Pion transverse charge density and the edge of hadrons

Carmignotto, M.; Horn, T.; Miller, Gerald A.

doi:10.1103/physrevc.90.025211

Cited by 18 publications

(28 citation statements)

References 43 publications

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“…In Ref. [41] the use of models is avoided and the impact of new experiments evaluated. This first attempt of a detailed analysis with spacelike data shows that the transverse charge density of the pion is larger than that of the proton close to the core and that the two densities coalesce for impact parameters greater than 0.3 fm.…”

Section: Experimental Determination Of Pion and Kaon Form Factorsmentioning

confidence: 99%

Meson Form Factors and Deep Exclusive Meson Production Experiments

Horn

2017

EPJ Web Conf.

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Abstract. Pion and kaon electroproduction data play a unique role in Nature and our understanding of them is essential for explaining hadron structure. Precision longitudinaltransverse separated pion and kaon cross sections are of particular interest. They allow for the extraction of meson form factors and validation of understanding of hard exclusive and semi-inclusive reactions (π + , K + , π 0 , γ) towards 3D hadron imaging and potential future flavor decomposition. We review recent data and present prospects for deep exclusive pion and kaon electroproduction at the 12 GeV Jefferson Lab including the prospects to use projected charged-and neutral pion data to further determine the spin, charge-parity and flavor of GPDs, including the helicity-flip GPDs.

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Section: Experimental Determination Of Pion and Kaon Form Factorsmentioning

confidence: 99%

Meson Form Factors and Deep Exclusive Meson Production Experiments

Horn

2017

EPJ Web Conf.

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“…Proton and pion transverse charge densities have been extracted from timelike [39] and spacelike [40,41,42] data. In the latter the extension to spacelike domain is accomplished by the use of dispersion relations and models to obtain separate real and imaginary parts.…”

Section: Insights From Data -Transverse Charge Densitiesmentioning

confidence: 99%

“…In Ref. [41] the use of models is avoided. This first attempt of a detailed analysis with spacelike data shows that the transverse charge density of the pion is larger than that of the proton close to the core and that the two densities coalesce for impact parameters greater than 0.3 fm.…”

Section: Insights From Data -Transverse Charge Densitiesmentioning

confidence: 99%

Meson Electroproduction Experiments At Jefferson Lab And The Kaon Form Factor

Horn¹

2017

Proceedings of the 26th International Nuclear Physics Conference — PoS(INPC2016)

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Pion and kaon form factors are of particular interest in our understanding of hadron structure as they are connected to the Goldstone modes of dynamical chiral symmetry breaking. The last decade saw a dramatic improvement in precision of charged pion form factor data and new results have become available on the pion transition form factor. Plans exist to nearly quadruple the momentum transfer over which the charged pion form factor is known. Data on the kaon form factor are sparse, mainly limited to the region that constrains the kaon electromagnetic radius from kaon-atomic electron scattering data. Kaon electro-production cross section data at large virtual photon mass allow one, in principle, to constrain the kaon form factor, although technical difficulties grow as compared to the pion case due to the larger kaon mass and further distance from the pole. Most of the precision cross section measurements at the 6 GeV Jefferson Lab were primarily designed for pions, but some of these experiments also captured kaons in their acceptance. Preliminary kaon cross section results from such experiments show an indication of kaon pole dominance allowing for the first extractions of the kaon form factor from kaon electroproduction data. Planned 12 GeV experiments will further investigate the role of the kaon pole and are anticipated to extend form factor extractions to Q 2 ∼ 5.5 GeV 2. The distribution of the fundamental constituents, the quarks and gluons, is expected to be different in pions, kaons, and nucleons. The Electron-Ion Collider with an acceptance optimized for forward physics has the potential for accessing pion and kaon structure functions over a large kinematic region through the Sullivan process. Initial uncertainty projections have been carried out and suggest that such measurements are feasible for both pions and kaons.

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“…Experimental prospects of the measurements of the pion form factor are briefly summarized in Ref. [24]. They include the approved E12-06-101 experiment at the upgraded Jefferson Laboratory (12-GeV JLab) fascility and measurements at the projected Electron-Ion Collider (EIC).…”

Section: Expected Constraints From Future Datamentioning

confidence: 99%

“…[25,26] and reproduced in Ref. [24] (for EIC, we assume the energy of the ion beam of 5 GeV, the lowest one considered there). With the 12 GeV energy, JLab will be able to measure F π for the momentum transfers up to ∼ 6 GeV 2 with the accuracy of ∼ 4%.…”

Section: Expected Constraints From Future Datamentioning

confidence: 99%

Constraining scenarios of the soft/hard transition for the pion electromagnetic form factor with expected data of 12 GeV Jefferson Lab experiments and of the electron-ion collider

Troitsky

2015

Phys. Rev. D

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It has been shown previously [1] that a non-perturbative relativistic constituent-quark model for the π-meson electromagnetic form factor allows for a quantitative description of the soft/hard transition, resulting in the correct Quantum-Chromodynamical asymptotics, including normalization, from the low-energy data without further parameter tuning. This happens universally whenever the constituent-quark mass is switched off. The energy range where the transition happens is therefore determined by the quark-mass running at intermediate energies and is not tightly constrained theoretically. Here we consider possible ways to pin down this energy range with coming experimental data. We demonstrate that expected experimental uncertainties of the 12-GeV Jefferson-Lab data are larger than the span of predictions of the model, so these data might be used for testing the model but not for determination of the soft/hard transition scale. Contrary, the projected Electron-Ion Collider will be capable of pinning down the scale.PACS numbers: 13

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Pion transverse charge density and the edge of hadrons

Cited by 18 publications

References 43 publications

Meson Form Factors and Deep Exclusive Meson Production Experiments

Meson Form Factors and Deep Exclusive Meson Production Experiments

Meson Electroproduction Experiments At Jefferson Lab And The Kaon Form Factor

Constraining scenarios of the soft/hard transition for the pion electromagnetic form factor with expected data of 12 GeV Jefferson Lab experiments and of the electron-ion collider

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