Global analysis of exclusive kaon and pion electroproduction

Horn, T.

doi:10.1103/physrevc.85.018202

Cited by 9 publications

(10 citation statements)

References 31 publications

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“…The results from Refs. [17,35] are consistent with the kaon pole factor, −t/(t − m 2 K ) 2 , giving less enhancement than that of the pion. However, calculations predict a small maximum in the kaon cross section near t=0.1 GeV 2 due to the kaon pole [29,30].…”

Section: Experimental Determination Of Pion and Kaon Form Factorssupporting

confidence: 62%

“…Nevertheless, detailed demonstration of the dominance of the kaon pole is required if one is to be confident in the extraction of F K . Current electroproduction data show that the t-dependence of the longitudinal kaon cross section is less steep than that of the pion [17,35]. These data include L/T separated cross sections up to photon energies of Q 2 =2.35 GeV 2 from Refs.…”

Section: Experimental Determination Of Pion and Kaon Form Factorsmentioning

confidence: 95%

“…The last decade has seen a dramatic improvement in the understanding of pion electroproduction data [14][15][16][17][18][19], which has given confidence in the reliability of the electroproduction method yielding the physical pion form factor. In general, the extraction of precision meson form factors from experiment requires a longitudinal-transverse (L/T) separation of the cross section isolating σ L , proper selection of the pion pole process, extraction of the form factor using a model, and the validation of the technique.…”

Section: Introductionmentioning

confidence: 99%

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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 Factorssupporting

confidence: 62%

Section: Experimental Determination Of Pion and Kaon Form Factorsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Meson Form Factors and Deep Exclusive Meson Production Experiments

Horn

2017

EPJ Web Conf.

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“…The value of F K was thus determined from a least squares fit of the Regge model prediction to the data. The transverse cross section is described well in shape, but underpredicted in magnitude, similar to what was observed for the transverse pion cross section [14,16,17,30]. Possible explanations and further work on the size of the transverse cross [20,27].…”

supporting

confidence: 65%

Separated kaon electroproduction cross section and the kaon form factor from 6 GeV JLab data

Carmignotto¹,

Ali²,

Aniol³

et al. 2018

Phys. Rev. C

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The 1 H(e, e ′ K + )Λ reaction was studied as a function of the Mandelstam variable −t using data from the E01-004 (FPI-2) and E93-018 experiments that were carried out in Hall C at the 6 GeV Jefferson Lab. The cross section was fully separated into longitudinal and transverse components, and two interference terms at four-momentum transfers Q 2 of 1.00, 1.36 and 2.07 GeV 2 . The kaon form factor was extracted from the longitudinal cross section using the Regge model by Vanderhaeghen, Guidal, and Laget. The results establish the method, previously used successfully for pion analyses, for extracting the kaon form factor. Data from 12 GeV Jefferson Lab experiments are expected to have sufficient precision to distinguish between theoretical predictions, for example recent perturbative QCD calculations with modern parton distribution amplitudes. The leadingtwist behavior for light mesons is predicted to set in for values of Q 2 between 5-10 GeV 2 , which makes data in the few GeV regime particularly interesting. The Q 2 dependence at fixed x and −t of the longitudinal cross section we extracted seems consistent with the QCD factorization prediction within the experimental uncertainty.The description of hadrons in terms of their constituents, the quarks and gluons, is a fundamental challenge in nuclear physics. Properties such as total charge and magnetic moments are well described in a constituent quark framework. However, charge and current distributions, which are more sensitive to the underlying dynamic processes in hadrons, are still not well described. The 1 H(e, e ′ K + )Λ reaction provides the simplest system including strangeness, and is thus an effective experimental test of flavor degrees of freedom.The electromagnetic form factors of hadrons are di-rectly connected to their internal structure. Measurements of the onset of the asymptotic, pointlike regime are an essential experimental verification of a key prediction of Quantum Chromodynamics (QCD) [1]. The form factors of light, two-quark hadronic systems like pions and kaons are of special importance as their asymptotic behavior is expected to set in earlier than that of threequark systems. The relevance of pion and kaon form factors, for both experiment and theory, is evident in the literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. A comprehensive review can be found in Ref. [19].

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“…Pion electroproduction data were also obtained at DESY [14][15][16] for values of Q 2 of 0.35 and 0.7 GeV 2 , and longitudinal (L) and transverse (T) cross sections were extracted using the Rosenbluth L/T separation method. With the availability of the highintensity, continuous electron beams and well-understood magnetic spectrometers at JLab it became possible to determine L/T separated cross sections with high precision, and thus to study the pion form factor in the regime of Q 2 =0.5-3.0 GeV 2 [17][18][19][20]35]. The pion form factor has been compared with different empirical fits and model calculations based on pQCD, lattice QCD, dispersion relations with QCD constraint, QCD sum rules, Bethe-Salpeter equation, local quark-hadron duality, constituent quark model, holographic QCD, etc.…”

Section: Extraction Of the Pion Form Factor From World Datamentioning

confidence: 99%

Pion transverse charge density and the edge of hadrons

2014

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We use the world data on the pion form factor for space-like kinematics and a technique previously used to extract the proton transverse densities, to extract the transverse pion charge density and its uncertainty due the incomplete knowledge of the pion form factor at large values of Q 2 and the experimental uncertainties. The pion charge density at small values of impact parameter b < 0.1 fm is dominated by this incompleteness error while the range between 0.1-0.3 fm is relatively well constrained. A comparison of pion and proton transverse charge densities shows that the pion is denser than the proton for values of b < 0.2 fm. The pion and proton transverse charge densities seem to be the same for values of b=0.3-0.6 fm. Future data from JLab 12 GeV and the EIC will increase the dynamic extent of the form factor data to higher values of Q 2 and thus reduce the uncertainties in the extracted pion transverse charge density.

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Global analysis of exclusive kaon and pion electroproduction

Cited by 9 publications

References 31 publications

Meson Form Factors and Deep Exclusive Meson Production Experiments

Meson Form Factors and Deep Exclusive Meson Production Experiments

Separated kaon electroproduction cross section and the kaon form factor from 6 GeV JLab data

Pion transverse charge density and the edge of hadrons

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