Searching for New Physics at the Quantum Technology Frontier

Session

Atoms and Exotic Atoms I

3 Jul 2023, 08:30

Congressi Stefano Franscini (CSF), Ascona (Ticino), Switzerland

Conveners

Atoms and Exotic Atoms I

• Paolo Crivelli (ETH Zurich (CH))

Description

The field of cold atoms and ions is in continuous expansion with a growing number of applications in many different fields. By looking for deviations between accurate theoretical calculations with the experimental results allow to use cold atoms and ions to probe new physics in different ways, including searches for dark sectors and millicharged particles. The recent advances in manipulation and trapping techniques will allow us to push the limits of precision measurements with these systems even further and thus explore uncharted territories for new physics.

100. Session's intro

Paolo Crivelli (ETH Zurich (CH))

03/07/2023, 08:30

33. Challenging QED with atomic Hydrogen

Prof. Thomas Udem

03/07/2023, 08:35

Talk

Precise determination of transition frequencies of simple atomic systems are required for a number of fundamental applications such as tests of quantum electrodynamics (QED), the determination of fundamental constants and nuclear charge radii. The sharpest transition in atomic hydrogen occurs between the metastable 2S state and the 1S ground state with a natural line width of only 1.3 Hz. Its...

85. Precision benchmarks for nuclear and atomic physics from laser spectroscopy of muonic atoms

Aldo Antognini (Paul Scherrer Institute)

03/07/2023, 09:10

Talk

Laser spectroscopy of muonic atoms, hydrogen-like atoms formed by a negative muon and a nucleus, has recently provided the charge radii of the lightest nuclei (proton, deuteron, 3He and 4He) with unprecedented accuracy. In this talk we present laser spectroscopy of these exotic atoms and their contribution to nuclear physics. Emphasis will be given to the new results in 3He.

Moreover we...

52. Precision measurements of $nk$ -- 2s transition frequencies in the hydrogen atom

Simon Scheidegger

03/07/2023, 09:45

Talk

Precision spectroscopic measurements in the hydrogen atom have a long tradition and extensive studies of transitions between states with principal quantum number $n\leq12$ have been carried out [1-6]. These measurements can be used to determine values of the Rydberg constant and the proton charge radius [7]. We present a new experimental approach to perform measurements of transition...

49. Muonic vs. electronic dark forces

Clara Peset (Madrid University)

03/07/2023, 10:40

Talk

Precision atomic spectroscopy provides a solid model independent bound on
the existence of new dark forces among the atomic constituents. We focus on the keV-GeV region investigating the sensitivity to such dark sectors of the recent measurements on muonic atoms at PSI, muonium and positronium. To this end we develop for the first time, the effective field theory that describes the leading...

30. Towards Improving the Precision of the Lamb Shift Measurement in Muonium

Gianluca Janka (PSI & ETH Zurich (CH))

03/07/2023, 11:05

Talk

Due to its lack of internal structure, Muonium is an excellent candidate to provide stringent tests for bound state QED. Furthermore, Muonium is a sensitive probe for the existence of exotic dark-sector particles, new muonic forces, and hidden dimensions. During the Mu-MASS [1] beamtime in December 2019 at the LEM beamline at PSI, we demonstrated the creation of an intense directed beam of...

88. Testing fundamental interactions with the hyperfine splitting in light atomic systems

Prof. Krzysztof Pachucki

03/07/2023, 11:30

Talk

While electrons are point-like particles, atomic nuclei have an intricate internal structure. Modern atomic and molecular calculations typically neglect this nuclear structure and represent the nuclei through the static charge and magnetic-moment distributions. There are, however, a number of important fundamental questions for which we do not have fully satisfactory answers yet: Is the...

96. Introduction to the session

Paolo Crivelli (ETH Zurich (CH))