Obiettivo 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 fromelectron scattering and hydrogen (H) spectroscopy. Hundreds of publications have been devoted to theso called “proton radius puzzle” ranging from studies of physics beyond the standard model, to reanalysisof electron scattering data, refinements of bound-state QED calculations, new theories describingthe 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 hyperfinesplitting (1S-HFS) in both μp and μ3He+ with 1 ppm relative accuracy by means of pulsed laserspectroscopy. 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 correspondingZemach radii (with a relative accuracy of 0.1%) and polarizability contributions. The Zemach radiican 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 contributionthey impact our models of the proton and of the 3He nucleus. Moreover, the μp measurementcan be used to solve the discrepancy between the magnetic radii values as extracted from polarized andunpolarized 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 lasersystems. As weak M1 transitions must be probed, large laser-pulse energies are needed, thus cutting-edgelaser 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 andrefined. Campo scientifico natural sciencesphysical sciencestheoretical physicsparticle physicsnatural sciencesphysical sciencesopticslaser physicspulsed lasersnatural sciencesphysical sciencesopticsspectroscopy Programma(i) H2020-EU.1.1. - EXCELLENT SCIENCE - European Research Council (ERC) Main Programme Argomento(i) ERC-2016-COG - ERC Consolidator Grant Invito a presentare proposte ERC-2016-COG Vedi altri progetti per questo bando Meccanismo di finanziamento ERC-COG - Consolidator Grant Istituzione ospitante PAUL SCHERRER INSTITUT Contribution nette de l'UE € 1 378 994,75 Indirizzo FORSCHUNGSTRASSE 111 5232 Villigen Psi Svizzera Mostra sulla mappa Regione Schweiz/Suisse/Svizzera Nordwestschweiz Aargau Tipo di attività Research Organisations Collegamenti Contatta l’organizzazione Opens in new window Sito web Opens in new window Partecipazione a programmi di R&I dell'UE Opens in new window Rete di collaborazione HORIZON Opens in new window Costo totale € 1 378 994,75 Beneficiari (2) Classifica in ordine alfabetico Classifica per Contributo netto dell'UE Espandi tutto Riduci tutto PAUL SCHERRER INSTITUT Svizzera Contribution nette de l'UE € 1 378 994,75 Indirizzo FORSCHUNGSTRASSE 111 5232 Villigen Psi Mostra sulla mappa Regione Schweiz/Suisse/Svizzera Nordwestschweiz Aargau Tipo di attività Research Organisations Collegamenti Contatta l’organizzazione Opens in new window Sito web Opens in new window Partecipazione a programmi di R&I dell'UE Opens in new window Rete di collaborazione HORIZON Opens in new window Costo totale € 1 378 994,75 EIDGENOESSISCHE TECHNISCHE HOCHSCHULE ZUERICH Svizzera Contribution nette de l'UE € 620 931,25 Indirizzo Raemistrasse 101 8092 Zuerich Mostra sulla mappa Regione Schweiz/Suisse/Svizzera Zürich Zürich Tipo di attività Higher or Secondary Education Establishments Collegamenti Contatta l’organizzazione Opens in new window Sito web Opens in new window Partecipazione a programmi di R&I dell'UE Opens in new window Rete di collaborazione HORIZON Opens in new window Costo totale € 620 931,25
