Conveners
Session 3: Exclusive and inclusive hadronic tau decays
- Sergi Gonzalez-Solis (Indiana University)
Session 3: Exclusive and inclusive hadronic tau decays
- Marc Knecht (CNRS)
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Pablo Roig Garcés (Cinvestav, Mexico)29/09/2021, 08:00Tau2021 AbstractsOral contribution
After a brief review of semileptonic tau decays in the Standard Model, I will discuss the usefulness of these channels in several new physics searches.
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Gabriel Lopez Castro (Cinvestav, Mexico)29/09/2021, 08:25Tau2021 AbstractsOral contribution
The calculation of radiative corrections (radcorr) in semileptonic decays requires a good description of photon-hadron interactions at all energies. We present a calculation of the radcorr to $\tau^- \to P^- \nu_{\tau}$ decays ($P$ a pseudoscalar meson) where photon-hadron form factors obeys the expected QCD constraints at very small and very large virtual photon momenta. The implications for...
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Zhi-Hui Guo (Southeast University)29/09/2021, 08:45Tau2021 AbstractsOral contribution
The radiative two-pion tau decay process is studied in this work. The resonance chiral theory is used to calculate the relevant form factors. Different light-flavor vector resonance dynamics are revealed in several different two-particle invariant mass distributions. Interesting studies on the T-odd asymmetry distributions arising from the radiative two-pion tau decay process are explored as...
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Bachir Moussallam (Universite Paris-Saclay)29/09/2021, 09:05Tau2021 AbstractsOral contribution
The rare second-class decay mode of the $\tau$ into $\eta\pi\nu$ could be
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observed for the first time at Belle II. It is important to try to derive
a reliable evaluation of the branching fraction and of the energy
distribution of this mode within the standard-model. Many predictions
exist already in the literature which, unfortunately, can differ by one to
two orders of magnitude. In... -
Frederic Noël (Universität Bern)29/09/2021, 09:25Tau2021 AbstractsOral contribution
Pion-kaon ($\pi K$) pairs occur frequently as final states in heavy-particle decays.
A consistent treatment of $\pi K$ scattering and production amplitudes over a wide energy range is therefore mandatory for multiple applications:
in Standard Model tests; to describe crossed channels in the quest for exotic hadronic states; and for an improved spectroscopy of excited kaon resonances.In...
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Alberto Lusiani (Scuola Normale Superiore and INFN, sezione di Pisa)29/09/2021, 09:45Tau2021 AbstractsOral contribution
We present updated determinations of |Vus| using tau decays that include a preliminary updated HFLAV global fit of the tau branching fractions, up-to-date lattice hadronic form factors and decay constants, and novel determinations published in 2019 of the electromagnetic and strong isospin-breaking corrections to the π+→μ+ν[γ] and K+→μ+ν[γ] leptonic decay rates obtained with lattice QCD+QED.
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Dr Fabian Krinner (Max Planck Institute for Physics, Munich)29/09/2021, 10:20Tau2021 AbstractsOral contribution
In the framework of precision experiments, the search for electric dipole moments and the precise determination of magnetic dipole moments (g-2)
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have since long be of prime interest. Tau leptons play a particular role owing to the large mass as compared to the electron and muon.
The precision of these measurements is, at the one hand, dominated by radiative corrections, which govern the... -
Mikhail Mikhasenko (University of Bonn (DE))29/09/2021, 10:40Tau2021 AbstractsOral contribution
Hadronic decays of $\tau$ lepton provide a unique possibility to study dynamics in a three-body hadronic system. Particularly, $\tau^-\to \pi^+\pi^-\pi^-\,\nu$ and $\tau^-\to K^-K^+\pi^-\,\nu$ gives a clear sample of the $a_1(1260)$ decays. While the pionic system is dominated by the $\rho$ intermediate resonance and the system with kaons shows mostly $K^*$ resonances, the two final states are...
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Andre Hoang (University of Vienna)29/09/2021, 11:00Tau2021 AbstractsOral contribution
The discrepancy between the FOPT and CIPT predictions for the hadronic tau decay rate (and other spectral function moments) has been a subject of intense investigations for many years and constitutes a major theoretical uncertainty for strong coupling determinations from hadronic tau decay spectral data. We demonstrate that the discrepancy may be understood since the Borel representations...
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Diogo Boito (Universidade de São Paulo)29/09/2021, 11:20Tau2021 AbstractsOral contribution
We use a new, more precise, non-strange, inclusive vector
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isovector spectral function to determine the strong coupling at the
tau mass scale employing finite energy sum rules. The new spectral
function is obtained from a combination of (i) ALEPH and OPAL results
for the 2 pion and 4 pion tau decay channels, (ii) recent BaBar
results for the tau K Kbar decay distribution, and... -
Maarten Golterman (San Francisco State University)29/09/2021, 11:40Tau2021 AbstractsOral contribution
Tau-based finite-energy sum rule (FESR) analyses often assume that scales
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s_0~m_tau^2 are large enough that (i) integrated duality violations (DVs)
can be neglected, and (ii) contributions from non-perturbative OPE
condensates of dimension D scale as ~(Lambda_{QCD}/m_tau )^D, allowing the
OPE series to be truncated at low dimension. The latter assumption is not
true in general since the... -
Emilie PassemarTau2021 AbstractsOral contribution
Test 2
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Sergi Gonzalez-Solis (IFAE-UAB)Tau2021 AbstractsOral contribution
This is a test from Sergi
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