TauSpinner to evaluate CP effects in Higgs decays at LHC 

Tomasz Pzedzinski, Elzbieta Richter-Was, Zbigniew-Was

1) For physics documentation see our paper:
   TauSpinner: a tool for simulating CP effects in $ H \to \tau \tau$ decays at LHC
   Hep/ph ....
   To execute the demos:
   - Compile Tauola++ with TauSpinner and set up TauSpinner examples.
     For details on how to run the present set of demos see the paper.

2) Initialization of options (defined in CP-test.cxx) for TauSpinner demos of subdirs:

   // Next 3 lines are  used to initialize TauSpinner
   // CMSENE should be changed, Ipp should not be changed,
   // examples are set to work with unpolarized sammples only, Ipol is not
   // functioning yet.
   double CMSENE = 14000.; // center of mass system energy used in PDF calculation
   bool   Ipp    = true;   // for pp collisions
   int    Ipol   = 1;      // are input samples polarized?

   // Initialize TauSpinner (flags nonSM and nonSMN are 0 for these tests)
   initialize_spinner(Ipp, Ipol, 0, 0, CMSENE);

   // Next line is used to initialize transverse spin effects in calculation of TauSpinner weight 
   // for  H-rho, H-pi tests:
   setHiggsParametersTR(-1.0, 1.0, 0.0, 0.0); // for scalar H
   //setHiggsParametersTR( 1.0,-1.0, 0.0, 0.0); // for pseudo-scalar H
   //double theta=0.2;
   //setHiggsParametersTR(-cos(2*theta),cos(2*theta) ,-sin(2*theta),-sin(2*theta));
   // for mixed parity case

   // Next line is used  to initialize transverse spin effects in calculation of TauSpinner weight 
   // by  CP-test-Z-pi, CP-test-Z-rho
   // Multipliers for  components of transverse density matrix of DY
   //                  (Rxx,Ryy,Rxy,Ryx)
   setZgamMultipliersTR(1., 1., 1., 1. );

   // NOTE: for Z decays, table1-1.txt and table2-2.txt must be present in directory
   //       from which the program is executed. Important for  CP-test-Z-pi, CP-test-Z-rho.
   //       Otherwise transverse spin effects will be absent.

3) to execute:
   make clean
   make
   cd Z(H)-pi(rho)
   ../CP-test.exe events.dat
   finally to compare results:
   ../compare.sh  scalar.root pseudoscalar.root  (or any other previously 
                                                  obtained/archived resuls)

