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[u/mrichter/AliRoot.git] / PYTHIA / jetset / lutaud.F

 
C********************************************************************* 
 
      SUBROUTINE LUTAUD(ITAU,IORIG,KFORIG,NDECAY) 
 
C...Dummy routine, to be replaced by user, to handle the decay of a 
C...polarized tau lepton. 
C...Input: 
C...ITAU is the position where the decaying tau is stored in /LUJETS/. 
C...IORIG is the position where the mother of the tau is stored; 
C...     is 0 when the mother is not stored. 
C...KFORIG is the flavour of the mother of the tau; 
C...     is 0 when the mother is not known. 
C...Note that IORIG=0 does not necessarily imply KFORIG=0; 
C...     e.g. in B hadron semileptonic decays the W  propagator 
C...     is not explicitly stored but the W code is still unambiguous. 
C...Output: 
C...NDECAY is the number of decay products in the current tau decay. 
C...These decay products should be added to the /LUJETS/ common block, 
C...in positions N+1 through N+NDECAY. For each product I you must 
C...give the flavour codes K(I,2) and the five-momenta P(I,1), P(I,2), 
C...P(I,3), P(I,4) and P(I,5). The rest will be stored automatically. 
 
      COMMON/LUJETS/N,K(4000,5),P(4000,5),V(4000,5) 
      COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) 
      SAVE /LUJETS/,/LUDAT1/ 
 
C...Stop program if this routine is ever called. 
C...You should not copy these lines to your own routine. 
      NDECAY=ITAU+IORIG+KFORIG      
      WRITE(MSTU(11),5000) 
      IF(RLU(0).LT.10.) STOP 
 
C...Format for error printout. 
 5000 FORMAT(1X,'Error: you did not link your LUTAUD routine ', 
     &'correctly.'/1X,'Dummy routine in JETSET file called instead.'/ 
     &1X,'Execution stopped!') 
 
 
      RETURN 
      END