scholarly journals Study of the Lorentz Structure of the Charged Weak Interaction in Tau Decays at Belle

2018 ◽  
Vol 46 ◽  
pp. 1860060
Author(s):  
Junya Sasaki
Keyword(s):  
Weak Interaction ◽  
Tau Lepton ◽  
Tau Decays ◽  
Preliminary Results ◽  
Lorentz Structure ◽  
Leptonic Decays ◽  
Decay Widths ◽  
Belle Experiment ◽  
Michel Parameters

To test the Lorentz structure of the charged weak interaction, we study leptonic decays of tau lepton in the Belle experiment. We perform this test through the measurement of Michel parameters which appear in the differential decay widths of leptonic tau decays. In this paper, we discuss the preliminary results of the measurement of Michel parameters at Belle.

scholarly journals Leptonic decays of the tau lepton

2019 ◽  
Vol 212 ◽  
pp. 08004 ◽  
Author(s):  
Matteo Fael
Keyword(s):  
Standard Model ◽  
Weak Interaction ◽  
Tau Lepton ◽  
Decay Modes ◽  
Leptonic Decays ◽  
The Standard Model

In these proceedings we review the SM prediction for the tau leptonic decays, including the radiative $ (\tau \to \ell \lambda \nu \bar \nu ) $ and the five-body $ (\tau \to \ell \ell '\ell '\nu \bar \nu ) $ decay modes, which are among the most powerful tools to study precisely the structure of the weak interaction and to constrain possible contributions beyond the V–A coupling of the Standard Model.

scholarly journals On spin asymmetry in muon and tau decays

2018 ◽  
Vol 33 (32) ◽  
pp. 1850191
Author(s):  
A. B. Arbuzov ◽  
T. V. Kopylova ◽  
I. K. Sklyarov
Keyword(s):  
Charged Lepton ◽  
Spin Asymmetry ◽  
Second Order ◽  
Tau Leptons ◽  
Mass Ratio ◽  
Fermi Model ◽  
Tau Decays ◽  
Standard Formula ◽  
Leading Logarithm ◽  
Michel Parameters

The angular asymmetry in decays of polarized muons and tau leptons is discussed. Both the standard [Formula: see text] Fermi model and the general parametrization via Michel parameters are considered. Numerical importance of contributions suppressed by charged lepton mass ratio is underlined. Contribution of the second order QED correction is estimated in the leading logarithm approximation.

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.

scholarly journals Measurement of the Energy Spectrum ofνefrom Muon Decay and Implications for the Lorentz Structure of the Weak Interaction

1998 ◽  
Vol 81 (3) ◽  
pp. 520-523 ◽  
Author(s):  
B. Armbruster ◽  
I. M. Blair ◽  
B. A. Bodmann ◽  
N. E. Booth ◽  
G. Drexlin ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
Weak Interaction ◽  
Muon Decay ◽  
Lorentz Structure

scholarly journals A study of the Lorentz structure in tau decays

2000 ◽  
Vol 16 (2) ◽  
pp. 229-252 ◽  
Author(s):  
P. Abreu et al. ◽  
Keyword(s):  
Tau Decays ◽  
Lorentz Structure

scholarly journals Latest Belle results on Tau decays

2019 ◽  
Author(s):  
Yifan Jin ◽  
Denis Epifanov ◽  
Hiroaki Aihara
Keyword(s):  
Confidence Level ◽  
Branching Fraction ◽  
Data Set ◽  
Tau Decays ◽  
Preliminary Results ◽  
Upper Limit

We present preliminary results of a latest measurement at Belle, the branching fraction of rare tau decay, \tau^- \rightarrow \pi^- \nu_{\tau} \ell^+ \ell^-τ−→π−ντℓ+ℓ− (\ell = eℓ=e or \muμ), using a 562 \rm fb^{-1} data set. The branching fraction of \tau^- \rightarrow \pi^- e^+ e^- \nu_\tauτ−→π−e+e−ντ is measured to be \mathbf{ \mathcal{B}(\tau^-\rightarrow \pi^- e^+ e^- \nu_\tau) = (2.11 \pm 0.19 \pm 0.30) \times 10^{-5}}ℬ(𝛕−→𝛑−𝐞+𝐞−𝛎𝛕)=(2.11±0.19±0.30)×10−5, where the first uncertainty is statistical and the second is systematic. An upper limit is set on the branching fraction of \tau^- \rightarrow \pi^- \mu^+ \mu^- \nu_\tauτ−→π−μ+μ−ντ, \mathbf{\mathcal{B}(\tau^-\rightarrow \pi^- \mu^+ \mu^- \nu_\tau) < 1.06 \times 10^{-5}}ℬ(𝛕−→𝛑−𝛍+𝛍−𝛎𝛕)<1.06×10−5, at 90% confidence level.

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