Line data    Source code

       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/EvtVVpipiMoxhay.hh
      12             : //
      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.
      23             : //
      24             : // Example:
      25             : //
      26             : // Decay  Upsilon(3S)
      27             : //  1.0000    Upsilon  pi+  pi-     Y3STOY1SPIPIMOXHAY 0.2196 0.2983;
      28             : // Enddecay
      29             : //
      30             : //   --> the order of parameters is: Re(B)/A Im(B)/A
      31             : //
      32             : //
      33             : // Modification history:
      34             : //
      35             : //    SEKULA  November 02, 2007         Module created
      36             : //
      37             : //------------------------------------------------------------------------
      38             : 
      39             : #ifndef EVTY3STOY1SPIPIMOXHAY_HH
      40             : #define EVTY3STOY1SPIPIMOXHAY_HH
      41             : 
      42             : #include "EvtGenBase/EvtDecayProb.hh"
      43             : 
      44             : class EvtParticle;
      45             : 
      46             : class EvtY3SToY1SpipiMoxhay:public  EvtDecayProb  {
      47             : 
      48             : public:
      49             : 
      50           0 :   EvtY3SToY1SpipiMoxhay() {}
      51             :   virtual ~EvtY3SToY1SpipiMoxhay();
      52             : 
      53             :   std::string getName();
      54             :   EvtDecayBase* clone();
      55             : 
      56             :   void decay(EvtParticle *p); 
      57             :   void init();
      58             :   void initProbMax();
      59             : 
      60             : };
      61             : 
      62             : #endif
      63             :