International Conference on Precision Physics and Fundamental Physical Constants (FFK-2015)

Session

Spectroscopy-2.

12 Oct 2015, 16:30

Kis terem (Small conference room) (Hungarian Academy of Sciences)

Conveners

Spectroscopy-2.

• Vladimir Korobov

3. Precision measurement of the hyperfine splitting of positronium

Akira Ishida (University of Tokyo (JP))

12/10/2015, 16:30

Positronium (Ps) is an ideal system for precision test of bound-state Quantum Electrodynamics (QED). The hyperfine splitting (HFS) of the ground-state Ps has a discrepancy of 16 ppm (4.5 $\sigma$) between the averaged previous experimental value and the theoretical calculation with $O(\alpha^3)$ corrections. A new experiment which reduced possible systematic uncertainties, which are Ps...

14. High precision spectroscopy of Ps

David Cooke (Eth Zurich)

12/10/2015, 17:15

Positronium is an excellent test-bed for bound-state QED, owing to its purely leptonic nature. This allows its properties to be calculated very precisely in terms of the fine structure constant, with no contributions from hadronic interactions (weak interactions can also be neglected at the present experimental level). A measurement of the 1S-2S transition frequency of poitronium (at a...

6. Nanoplasmonics for ultimate spatiotemporal characterization of optical near-fields

Dr Péter Dombi (Wigner Research Centre for Physics)

12/10/2015, 17:45

Nano-optical near fields already play a fundamental role in many nanotechnology applications including photovoltaics, sensorics and biomedicine. The characterization of nanoscale changes of the electromagnetic field on ultrashort (femto- and attosecond) time-scales is a core requirement for developing applications. I will show how ultrafast photoemission from and photoelectron spectroscopy on...

18. Shifts and widths of magnetic Feshbach resonances in atomic traps

Prof. Vladimir Melezhik (JINR)

12/10/2015, 18:15

We have developed and analyzed in application to experimentally interesting cases a theoretical approach to study magnetic Feshbach resonances in atomic traps [1,2]. The program was realized by extending (to confined geometry of the traps) the two-channel model of Lange et al [3] suggested for parametrization of resonances in free-space. In our approach, the experimentally known parameters...