Speaker
Dr
Sergi Gonzàlez-Solís
(Department of Physics, Indiana University)
Description
The τ is the only lepton massive enough to decay into hadrons. Its semilep-
tonic decays provide a privileged scenario to study low-energy effects of the strong
interactions under rather clean conditions. Such advantageous framework is used to
improve our understanding of the hadronization of QCD currents, to study meson
form factors and to extract the physical parameters of the intermediate resonances
produced in the decay. In this talk, we will review the status of the hadronic τ decay
modes with particular attention to its decays into two hadrons. By exploiting the
synergy between dispersion relations and Chiral Perturbation Theory we describe
the meson from factors that come up into play. We will also briefly review higher-
multiplicity decay modes. These involve a richer dynamical structure but accounting
for the strong rescattering effects is not an easy task when three or more hadrons
are present. The fantastic possibilities offered by the Belle-II experiment to study
τ physics and low multiplicity final states with high precision make these studies of
timely interest.
Primary author
Dr
Sergi Gonzàlez-Solís
(Department of Physics, Indiana University)
