1 //--------------------------------------------------------------------------
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.
8 // Copyright Information: See EvtGen/COPYRIGHT
9 // Copyright (C) 1998 Caltech, UCSB
11 // Module: EvtGen/EvtVVpipiMoxhay.hh
13 // Description: This model is based on the proposal by Tuan and Lipkin
14 // (Phys.Lett.B206:349-353,1988) and the subsequent model
15 // by Moxhay (Phys.Rev.D39:3497,1989) for the dipion spectrum
16 // in Y(3S) -> pi+ pi- Y(1S). Please Note: in Moxhay's paper,
17 // he wrote the fitted value of the parameter Im(B)/A as
18 // -0.2983. However, using his quoted value leads to the wrong
19 // spectrum. Changing the sign of his quoted Im(B)/A fixes the
20 // shape and reproduces his result. Therefore, please pass
21 // Im(B)/A = 0.2983 and Re(B)/A = 0.2196 to get the correct shape
22 // based on his fit to the CLEO data.
27 // 1.0000 Upsilon pi+ pi- Y3STOY1SPIPIMOXHAY 0.2196 0.2983;
30 // --> the order of parameters is: Re(B)/A Im(B)/A
33 // Modification history:
35 // SEKULA November 02, 2007 Module created
37 //------------------------------------------------------------------------
39 #ifndef EVTY3STOY1SPIPIMOXHAY_HH
40 #define EVTY3STOY1SPIPIMOXHAY_HH
42 #include "EvtGenBase/EvtDecayProb.hh"
46 class EvtY3SToY1SpipiMoxhay:public EvtDecayProb {
50 EvtY3SToY1SpipiMoxhay() {}
51 virtual ~EvtY3SToY1SpipiMoxhay();
53 std::string getName();
54 EvtDecayBase* clone();
56 void decay(EvtParticle *p);