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Next: The LUHADR Hadronization Module Up: Stand-Alone TAUOLA Previous: Example

Important Notice

Tau decay branching ratios are initialized in INITDK which is called in TAUINT. The default INITDK in the standard TAUOLA distribution assumes equal branching to all the implemented decay modes. The branching ratios has thus to be adjusted by users according to PDG data or to the results from high statistics TAUOLA runs: the TAUOLA run summary contains the estimated branching ratio to each of the implemented decay modes. The INITDK routine in the current stand-alone version has a reasonably accurate branching ratios for major decay modes but as for rare decay modes the accuracies are questionable. If such rare decay modes are important to your application, you have to rewrite the INITDK routine accordingly.

The currently used branching ratios are summarized the table below where you can identify the decay mode corresponding to each JAK values.

  JAK		Decay Mode		BR/BR(1)
 -------------------------------------------------
    1    TAU-  --> ELECTRON             1.0000
    2    TAU-  --> MUON                 0.9696
    3    TAU-  --> PION	                0.6058
    4    TAU-  --> RHO (->2PI)          1.3274
    5    TAU-  --> A1  (->3PI)          0.7194
    6    TAU-  --> KAON                 0.0398
    7    TAU-  --> K*                   0.0702
    8    TAU-  --> 2PI-,  PI0,  PI+     0.0840 
    9    TAU-  --> 3PI0,        PI-     0.0172
   10    TAU-  --> 2PI-,  PI+, 2PI0     0.0634
   11    TAU-  --> 3PI-, 2PI+,          0.0289
   12    TAU-  --> 3PI-, 2PI+,  PI0     0.0042
   13    TAU-  --> 2PI-,  PI+, 3PI0     0.0042
   14    TAU-  -->  K-, PI-,  K+        0.0061
   15    TAU-  -->  K0, PI-, K0B        0.0056
   16    TAU-  -->  K-,  K0, PI0        0.0005
   17    TAU-  --> PI0, PI0,  K-        0.0061
   18    TAU-  -->  K-, PI-, PI+        0.0315
   19    TAU-  --> PI-, K0B, PI0        0.0319
   20    TAU-  --> ETA, PI-, PI0        0.0109
   21    TAU-  --> PI-, PI0, GAM        0.0032
   22    TAU-  -->  K-,  K0             0.0181
 -------------------------------------------------



Keisuke Fujii
12/3/1998