# Review of Rare and Forbidden $\\tau$ Decays

Source: [Review of Rare and Forbidden $\\tau$ Decays](<https://www.sota2.com/research/paper/68fa24742c2a3760193a467a>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-27T02:57:37.755Z

Authors: K.K. Gan

Published: 1997-07-02T20:39:21.000Z

## Abstract

This is a review of rare and forbidden decays of the $\\tau$ lepton. For the rare decays, this includes new results on the chiral anomaly decay $\\taupietapio$, new upper limits on the second-class-current decay $\\taupieta$, and the observations of the Cabibbo-suppressed decay $\\tauketa$ and the internal conversion decay $\\taueee$. For the forbidden decays, there are new upper limits on the radiative decays $\\tauegamma$ and $\\taumugamma$. Some forbidden decays which have not been previously searched for are also suggested.

## Recorded benchmark results

A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage.

## Original sources and implementation

[Original paper](<https://arxiv.org/abs/hep-ex/9707007>)

[PDF](<https://arxiv.org/pdf/hep-ex/9707007.pdf>)