|
Calendar of Physics Talks Vienna
| Vienna Theory Lunch Club - What can the dispersive methods tell us about the $\pi\pi$ scattering? |
| Speaker: | Martin Zdrahal (Uni Wien) |
| Abstract: | Pions are the simplest particles interacting by the strong
interaction. The pion-pion scattering is therefore the simplest
nontrivial hadron scattering process and thereby an important source
of information about the strong interactions. In particular it is very
sensitive to the mechanism of spontaneous chiral symmetry breaking.
The most important characteristic of it is given by the scattering
lengths.
The chiral perturbation theory is a natural tool for describing this
process and gives a prediction of the scattering lengths.
The dispersive methods based on requirements on the analytic form of
the amplitudes together with the validity of unitarity relations
showed themselves to be useful in two ways: combined with the chiral
perturbation theory they give a more accurate theoretical prediction
for the scattering lengths; and using them alone as a
model-independent way based only on the very general principles of the
quantum field theories they give some general restrictions of the
numerical values of the lengths and can also give methods how to
obtain experimentally these values from different processes.
We will concentrate mainly on the second aspect and show the method
enabling us to get them from the appearance of the so-called cusp in
$K \to 3\pi$ decay.
Overview Lunch Club |
| Date: | Tue, 19.05.2009 |
| Time: | 12:30 |
| Duration: | 60 min |
| Location: | University of Vienna, Boltzmanngasse 5, 5th Floor, Large Seminar Room |
| Contact: | Max Attems, Daniel Grumiller, Beatrix Hiesmayr |
| Recent progress in hadronic tau decays |
| Speaker: | Matthias Jamin (Univ. Autonoma de Barcelona) (Fakultät für Physik) |
| Abstract: | im Rahmen des Teilchenphysikseminars |
| Date: | Tue, 19.05.2009 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | H. Neufeld |
| Neutron Interferometry and Berry Phase |
| Speaker: | Dr. Katharina Durstberger-Rennhofer (Atominstitut Wien) (Fakultät für Physik) |
| Abstract: | Seminar |
| Date: | Wed, 20.05.2009 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Kleiner Seminarraum, Boltzmanngasse 5, 5. Stock |
| Contact: | Reinhold A. Bertlmann |
|