Forthcoming Events

16.12.2021 - 21.12.2021, Honolulu, Hawaii, USA
01.06.2022 - 30.06.2022, Grindelwald, Switzerland
27.06.2022 - 29.06.2022, University College London, UK


NCCR MUST at Scientifica 2021- Lightning, organic solar cells, and virtual molecules
#NCCRWomen- NCCR MUST celebrates 50 years women’s right to vote in Switzerland
Kick-Off dynaMENT Mentoring for Women in Natural Sciences- with Ursula Keller as plenary speaker
Four new scientific highlights- by MUST PIs Chergui / Milne / Beaud / Staub, by Wolf / Röthlisberger, by Wörner, and Keller
Photon Science Roadmap- for Research Infrastructures 2025-2028 by the Swiss Photon Community
Proof of concept ERC Grant for Ursula Keller Dual-comb laser driven terahertz spectrometer for industrial sensing (DC-THz)
Majed Chergui - elected to the European Academy of Sciences
Ruth Signorell - elected to the European Academy of Sciences
Farewell and Welcome!Chris Milne leaves for the European XFEL, Camila Bacellar takes over
SY-GAIA expedition - measures aerosols in the North-Atlantic

Aldo Antognini

July 2016

Dr. Aldo Antognini (Precision Physics at Low Energy - ETH) was awarded an ERC Consolidator Grant for his project "HyperMu": Hyperfine splittings in muonic atoms and laser technology (PE4).

The proton radius extracted from the measurements of the 2S-2P energy splitting in muonic hydrogen (μp) has attracted great attention because of a 7σ discrepancy with the values extracted from electron scattering and hydrogen (H) spectroscopy. Hundreds of publications have been devoted to the so called “proton radius puzzle” ranging from studies of physics beyond the standard model, to reanalysis of electron scattering data, refinements of bound-state QED calculations, new theories describing the proton structure, and proposals for new scattering and H spectroscopy experiments.

As next step, two new (i.e., never before attempted) measurements are planned: the ground-state hyperfine splitting (1S-HFS) in both μp and μ3He+ with 1 ppm relative accuracy by means of pulsed laser spectroscopy. From these measurements the nuclear-structure contributions (two-photon-exchange) can be extracted with a relative accuracy of 100 ppm which in turn can be used to extract the corresponding Zemach radii (with a relative accuracy of 0.1%) and polarizability contributions. The Zemach radii can provide magnetic radii when form-factor data or models are assumed.

These radii are benchmarks for lattice QCD and few-nucleon theories. With the polarizability contribution they impact our models of the proton and of the 3He nucleus. Moreover, the μp measurement can be used to solve the discrepancy between the magnetic radii values as extracted from polarized and unpolarized electron scattering and to further test bound-state QED predictions of the 1S-HFS in H. These two experiments require a muon beam line, a target with an optical cavity, detector, and laser systems. As weak M1 transitions must be probed, large laser-pulse energies are needed, thus cutting-edge laser technologies (mainly thin-disk laser and parametric down-conversion) need to be developed. Laser schemes of potentially high industrial impact that have just been patented will be implemented and refined.


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