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Abstract
The τ lepton is the heaviest of the charged leptons and the only one to decay into hadrons. This provides a unique opportunity to probe low energy QCD and the charged weak interaction of both the relative coupling strength to the first and second generation of quarks and to the lepton. Moreover, many new physics scenarios couple primarily to the third generation, making it a promising prospect for new physics searches. In this paper, an overview of recent measurements of the τ lepton from BABAR , BELLE and BES are presented.
Highlights
The τ lepton is the heaviest of the charged leptons and the only one to decay into hadrons
With the large datasets collected by the BELLE and BABAR experiments there is a unique opportunity to probe the Standard Model by using the rich dynamics of τ decays to an unprecedented precision
From the B-Factories, there have been many measurements of branching fractions/ratios from τ decay modes, as well as numerous searches for new decay modes [1]. This includes the majority of the main strange τ branching fractions and upper limits on the unmeasured strange decay modes[2, 3]
Summary
Lepton Flavour Violation (LFV) is forbidden in the Standard Model of Particle Physics and is strongly suppressed when neutrino oscillations are taken into account. There are many new physics scenarios that predict LFV could occur at the O(10−8) level[17,18,19,20,21,22,23,24]. Any observation of LFV would be a clear signature of new physics. LFV was intensively searched for at the BABAR and BELLE experiments[1]. In addition to LFV, these searches include Lepton Number Violation and Baryon Number Violation. With the expected luminosity at the BELLE II Experiment, LFV searches promise to be an exciting topic for τ physics
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