Classical electron radius
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Extraction of the proton radius from electron-proton scattering data Open
We perform a new analysis of electron-proton scattering data to determine the proton electric and magnetic radii, enforcing model-independent constraints from form factor analyticity. A wide-ranging study of possible systematic effects is …
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Defining the proton radius: A unified treatment Open
There is significant current interest in knowing the value of the proton radius and also its proper definition. Combine the disparate literatures of hydrogen spectroscopy and diverse modern parton distributions to understand the meaning of…
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Consistency of electron scattering data with a small proton radius Open
We determine the charge radius of the proton by analyzing the published low momentum transfer electron-proton scattering data from Mainz. We note that polynomial expansions of the form factor converge for momentum transfers squared below $…
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Proton radius from electron scattering data Open
Background: The proton charge radius extracted from recent muonic hydrogen Lamb shift measurements is significantly smaller than that extracted from atomic hydrogen and electron scattering measurements. The discrepancy has become known as …
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Extraction of the Neutron Charge Radius from a Precision Calculation of the Deuteron Structure Radius Open
We present a high-accuracy calculation of the deuteron structure radius in chiral effective field theory. Our analysis employs the state-of-the-art semilocal two-nucleon potentials and takes into account two-body contributions to the charg…
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Something about Electron Dimension Open
In this study will be exposed the theoretical principles necessary for the determination of the exact size of an electron in motion, depending on its speed of travel. Equations, aimed to accurately determines the radius R of the electron i…
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Proton radius from electron-proton scattering and chiral perturbation theory Open
We determine the root-mean-square proton charge radius, $R_{\\rm p}$, from a\nfit to low-$Q^2$ electron-proton elastic scattering cross section data with the\nhigher moments fixed (within uncertainties) to the values predicted by chiral\np…
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Evaluation of the strength of electron-proton scattering data for determining the proton charge radius Open
Precisely measured electron-proton elastic scattering cross sections [Phys.\nRev. Lett. {\\bf 105}, 242002 (2010)] are reanalyzed to evaluate their strength\nfor determining the rms charge radius ($R_{\\rm E}$) of the proton. More than\nha…
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Precise determination of the proton magnetic radius from electron scattering data Open
We extract the proton magnetic radius from high-precision electron-proton elastic scattering cross section data. Our theoretical framework combines dispersion analysis and chiral effective field theory and implements the dynamics governing…
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Compact stars with a small electric charge: the limiting radius to mass relation and the maximum mass for incompressible matter Open
\n One of the stiffest equations of state for matter in a compact star is constant energy density and this generates the interior Schwarzschild radius to mass relation and the Misner maximum mass for relativistic compact stars. If dark mat…
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On proton charge radius definition Open
We find a relation for the proton charge radius in closed form. The result 0.841235641(10) fm agrees with determinations from muonic hydrogen. Our relation is based on a mapping from an intrinsic configuration space for the proton to the o…
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Experiments towards resolving the proton charge radius puzzle Open
We review the status of the proton charge radius puzzle. Emphasis is given to the various experiments initiated to resolve the conflict between the muonic hydrogen results and the results from scattering and regular hydrogen spectroscopy.
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Sea quarks contribution to the nucleon magnetic moment and charge radius at the physical point Open
We report a comprehensive analysis of the light and strange disconnected-sea\nquarks contribution to the nucleon magnetic moment, charge radius, and the\nelectric and magnetic form factors. The lattice QCD calculation includes\nensembles a…
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PRad-II: A New Upgraded High Precision Measurement of the Proton Charge Radius Open
The PRad experiment has credibly demonstrated the advantages of the calorimetric method in e-p scattering experiments to measure the proton root-mean-square (RMS) charge radius with high accuracy. The PRad result, within its experimental u…
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Hadron and light nucleus radii from electron scattering* Open
Conceptually, radii are amongst the simplest Poincaré-invariant properties that can be associated with hadrons and light nuclei. Accurate values of these quantities are necessary so that one may judge the character of putative solutions to…
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Accuracy of the optical determination of the proton charge radius Open
Determination of the proton charge radius by different methods has produced\nan inconsistency. The most precise value (from spectroscopy of muonic hydrogen)\nstrongly disagrees with three less accurate values (from spectroscopy of\nordinar…
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The mean square radius of the neutron distribution and the skin thickness derived from electron scattering Open
The second-order moment of the nuclear charge density ($R^2_c$) is dominated by the mean square radius (msr) of the point proton distribution ($R_p^2$), while the fourth-order moment($Q^4_c$) depends on the msr of the point neutron one ($R…
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Something About Electron Dimension Open
In this study will be exposed the theoretical principles necessary for the determination of the exact size of an electron in motion, depending on its speed of travel. Equations, aimed to accurately determines the radius R of the electron i…
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Simulation of nonlinear Compton scattering from bound electrons Open
Recent investigations by Fuchs et al. [Nat. Phys. 11, 964 (2015)] revealed an anomalous frequency shift in non-linear Compton scattering of high-intensity X-rays by electrons in solid beryllium. This frequency shift was at least 800 eV to …
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Electron-electron scattering and transport properties of spin-orbit coupled electron gas Open
We calculate the electrical and thermal conductivity of a two-dimensional electron gas with strong spin--orbit coupling in which the scattering is dominated by electron--electron collisions. Despite the apparent absence of Galilean invaria…
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Attosecond electron bunch measurement with coherent nonlinear Thomson scattering Open
We present a novel method for measurement of ultrashort electron-bunch duration, in principle, as short as zeptosecond (10−21 s). The method employs nonlinear Thomson scattering of relativistically intense laser light, and takes advantage …
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On the Fundamental Physical Constants: I. Phenomenology Open
The fundamental physical constants (FCs) are parametrized. The results reveal that: 1) FCs are field coupling constants. With the exception of ratio of identities such as μ = mp/me, there are no dimensionless constants – all FCs, including…
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Sensitivity of the elastic electron-proton cross section to the proton\n radius Open
The precise determination of the proton radius from recent elastic scattering\nelectron-proton data is discussed. The necessary precision on the elastic cross\nsection to discriminate among the values coming from atomic spectroscopy is\nsc…
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Lorentz-Abraham-Dirac and Landau-Lifshitz equations of motion and the solution to a relativistic electron in a counterpropagating laser beam Open
Beginning with a critical examination of the Lorentz-Abraham (LA) classical equation of motion for an extended charge and the closely related Lorentz-Abraham-Dirac (LAD) equation of motion for a mass-renormalized point-charge, the Landau-L…
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Evaluation of the proton charge radius from e-p scattering Open
In light of the proton radius puzzle, the discrepancy between measurements of the proton charge radius from muonic hydrogen and those from electronic hydrogen and electron-proton scattering measurements, we reexamine the charge radius extr…
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A Possible Explanation of the Proton Radius Puzzle Based on the Second Flavor of Muonic Hydrogen Atoms Open
The proton radius puzzle is one of the most fundamental challenges of modern physics. Before the year 2010, the proton charge radius rp was determined by the spectroscopic method, relying on the electron energy levels in hydrogen atoms, an…
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Quantum regime of a free-electron laser: relativistic approach Open
In the quantum regime of the free-electron laser, the dynamics of the electrons is not governed by continuous trajectories but by discrete jumps in momentum. In this article, we rederive the two crucial conditions to enter this quantum reg…
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A Novel Classical Model of the Free Electron Open
Previous models of the free electron using classical physics equations have predicted attributes that are inconsistent with the experimentally observed attributes. For example, the magnetic moment has been calculated for the observed spinn…
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The proton radius and its relatives - much ado about nothing? Open
I summarize the dispersion-theoretical analysis of the nucleon electromagnetic form factors. Special emphasis is given on the extraction of the proton charge radius and its relatives, the proton magnetic radius as well as the neutron magne…
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On the Structure of Electrons and Other Charged Leptons Open
A model of the electron is examined, allowing us to obtain its mass, spin and magnetic moment. The electron is represented as a sphere of classical radius (protoelektron) with zero rest mass, the rotating orbit radius of which is reduced v…