This is a short message on non-fully verified necessary to run tauola 
universal interface in cases when some object fragments into final state 
of more than two leptons of the third family. It affects part of the code
which operat on often overloaded HEPEVT so further verifications are needed.
Because of the nature ov HEPEVT these days it can not be done in 
a systematic way; need time. On the other hand it seem to be natural and 
obvious. 

This patch does not fix the question of spin state of tau in such 
a generalized case For the case of decay chains involving staus neutralinos 
etc. attention (dfollowing basic rules) is needed. 
It must be done case by case.

This patch is thanks to such a work performed with Philip Bechtle and Peter Schade.

April-June 2008

this is the piece of code which to change in
tauola/demo-jetset/tauface-jetset

It belongs to the routine PHYFIX and is located between line 240 and 270.


C(BPK)-->
          DO I=MAX(NP1+1,ISON(1)),ISON(2)
C(BPK)--<
C(ZW PS)-->
             IF(IDHEP(I).EQ.-KFTAU.OR.IDHEP(I).EQ.-KFNUE) THEN
              NP1=I
              GOTO 111
             ENDIF
          ENDDO
  111     continue
C(ZW PS)--<
C(BPK)-->
          DO I=MAX(NP2+1,ISON(1)),ISON(2)
C(BPK)--<
C(ZW PS)-->
             IF(IDHEP(I).EQ. KFTAU.OR.IDHEP(I).EQ. KFNUE) then
              NP2=I
              goto 112
             endif
          ENDDO
  112     continue
C(ZW PS)--<
          DO I=1,4
             P1(I)= PHEP(I,NP1)    !momentum of tau+
             P2(I)= PHEP(I,NP2)    !momentum of tau-
             Q1(I)= P1(I)+P2(I)
          ENDDO