329 citations · 3k across the 107 of their papers we have counts for
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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…
Forward doubly-virtual Compton scattering off an unpolarised deuteron in pionless effective field theory
Vadim Lensky, Astrid Hiller Blin, Vladimir Pascalutsa
We calculate the forward unpolarised doubly-virtual Compton scattering (VVCS) off the deuteron in the framework of pionless effective field theory, up to next-to-next-to-next-to-le…
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…
Partial-wave analysis of proton Compton scattering data below the pion-production threshold
Nadiia Krupina, Vadim Lensky, Vladimir Pascalutsa
Low-energy Compton scattering off the proton is used for determination of the proton polarizabilities. However, the present empirical determinations rely heavily on the theoretical…
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…
Theory Viewpoint on Extracting Nucleon Polarisabilities in Low-Energy Compton Scattering
Harald W. Griesshammer, Anatoly I. L'vov, Judith A. McGovern +3
During the workshop "Compton Scattering off Protons and Light Nuclei: pinning down the nucleon polarisabilities" (ECT*, Trento, Italy, 29 July -- 2 August 2013, http://www.ectstar.…
Polarizability relations across real and virtual Compton scattering processes
Vladimir Pascalutsa, Marc Vanderhaeghen
We derive two relations involving spin polarizabilities of a spin-1/2 particle and consider their empirical implications for the proton. Using the empirical values of the proton an…
Surpassing Wigner's causality bound in relativistic scattering with zero-range interaction
Vladimir Pascalutsa
It is shown that the relativistic zero-range potential scattering surpasses Wigner's causality bound, while being consistent with causality. The relativistic theory shows in additi…
Proton polarizabilities: status, relevance, prospects
Vladimir Pascalutsa
This is a brief review of the status of understanding the proton polarizabilities in chiral perturbation theory and of their relevance to the `proton charge radius puzzle'.
Separation of proton polarizabilities with the beam asymmetry of Compton scattering
Nadiia Krupina, Vladimir Pascalutsa
We propose to determine the magnetic dipole polarizability of the proton directly from the beam asymmetry of low-energy Compton scattering based on the fact that the leading non-Bo…
Pion-mass dispersion relation in the baryon sector
Vladimir Pascalutsa, Marc Vanderhaeghen, Jonathan M. M. Hall +1
By looking at the complex plane of the pion-mass squared we establish a dispersion relation which the static quantities, such as baryon masses, magnetic moments, polarizabilities,…
What different variants of chiral EFT predict for the proton Compton differential cross section - and why
Vadim Lensky, Judith A. McGovern, Daniel R. Phillips +1
We compare the predictions of different variants of chiral effective field theory for the gamma-p elastic scattering differential cross section. We pay particular attention to the…
Causality in the relativistic bound-state problem
Vladimir Pascalutsa
Although the exact Bethe-Salpeter equation is certainly the appropriate field-theoretic framework to describe the non-perturbative problem of scattering and bound states, the inevi…
Nucleon polarizabilities and Delta-resonance magnetic moment in chiral EFT
Vladimir Pascalutsa
Recent chiral EFT calculations of nucleon polarizabilities reveal a problem in the current empirical determination of proton's electromagnetic polarizabilities. We also report on t…
Chiral effective-field theory with a resonance and heavy fields
Vladimir Pascalutsa
Several conceptual points concerning the inclusion of the (1232) resonance in the framework of chiral effective-field theory are discussed, with an emphasis on the problem of po…