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Chiral perturbation theory of the hyperfine splitting in (muonic) hydrogen
Franziska Hagelstein, Vadim Lensky, Vladimir Pascalutsa
The ongoing experimental efforts to measure the hyperfine transition in muonic hydrogen prompt an accurate evaluation of the proton-structure effects. At the leading order in ,…
Muonic-Atom Spectroscopy and Impact on Nuclear Structure and Precision QED Theory
Aldo Antognini, Sonia Bacca, Andreas Fleischmann +10
Recent progress in laser and x-ray spectroscopy of muonic atoms offers promising long-term possibilities at the intersection of atomic, nuclear and particle physics. In muonic hydr…
Two-photon exchange in (muonic) deuterium at N3LO in pionless effective field theory
Vadim Lensky, Franziska Hagelstein, Vladimir Pascalutsa
We present a study of the two-photon-exchange (-exchange) corrections to the -levels in muonic (D) and ordinary (D) deuterium within the pionless effective field theory (…
A reassessment of nuclear effects in muonic deuterium using pionless effective field theory at N3LO
Vadim Lensky, Franziska Hagelstein, Vladimir Pascalutsa
We provide a systematic assessment of the order- nuclear contributions to the Lamb shift of muonic deuterium, including the accompanying radiative corrections due to vacuum po…
The proton structure in and out of muonic hydrogen
Aldo Antognini, Franziska Hagelstein, Vladimir Pascalutsa
Laser spectroscopy of muonic atoms has been recently used to probe properties of light nuclei with unprecedented precision. We introduce nuclear effects in hydrogen-like atoms, nuc…
Deuteron VVCS and nuclear structure effects in muonic deuterium at N3LO in pionless EFT
Vadim Lensky, Franziska Hagelstein, Astrid Hiller Blin +1
We present our studies of the forward unpolarised doubly-virtual Compton scattering (VVCS) off the deuteron and the closely related two-photon-exchange (-exchange) corrections…
Nucleon Polarizabilities and Compton Scattering as a Playground for Chiral Perturbation Theory
Franziska Hagelstein
I give a summary of recent results on nucleon polarizabilities, with emphasis on chiral perturbation theory. The predictive calculations of Compton scattering off the nucleon are c…
Lower bound on the proton charge radius from electron scattering data
Franziska Hagelstein, Vladimir Pascalutsa
The proton charge-radius determinations from the electromagnetic form-factor measurements in electron-proton scattering require an extrapolation to zero momentum transfer ()…
Comment on "Measurement of the Dependence of the Deuteron Spin Structure Function and its Moments at Low with CLAS"
Vadim Lensky, Franziska Hagelstein, Astrid Hiller Blin +1
We argue that the recently published CLAS results on the deuteron spin polarizability [Adhikari {\it et al.}, Phys.\ Rev.\ Lett.\ {\bf 120}, 062501 (2018)], as well as their…
-Resonance in the Hydrogen Spectrum
Franziska Hagelstein
The electromagnetic excitation of the -resonance plays an appreciable role in the Lamb shift and hyperfine structure of muonic and electronic hydrogen. Its effect appears…
Exciting Nucleons in Compton Scattering and Hydrogen-Like Atoms
Franziska Hagelstein
This PhD thesis is devoted to the low-energy structure of the nucleon (proton and neutron) as seen through electromagnetic probes, e.g., electron and Compton scattering. The resear…
Evaluation of the forward Compton scattering off protons: II. Spin-dependent amplitude and observables
Oleksii Gryniuk, Franziska Hagelstein, Vladimir Pascalutsa
The forward Compton scattering off the proton is determined by substituting the empirical total photoabsorption cross sections into dispersive sum rules. In addition to the spin-in…
Nucleon Polarizabilities: from Compton Scattering to Hydrogen Atom
Franziska Hagelstein, Rory Miskimen, Vladimir Pascalutsa
We review the current state of knowledge of the nucleon polarizabilities and of their role in nucleon Compton scattering and in hydrogen spectrum. We discuss the basic concepts, th…
Proton structure in the hyperfine splitting of muonic hydrogen
Franziska Hagelstein, Vladimir Pascalutsa
We present the leading-order prediction of baryon chiral perturbation theory for the proton polarizability contribution to the 2S hyperfine splitting in muonic hydrogen, and compar…
Evaluation of the forward Compton scattering off protons: I. Spin-independent amplitude
Oleksii Gryniuk, Franziska Hagelstein, Vladimir Pascalutsa
We evaluate the forward Compton scattering off the proton, based on Kramers-Kronig kind of relations which express the Compton amplitudes in terms of integrals of total photoabsorp…