Measurement of the Michel Parameter $${\xi^{\prime}}$$ in Tau-Lepton Decays at the Super Charm-Tau Factory

2021 ◽  
Vol 84 (2) ◽  
pp. 212-215
Author(s):  
D. A. Bodrov
Keyword(s):  
Tau Lepton ◽  
Lepton Decays ◽  
Michel Parameter

scholarly journals Non-standard interactions in $\tau^- \to (\pi^-\eta,\pi^-\pi^0)\nu_{\tau}$ decays

2019 ◽  
Author(s):  
Gabriel Lopez Castro
Keyword(s):  
Weak Interactions ◽  
High Energy ◽  
New Physics ◽  
Tau Lepton ◽  
Tau Decays ◽  
Set Constraints ◽  
Belle Ii ◽  
Lepton Decays ◽  
Energy Processes ◽  
New Interactions

Originally thought as clean processes to study the hadronization of the weak currents, semileptonic tau lepton decays can be useful to set constraints on non-standard (NS) weak interactions. We study the effects of new interactions in \tau^- \to (\pi^-\eta,\pi^-\pi^0)\nu_{\tau}τ−→(π−η,π−π0)ντ decays and find that they are sensitive probes of these New Physics effects in the form of scalar and tensor interactions, respectively. Further improved measurements at Belle II will set limits on these scalar interactions that are similar to other low and high energy processes.

TAU LEPTON HADRONIC DECAYS AT BABAR AND BELLE

2013 ◽  
Vol 28 (24) ◽  
pp. 1360007
Author(s):  
G. D. LAFFERTY
Keyword(s):  
Quark Mass ◽  
Branching Fractions ◽  
Mass Difference ◽  
Total Sample ◽  
Tau Lepton ◽  
Hadronic Decays ◽  
Decay Modes ◽  
Systematic Uncertainties ◽  
Lepton Decays ◽  
Lower Limits

The BaBar and Belle experiments together recorded a total sample of some 3 ×109 tau lepton decays between the years 2000 and 2010. This enabled many new and improved measurements of tau hadronic decays to be made, and resulted in lower limits for branching fractions to rare and forbidden hadronic modes, such as those mediated by second-class weak currents which are sensitive to the u–d quark mass difference. Better measurements of strange decays have contributed to more precise data on the CKM matrix element, |Vus|. However, only limited progress has been made in measurements that feed into knowledge of the value of the strong coupling constant, αs, and the strange quark mass. This is largely due to the dominance of systematic uncertainties on branching fractions and shapes of mass spectra (spectral functions) for some of the important hadronic tau decay modes.

scholarly journals CPviolation in semileptonic tau lepton decays

2005 ◽  
Vol 72 (3) ◽  
Author(s):  
D. Delepine ◽  
G. López Castro ◽  
L.-T. López Lozano
Keyword(s):  
Tau Lepton ◽  
Lepton Decays
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