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Opened 13 years ago

Closed 13 years ago

#185 closed defect (invalid)

Take photon radiation channels into account for leptonic tau BRs

Reported by: Frank Siegert Owned by: Frank Siegert
Priority: major Milestone: rel-1.4.0
Component: Unknown Version: 1.3.0
Keywords: Cc:

Description

The tau BRs into electron and muon should include the decay + gamma BRs, as those are generated by PHOTONS. 

decay      PDG2010 FIT    [PDG2010 AVER.]   (BR for decay + gamma)  numbers in
----------------------------------------------------------------------------------
tau -> mu  17.39 \pm 0.04  [17.33 \pm 0.05]  (+gamma: 0.36 )             [%]
tau -> el  17.82 \pm 0.04  [17.82 \pm 0.05]  (+gamma: 1.75 )             [%]

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comment:1 Changed 13 years ago by marek

Resolution: → invalid
Status: new → closed

If I am not mistaken, the numbers quoted by the PDG for the tau -> e/mu decays are inclusive, i.e. including the radiative decay modes. Also, otherwise, lepton universality would be broken. Given these numbers the fraction of radiative decay modes is then correctly calculated by Photons, see eg. the Photons paper arXiv:0810.5071.

Marek

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