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da0e9ce3 | 1 | //-------------------------------------------------------------------------- |
2 | // | |
3 | // Environment: | |
4 | // This software is part of the EvtGen package developed jointly | |
5 | // for the BaBar and CLEO collaborations. If you use all or part | |
6 | // of it, please give an appropriate acknowledgement. | |
7 | // | |
8 | // Copyright Information: See EvtGen/COPYRIGHT | |
9 | // Copyright (C) 1998 Caltech, UCSB | |
10 | // | |
11 | // Module: EvtGen/EvtPhotonParticle.hh | |
12 | // | |
13 | // Description:Class to describe photons | |
14 | // | |
15 | // Modification history: | |
16 | // | |
17 | // DJL/RYD Sept. 25, 1996 Module created | |
18 | // | |
19 | //------------------------------------------------------------------------ | |
20 | ||
21 | #ifndef EVTPHOTONPARTICLE_HH | |
22 | #define EVTPHOTONPARTICLE_HH | |
23 | ||
24 | #include "EvtGenBase/EvtVector4C.hh" | |
25 | #include "EvtGenBase/EvtParticle.hh" | |
26 | class EvtId; | |
27 | ||
28 | //Class to handle massless spin 1 particles. | |
29 | ||
30 | class EvtPhotonParticle: public EvtParticle { | |
31 | ||
32 | public: | |
33 | ||
34 | EvtPhotonParticle(){} | |
35 | virtual ~EvtPhotonParticle(); | |
36 | ||
37 | void init(EvtId part_n,double e,double px,double py,double pz); | |
38 | void init(EvtId part_n,const EvtVector4R& p4); | |
39 | ||
40 | //Return polarization vectors | |
41 | EvtVector4C epsParentPhoton(int i); | |
42 | EvtVector4C epsPhoton(int i); | |
43 | ||
44 | ||
45 | EvtSpinDensity rotateToHelicityBasis() const; | |
46 | EvtSpinDensity rotateToHelicityBasis(double alpha, | |
47 | double beta, | |
48 | double gamma) const; | |
49 | ||
50 | private: | |
51 | ||
52 | EvtVector4C eps1,eps2; | |
53 | int _evalBasis; | |
54 | ||
55 | EvtPhotonParticle(const EvtPhotonParticle& photon); | |
56 | EvtPhotonParticle& operator=(const EvtPhotonParticle& photon); | |
57 | ||
58 | }; | |
59 | ||
60 | #endif | |
61 |