Measurement of the Neutron Electric Form Factor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>G</mml:mi></mml:mrow><mml:mrow><mml:mi>en</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>0.67</mml:mn><mml:mi /><mml:mo>(</mml:mo><mml:mi mathvariant="normal">GeV</mml:mi><mml:mi>/</mml:mi><mml:mi mathvariant="italic">c</mml:mi><mml:mo>)</mml:mo><mml:mn>2</mml:mn

Rohe, D.; Bartsch, P.; Baumann, D.; Becker, Jan; Bermuth, J.; Bohinc, Klemen; Böhm, R.; Buttazzoni, S.; Caprano, T.; Clawiter, N.; Deninger, A.; Derber, S.; Ding, M.; Distler, M. O.; Ebbes, A.; Ebert, M.; Ewald, I.; Friedrich, J.; Geiges, R.; Großmann, T.; Hauger, M.; Heil, W.; Honegger, A.; Jennewein, P.; Jourdan, J.; Kahrau, M.; Klein, A.; Köhl, M.; Krygier, K. W.; Kubon, G.; Liesenfeld, A.; Merkel, H.; Merle, K.; Merle, P.; Mühlbauer, M.; Müller, U.; Neuhausen, R.; Otten, E.; Petitjean, T.; Pospischil, Th.; Potokar, M.; Rosner, G.; Schmieden, H.; Sick, I.; Širca, S.; Surkau, R.; Wagner, Andreas; Walcher, Th.; Warren, G.; Weis, M.; Wöhrle, H.; Zeier, M.

doi:10.1103/physrevlett.83.4257

Cited by 165 publications

(99 citation statements)

References 23 publications

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“…The measured values of the electric form factors of the neutron are given in [20,21]. In [22,23], the following large Q 2 behavior of the electromagnetic form factors is obtained…”

Section: Numerical Resultsmentioning

confidence: 99%

Nucleon electromagnetic form factors in QCD

et al. 2008

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“…The measured values of the electric form factors of the neutron are given in [20,21]. In [22,23], the following large Q 2 behavior of the electromagnetic form factors is obtained…”

Section: Numerical Resultsmentioning

confidence: 99%

Nucleon electromagnetic form factors in QCD

et al. 2008

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“…Therefore, these 3 He data were not considered in the present fits. Note however, that the correction at Q 2 =0.67 (GeV/c) 2 is estimated to amount to only 10 %, which has not been applied to the data but is included in the systematical error [20].…”

Section: Fig 2 Recent Measurements Of G Nmentioning

confidence: 99%

“…The remaining uncertainty resides mainly in the corrections for final state interaction (FSI) and to a lesser extent for meson exchange currents (MEC) between the nucleons. Recent experiments have been performed at Bates, Amsterdam and Mainz by using polarised electrons scattering either from unpolarised deuterium and measuring the recoil polarisation of the neutron [16][17][18][19], or by measuring helicity dependences on polarised 3 He [20][21][22][23]. Only four of these data with sufficient statistical and systematic accuracy have been selected (Table I) and are displayed in Fig.…”

Section: Fig 2 Recent Measurements Of G Nmentioning

confidence: 99%

Moments of the Neutron Charge Form Factor and theN→ΔQuadrupole Transition

Grabmayr

Buchmann²

2001

Phys. Rev. Lett.

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Recent data allow a new parametrization of the neutron charge form factor G n E . A parameter-free quark-model relation between G n E and the N →∆ quadrupole form factor G N→∆ C2is used to predict G N→∆ C2 from G n E data. In particular, < r 2 n > is related to N →∆ quadrupole moment QN→∆, while < r 4 n > connects to the N →∆ quadrupole transition radius < r 2 N→∆ >. From the latter we derive an experimental value for the charge radius of the light constituent quarks rγq = 0.8 fm. Finally, the C2/M1 ratio in pion electroproduction is predicted from the elastic neutron form factor data.Intrinsic nucleon structure -The nucleon is a complicated many-particle system composed of valence quarks, which carry the quantum numbers, and nonvalence quark degrees of freedom, which describe the cloud of quark-antiquark (qq) pairs and gluons. The constituent quark model (CQM) with two-body exchange currents describes both these aspects of nucleon structure [1]. One-body currents describe the interaction of the photon with one valence quark at a time. Two-body exchange currents are connected with the exchange particles (gluons, pions) and with qq pairs (see Fig. 1(b-d)). Nucleon properties which are dominated by two-body exchange currents show their common dynamical origin in analytical interrelations.In this paper, a quark model relation between the neutron charge form factor G n E and the quadrupole transition form factor G N →∆ C2is used together with a parametrization of new G n E data to predict G N →∆ C2and the C2/M1 ratio usually measured by pion electroproduction. The spin-isospin dependence of the two-body charge operator ρ [2] , e.g. for the gluon, can be written schematically aswhere q is the three-momentum transfer, e i and σ i the quark charge and spin. Explicit expressions can be found in Ref.[1]. As a result of (i) the dominance of ρ [2] [1,2] and of (ii) the spin-isospin structure in ρ [2] and in the N and ∆ wave functions, a connection between the neutron charge form factor G n E (q 2 ) and the N →∆ quadrupole transition form factor G N →∆ C2(q 2 ) emerges [3] as follows:The derivation is independent of the spatial part of the quark wave functions and holds irrespective of whether gluon or pion exchange or both are employed. One-body contributions to G n E and G N →∆ C2arise only through excited-state admixtures which amount to less than 20% of the empirical values if a quark core radius consistent with the excitation spectrum [2,4] is used. Three-body corrections are estimated to contribute less than 30% of the two-body currents using a QCD parametrization [5] and a large 1/N c approach [6]. These approaches also show the dominance of the two-body exchange currents for both observables.The dominance of nonvalence quark degrees of freedom in G n E and G N →∆ C2is not specific to this quark model. Also chiral approaches, e.g. the Skyrme model [7], the σ-model [8], the Nambu-Jona-Lasinio model [9], and the chiral 1

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“…Starting in the early 1990's, the neutron electric FF G En has been obtained in several experiments at MAMI, by measuring the beam-target asymmetry in the exclusive quasi-elastic scattering of electrons from polarized 3 He in the 3 He( e, e ′ n)pp reaction [Mey94,Bec99,Roh99,Ber03]. All the G En data from polarization experiments are shown in Fig.…”

Section: Neutron Electric Form Factor Measurements With Polarization mentioning

confidence: 99%

Nucleon electromagnetic form factors

Perdrisat

Punjabi

Vanderhaeghen

2007

Progress in Particle and Nuclear Physics

469

583

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There has been much activity in the measurement of the elastic electromagnetic proton and neutron form factors in the last decade, and the quality of the data has been greatly improved by performing double polarization experiments, in comparison with previous unpolarized data. Here we review the experimental data base in view of the new results for the proton, and neutron, obtained at MIT-Bates, MAMI, and JLab. The rapid evolution of phenomenological models triggered by these high-precision experiments will be discussed, including the recent progress in the determination of the valence quark generalized parton distributions of the nucleon, as well as the steady rate of improvements made in the lattice QCD calculations.

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Measurement of the Neutron Electric Form FactorGenat0.67(GeV/c)2

Cited by 165 publications

References 23 publications

Nucleon electromagnetic form factors in QCD

Nucleon electromagnetic form factors in QCD

Moments of the Neutron Charge Form Factor and theN→ΔQuadrupole Transition

Nucleon electromagnetic form factors

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