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RelativisticBW.cc
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3 #include <assert.h>
4 #include <cmath>
5 
6 #if (defined __STRICT_ANSI__) || (defined _WIN32)
7 #ifndef M_PI
8 #define M_PI 3.14159265358979323846
9 #endif // M_PI
10 #endif // __STRICT_ANSI__
11 
12 using namespace std;
13 
14 namespace Genfun {
15 FUNCTION_OBJECT_IMP(RelativisticBWDistribution)
16 
17 
19  _mass("mass", 50, 10, 90),
20  _width ("width", 5, 0, 100)
21 {}
22 
23  RelativisticBWDistribution::RelativisticBWDistribution(const RelativisticBWDistribution & right):
24  AbsFunction(),
25  _mass(right._mass),
26  _width (right._width)
27 {
28 }
29 
31 }
32 
34  double M=_mass.getValue();
35  double G=_width.getValue();
36  double g=sqrt(M*M*(M*M+G*G));
37  double k = 2.0*sqrt(2.0)*M*G*g/M_PI/sqrt(M*M+g);
38  double f = k/((x-M)*(x-M)*(x+M)*(x+M)+M*M*G*G);
39  return f;
40 
41 }
42 
44  return _mass;
45 }
46 
47 
49  return _width;
50 }
51 
52 
53 } // namespace Genfun