Study of τ → hhh+ντ decays

The BELLE collaboration

Research output: Contribution to journalArticlepeer-review


We present a new study of the τ→hhh+ντ decays at Belle. Previous measurements of the branching fractions of these decays at Belle and BABAR showed significant difference, especially for the τ→KK+Kντ mode. The dominant systematic uncertainty is related to the K/π identification (PID). There are two sources of the PID uncertainty: insufficient accuracy of the experimental misidentification efficiency correction for the low momentum pions from τ decays and impact of the additional γ-s on the identification. To improve the accuracy of the misidentification efficiency correction we utilize KS 0(→π+π) sample. Additional γ-s in the vicinity of the track give notable impact on the PID, hence we apply special γ-veto. The systematic uncertainties are monitored by specially constructed estimator.

Original languageEnglish
Pages (from-to)221-223
Number of pages3
JournalNuclear and Particle Physics Proceedings
Publication statusPublished - 1 Jun 2017


  • K/π identification
  • tau decays
  • K/pi identification

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