PSAS'2024 - International Conference on Precision Physics of Simple Atomic Systems

Session

Session 8

13 Jun 2024, 14:15

ETH Zurich- Hönggerberg Campus

Conveners

Session 8

• Paolo Crivelli (ETH Zurich (CH))

Session 8

• Paolo Crivelli (ETH Zurich (CH))

62. Measurement of the C-forbidden 2 $^3$S$_1$ $\rightarrow$ 2 $^1$P$_1$ transition in positronium

Rebecca J Daly (University College London)

13/06/2024, 14:15

Talk

We report the results of a new measurement of the $2~^3 \mathrm{S}_1 \rightarrow 2~^1\mathrm{P}_1$ transition ($\nu_\mathrm{F}$) in positronium (Ps). This transition, which is strictly forbidden by charge conjugation symmetry (C), can be observed in a magnetic field. Using a pulsed Ps beam we optically generate radiatively metastable $2~^3\mathrm{S}_1$ atoms, and then drive them to the...

81. One-dimensional chirp cooling of positronium

Dr Kenji Shu (The University of Tokyo)

13/06/2024, 14:40

Talk

Positronium (Ps), an electron-positron bound system, is pivotal for testing fundamental physics through Quantum Electrodynamics (QED), the most precise theory in physics. To apply extremely accurate transition frequency measurements to Ps with laser precision spectroscopy and minimize systematic errors, it is important to decelerate the gas of Ps. However, the application of laser cooling to...

92. Laser Cooling of Positronium

Benjamin Rienacker (University of Liverpool (GB))

13/06/2024, 15:05

Talk

Positronium (Ps), the short-lived bound state of an electron and a positron, exists for only 142 ns in its parallel-spin ground-state configuration (ortho-Ps). It serves as a crucial testing ground for bound-state Quantum Electrodynamics (QED) and for investigating potential violations of the Weak Equivalence Principle for leptons. Existing experiments and proposed schemes have been limited by...

43. Progress in the calculation of order $\alpha^7$ radiative-recoil corrections to the energy levels of muonium and positronium

Gregory Adkins

13/06/2024, 16:00

Talk

Muonium and positronium, the $e^-\mu^+$ and $e^-e^+$ bound systems, are described almost completely within quantum electrodynamics. Their energy levels can be calculated to high precision, and these systems are also subject to high precision measurements. Recent developments include intense experimental work on muonium by the MuSEUM collaboration at J-PARC, the MuMASS collaboration at PSI,...

60. LEMING - Cold muonium for atomic physics and gravity

Anna Soter (ETH Zürich)

13/06/2024, 16:30

Talk

In the LEMING experiment we aspire to carry out next generation laser spectroscopy and gravity experiments using a novel cold atomic beam of muonium (Mu = μ⁺ + e⁻). The result of a Mu free fall measurement would reveal a clean coupling of gravity to elementary (anti)leptons from the second generation, complementary to all existing probes - normal atoms and recently antihydrogen - where...

58. Rydberg atom interferometry for testing the Weak Equivalence Principle with antimatter

Louise McCaul

13/06/2024, 16:55

Talk

Atom interferometry involving cold ground-state atoms is well established for precisely measuring acceleration due to gravity, $g$, and testing the Weak Equivalence Principle (WEP) [1]. However, because of the short (142 ns) ground-state annihilation lifetime of positronium, to exploit analogous techniques to test antimatter gravity, to complement the 'free-fall' experiments with antihydrogen...