is_valid() const;
95
[349]96 // --- mutators:
97 /// set flavour code of first parton
98 void set_id1(const int &i) { m_id1=i; }
99 /// set flavour code of second parton
100 void set_id2(const int &i) { m_id2=i; }
101 /// set LHAPDF set id of first parton
102 void set_pdf_id1(const int &i) { m_pdf_id1=i; }
103 /// set LHAPDF set id of second parton
104 void set_pdf_id2(const int &i) { m_pdf_id2=i; }
105 /// set fraction of beam momentum carried by first parton ("beam side")
106 void set_x1(const double &f) { m_x1=f; }
107 /// set fraction of beam momentum carried by second parton ("target side")
108 void set_x2(const double &f) { m_x2=f; }
109 /// set Q-scale used in evaluation of PDF's (in GeV)
110 void set_scalePDF(const double &f) { m_scalePDF=f; }
111 /// set x*f(x) of first parton
112 void set_pdf1(const double &f) { m_pdf1=f; }
113 /// set x*f(x) of second parton
114 void set_pdf2(const double &f) { m_pdf2=f; }
115
116private: // data members
117 int m_id1;
118 int m_id2;
119 int m_pdf_id1;
120 int m_pdf_id2;
121 double m_x1;
122 double m_x2;
123 double m_scalePDF;
124 double m_pdf1;
125 double m_pdf2;
126
127};
128
[572]129// Free Functions
130
131// IO
132std::ostream & operator << (std::ostream &, PdfInfo const *);
133std::istream & operator >> (std::istream &, PdfInfo *);
134
[349]135// inline operators
136inline PdfInfo::PdfInfo( int i1, int i2, double x1, double x2,
137 double q, double p1, double p2,
138 int pdf_id1, int pdf_id2 )
139 : m_id1(i1),
140 m_id2(i2),
141 m_pdf_id1(pdf_id1),
142 m_pdf_id2(pdf_id2),
143 m_x1(x1),
144 m_x2(x2),
145 m_scalePDF(q),
146 m_pdf1(p1),
147 m_pdf2(p2)
148 {}
149
150inline PdfInfo::PdfInfo( PdfInfo const & orig )
151 : m_id1(orig.m_id1),
152 m_id2(orig.m_id2),
153 m_pdf_id1(orig.m_pdf_id1),
154 m_pdf_id2(orig.m_pdf_id2),
155 m_x1(orig.m_x1),
156 m_x2(orig.m_x2),
157 m_scalePDF(orig.m_scalePDF),
158 m_pdf1(orig.m_pdf1),
159 m_pdf2(orig.m_pdf2)
160 {}
161
162inline PdfInfo & PdfInfo::operator = ( PdfInfo const & rhs )
163{
164 PdfInfo temp( rhs );
165 swap( temp );
166 return *this;
167}
168
169inline void PdfInfo::swap( PdfInfo & other )
170{
171 std::swap(m_id1, other.m_id1);
172 std::swap(m_id2, other.m_id2);
173 std::swap(m_pdf_id1, other.m_pdf_id1);
174 std::swap(m_pdf_id2, other.m_pdf_id2);
175 std::swap(m_x1, other.m_x1);
176 std::swap(m_x2, other.m_x2);
177 std::swap(m_scalePDF, other.m_scalePDF);
178 std::swap(m_pdf1, other.m_pdf1);
179 std::swap(m_pdf2, other.m_pdf2);
180}
181
182inline bool PdfInfo::operator==( const PdfInfo& a ) const
183{
184 /// equality requires that each member match
185 return ( a.id1() == this->id1()
186 && a.id2() == this->id2()
187 && a.pdf_id1() == this->pdf_id1()
188 && a.pdf_id2() == this->pdf_id2()
189 && a.x1() == this->x1()
190 && a.x2() == this->x2()
191 && a.scalePDF() == this->scalePDF()
192 && a.pdf1() == this->pdf1()
193 && a.pdf2() == this->pdf2() );
194}
195
196inline bool PdfInfo::operator!=( const PdfInfo& a ) const
197{
198 /// any nonmatching member generates inequality
199 return !( a == *this );
200}
201
[572]202inline bool PdfInfo::is_valid() const
203{
204 if( m_id1 != 0 ) return true;
205 if( m_id2 != 0 ) return true;
206 if( m_pdf_id1 != 0 ) return true;
207 if( m_pdf_id2 != 0 ) return true;
208 if( m_x1 != 0 ) return true;
209 if( m_x2 != 0 ) return true;
210 if( m_scalePDF != 0 ) return true;
211 if( m_pdf1 != 0 ) return true;
212 if( m_pdf2 != 0 ) return true;
213 return false;
214}
215
[349]216} // HepMC
217
218#endif // HEPMC_PDF_INFO_H
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