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Hyperfine splittings in muonic atoms and laser technology

Total Cost €


EC-Contrib. €






 HyperMu project word cloud

Explore the words cloud of the HyperMu project. It provides you a very rough idea of what is the project "HyperMu" about.

conversion    refinements    hydrogen    spectroscopy    puzzle    3he    model    transitions    unpolarized    cavity    scattering    refined    disk    standard    photon    ppm    electron    few       experiments    qcd    bound    line    laser    weak    turn    nuclear    extracted    sigma    reanalysis    exchange    hyperfine    energies       probed    detector    hundreds    corresponding    structure    form    attracted    polarizability    magnetic    mu    data    mainly    1s    muonic    contribution    radii    never    m1    schemes    ground    accuracy    pulsed    patented    assumed    predictions    extract    proposals    optical    physics    beam    edge    contributions    2s    2p    technologies    calculations    muon    lattice    thin    radius    cutting    models    polarized    describing    discrepancy    zemach    energy    devoted    proton    theories    relative    industrial    parametric    plan    hfs    attempted    pulse    ranging    potentially    publications    qed    splitting    benchmarks    nucleus    nucleon   

Project "HyperMu" data sheet

The following table provides information about the project.


Organization address
postcode: 5232

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country Switzerland [CH]
 Total cost 1˙999˙926 €
 EC max contribution 1˙999˙926 € (100%)
 Programme 1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
 Code Call ERC-2016-COG
 Funding Scheme ERC-COG
 Starting year 2017
 Duration (year-month-day) from 2017-10-01   to  2022-09-30


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    PAUL SCHERRER INSTITUT CH (VILLIGEN PSI) coordinator 1˙999˙926.00


 Project objective

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, I plan two new (i.e., never before attempted) measurements: 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 I have just patented will be implemented and refined.


year authors and title journal last update
List of publications.
2019 Karsten Schuhmann, Klaus Kirch, Andreas Knecht, Miroslaw Marszalek, Francois Nez, Jonas Nuber, Randolf Pohl, Ivo Schulthess, Laura Sinkunaite, Manuel Zeyen, Aldo Antognini
Passive alignment stability and auto-alignment of multipass amplifiers based on Fourier transforms
published pages: 2904, ISSN: 1559-128X, DOI: 10.1364/AO.58.002904
Applied Optics 58/11 2019-06-06
2018 C.M.B. Monteiro, F.D. Amaro, M.S. Sousa, M. Abdou-Ahmed, P. Amaro, F. Biraben, T. Chen, D.S. Covita, A.J. Dax, M. Diepold, L.M.P. Fernandes, B. Franke, S. Galtier, A.L. Gouvea, J. Götzfried, T. Graf, T.W. Hänsch, M. Hildebrandt, P. Indelicato, L. Julien, K. Kirch, A. Knecht, F. Kottmann, J.J. Krauth, Y. Liu, J. Machado, F. Mulhauser, B. Naar, T. Nebel, F. Nez, R. Pohl, J.P. Santos, J.M.F. dos Santos, K. Schuhmann, C.I. Szabo, D. Taqqu, J.F.C.A. Veloso, A. Antognini
On the double peak structure of avalanche photodiode response to monoenergetic x-rays at various temperatures and bias voltages
published pages: C01033-C01033, ISSN: 1748-0221, DOI: 10.1088/1748-0221/13/01/c01033
Journal of Instrumentation 13/01 2019-06-06
2017 Krauth, J. J.; Schuhmann, K.; Ahmed, M. Abdou; Amaro, F. D.; Amaro, P.; Biraben, F.; Cardoso, J. M. R.; Carvalho, M. L.; Covita, D. S.; Dax, A.; Dhawan, S.; Diepold, M.; Fernandes, L. M. P.; Franke, B.; Galtier, S.; Giesen, A.; Gouvea, A. L.; Götzfried, J.; Graf, T.; Guerra, M.; Haack, J.; Hänsch, T. W.; Hildebrandt, M.; Indelicato, P.; Julien, L.; Kirch, K.; Knecht, A.; Knowles, P.; Kottmann, F.; Bigot, E. -O. Le; Liu, Y. -W.; Lopes, J. A. M.; Ludhova, L.; Machado, J.; Monteiro, C. M. B.; Mulhauser, F.; Nebel, T.; Nez, F.; Rabinowitz, P.; Rapisarda, E.; Santos, J. M. F. dos; Santos, J. P.; Schaller, L. A.; Schwob, C.; Szabo, C. I.; Taqqu, D.; Veloso, J. F. C. A.; Voss, A.; Weichelt, B.; Willig, M.; Pohl, R.; Antognini, A.
The proton radius puzzle
published pages: , ISSN: , DOI:
3 2019-06-06
2018 Marc Diepold, Beatrice Franke, Julian J. Krauth, Aldo Antognini, Franz Kottmann, Randolf Pohl
Theory of the Lamb Shift and fine structure in muonic  4He ions and the muonic  3He– 4He Isotope Shift
published pages: 220-244, ISSN: 0003-4916, DOI: 10.1016/j.aop.2018.07.015
Annals of Physics 396 2019-06-06
2018 S Schmidt, M Willig, J Haack, R Horn, A Adamczak, M Abdou Ahmed, F D Amaro, P Amaro, F Biraben, P Carvalho, T-L Chen, L M P Fernandes, T Graf, M Guerra, T W Hänsch, M Hildebrandt, Y-C Huang, P Indelicato, L Julien, K Kirch, A Knecht, F Kottmann, J J Krauth, Y-W Liu, J Machado, M Marszalek, C M B Monteiro, F Nez, J Nuber, D N Patel, E Rapisarda, J M F dos Santos, J P Santos, P A O C Silva, L Sinkunaite, J-T Shy, K Schuhmann, I Schulthess, D Taqqu, J F C A Veloso, L-B Wang, M Zeyen, A Antognini, R Pohl
The next generation of laser spectroscopy experiments using light muonic atoms
published pages: 12010, ISSN: 1742-6588, DOI: 10.1088/1742-6596/1138/1/012010
Journal of Physics: Conference Series 1138 2019-06-06

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