A5028265044- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Nuclear physics research studies
- High-Energy Particle Collisions Research
- Atomic and Molecular Physics
- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Black Holes and Theoretical Physics
- Nonlinear Photonic Systems
- Quantum, superfluid, helium dynamics
- Nuclear Physics and Applications
- Superconducting Materials and Applications
- Advanced Chemical Physics Studies
- Inorganic Fluorides and Related Compounds
- Cosmology and Gravitation Theories
- Nonlinear Dynamics and Pattern Formation
- Molecular spectroscopy and chirality
- Algorithms and Data Compression
- Numerical methods for differential equations
- Strong Light-Matter Interactions
- Quantum Electrodynamics and Casimir Effect
- Scientific Research and Discoveries
- Electromagnetic Simulation and Numerical Methods
Johannes Gutenberg University Mainz
2015-2024
University of Tübingen
2024
Paul Scherrer Institute
2024
University of Warsaw
2024
John Garang Memorial University of Science and Technology
2022
Institute for Theoretical and Experimental Physics
2003-2020
Universidad Complutense de Madrid
2020
Kurchatov Institute
2015-2020
Moscow Engineering Physics Institute
2014-2018
University of Manchester
2011-2017
This article reviews recent literature and presents new calculations of the Lamb shift in light muonic atoms. Point-nucleus QED nuclear structure effects are treated consistently among all electronic atoms to allow for improved determination charge radii fundamental constants.
The proton polarizability effect in the muonic-hydrogen Lamb shift comes out as a prediction of baryon chiral perturbation theory at leading order and our calculation yields $$\Delta E^{(\mathrm{pol})} (2P-2S) = 8^{+3}_{-1}\, \upmu $$ eV. This result is consistent with most evaluations based on dispersive sum rules, but it about factor 2 smaller than recent obtained heavy-baryon theory. We also find that (1232)$$ -resonance excitation suppressed, entire contribution magnetic polarizability;...
We study excitation spectra of BPS-saturated topological solutions -- the kinks $\varphi^8$ scalar field model in $(1+1)$ dimensions, for three different choices parameters. demonstrate that some these have a vibrational mode, apart from trivial zero (translational) excitation. One considered is shown to modes. perform numerical calculation kink-kink scattering one variants model, and find critical collision velocity $v_{\scriptsize \mbox{cr}}$ separates regimes: inelastic bounce at...
We obtain leading- and next-to-leading-order predictions of chiral perturbation theory for several prominent moments nucleon structure functions. These parameter-free results turn out to be in overall agreement with the available empirical information on nearly all considered moments, region low momentum transfer $({Q}^{2}<0.3\phantom{\rule{4pt}{0ex}}{\mathrm{GeV}}^{2})$. Especially surprising is situation spin polarizability ${\ensuremath{\delta}}_{LT}$, which thus far was not reproducible...
We present a fit of the spin-independent electromagnetic polarizabilities proton to low-energy Compton scattering data in framework covariant baryon chiral effective field theory. Using Baldin sum rule constrain their sum, we obtain...
We update the predictions of SU(2) baryon chiral perturbation theory for dipole polarisabilities proton, $$\{ \alpha _{E1} , \, \beta _{M1}\}_p = \{ 11.2(0.7), 3.9(0.7)\} \times 10^{-4}$$ fm $$^3$$ and obtain corresponding quadrupole, dispersive, spin polarisabilities: $$ _{E2} _{M2} \}_p 17.3(3.9), -15.5(3.5)\} $$^5$$ $$\{\alpha _{E1\nu } _{M1\nu }\}_p -1.3(1.0), 7.1(2.5)\} \gamma _{E1E1} _{M1M1}, _{E1M2} _{M1E2} -3.3(0.8), 2.9(1.5),\, 0.2(0.2), 1.1(0.3) \} $$^4$$ . The results scalar are...
We examine the polarized doubly-virtual Compton scattering (VVCS) off nucleon using chiral perturbation theory ($\ensuremath{\chi}\mathrm{PT}$). The VVCS contains a wealth of information on spin structure which is relevant to calculation two-photon-exchange effects in atomic spectroscopy and electron scattering. report complete next-to-leading-order amplitudes ${S}_{1}(\ensuremath{\nu},{Q}^{2})$ ${S}_{2}(\ensuremath{\nu},{Q}^{2})$, corresponding functions ${g}_{1}(x,{Q}^{2})$...
We merge the dispersive relation approach and ab initio method to compute nuclear structure corrections Lamb shift in muonic deuterium. calculate deuteron response functions corresponding uncertainties up next-to-next-to-next-to-leading order chiral effective field theory compare our results selected electromagnetic data test validity of theory. then feed calculated over a wide range kinematics dispersion-theory formalism show that an improved accuracy is obtained compared with use available...
We investigate $p$-wave pion production in nucleon-nucleon collisions up to next-to-next-to-leading order chiral effective field theory. In particular, we show that it is possible describe simultaneously the amplitudes $\mathit{pn}\ensuremath{\rightarrow}\mathit{pp}{\ensuremath{\pi}}^{\ensuremath{-}}$, $\mathit{pp}\ensuremath{\rightarrow}\mathit{pn}{\ensuremath{\pi}}^{+}$, $\mathit{pp}\ensuremath{\rightarrow}d{\ensuremath{\pi}}^{+}$ channels by adjusting a single low-energy constant...
Abstract The ongoing experimental efforts to measure the hyperfine transition in muonic hydrogen prompt an accurate evaluation of proton-structure effects. At leading order $$\alpha $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>α</mml:mi></mml:math> , which is $$O(\alpha ^5)$$ xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>O</mml:mi><mml:mo>(</mml:mo><mml:msup><mml:mi>α</mml:mi><mml:mn>5</mml:mn></mml:msup><mml:mo>)</mml:mo></mml:mrow></mml:math>...
We attempt to rehabilitate a sum rule (proposed long ago by Bernab\'eu and Tarrach) which relates the electric polarizability of particle total photoabsorption quasireal longitudinally polarized photons that particle. discuss its perturbative verification in quantum electrodynamics (QED), is largely responsible for skepticism about validity. The failure QED test can be understood via Sugawara-Kanazawa theorem due nonvanishing contour contribution pertinent dispersion relation. show another...
We derive two new sum rules for the unpolarized doubly virtual Compton scattering process on a nucleon, which establish novel low-${Q}^{2}$ relations involving nucleon's generalized polarizabilities and moments of structure functions ${F}_{1}(x,{Q}^{2})$ ${F}_{2}(x,{Q}^{2})$. These facilitate determination some constants can only be accessed in off-forward scattering, not experimentally accessible at present. perform an empirical proton compare our results with next-to-leading-order chiral...
Utilizing the Foldy-Wouthuysen representation, we use a bottom-up approach to construct heavy-baryon Lagrangian terms, without employing relativistic as starting point. The couplings obtained this way feature straightforward $1/m$ expansion, which ensures Lorentz invariance order by in effective field theories. We illustrate possible applications with two examples context of chiral theory: pion-nucleon coupling, reproduces results literature, and pion-nucleon-delta does not employ...
The forward doubly-virtual Compton scattering (VVCS) off the nucleon contains a wealth of information on structure, relevant to calculation two-photon-exchange effects in atomic spectroscopy and electron scattering. We report complete next-to-leading-order (NLO) low-energy VVCS chiral perturbation theory ($\chi$PT). Here we focus unpolarized amplitudes $T_1(\nu, Q^2)$ $T_2(\nu, Q^2)$, corresponding structure functions $F_1(x, $F_2(x,Q^2)$. Our results are confronted, where possible, with...
We study excitations of solitary waves - the kinks in scalar models with degree eight polynomial self-interaction (1 + 1) dimensions. perform numerical studies scattering two an exponential asymptotic off each other and analyse occurring resonance phenomena. connect these phenomena to energy exchange between translational vibrational modes colliding kinks. also point out that interaction power-law can lead a long-range
We compare the predictions of different variants chiral effective field theory for $\ensuremath{\gamma}p$ elastic scattering differential cross section. pay particular attention to role pion loops, and impact that a heavy-baryon expansion has on behavior those loops. also correct erroneous results these loops were published by Pascalutsa Phillips [Phys. Rev. C 67, 055202 (2003)].
We present a detailed derivation of the two sum rules relating spin polarizabilities measured in real, virtual, and doubly virtual Compton scattering. For example, polarizability ${\ensuremath{\delta}}_{LT}$, accessed inclusive electron scattering, is related to ${\ensuremath{\gamma}}_{E1E1}$ slope generalized ${P}^{(M1,M1)1}\ensuremath{-}{P}^{(L1,L1)1}$, in, respectively, real verify these different variants chiral perturbation theory, discuss their empirical verification for proton,...