Nucleon electromagnetic form factors and polarization observables in space-like and time-like regions

Tomasi–Gustafsson, E.; Lacroix, F.; Duterte, C.; Gakh, G. I.

doi:10.1140/epja/i2005-10030-6

Cited by 73 publications

(86 citation statements)

References 65 publications

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“…Note that the models reproduce qualitatively well the existing data in SL region (G E and G M for proton and neutron) and G eff in TL region, however the predictions for G E and hence for the ratio R = G E /G M as well as for polarization observables are very different [26].…”

Section: The Panda Contributionsupporting

confidence: 73%

Proton electromagnetic form factors: present status and future perspectives at PANDA

Tomasi–Gustafsson

2015

EPJ Web of Conferences

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Abstract. Data and models on electromagnetic proton form factors are reviewed, highlighting the contribution foreseen by the PANDA collaboration. Electromagnetic hadron form factors contain essential information on the internal structure of hadrons. Precise and surprising data have been obtained at electron accelerators, applying the polarization method in electron-proton elastic scattering. At electron-positron colliders, using initial state radiation, BABAR measured proton time-like form factors in a wide time-like kinematical region and the BESIII collaboration will measure very precisely proton and neutron form factors in the threshold region. In the next future an antiproton beam with momentum up to 15 GeV/c will be available at FAIR (Darmstadt). Measurements of the reactionp + p → e + + e − by the PANDA collaboration will contribute to the individual determination of electric and magnetic form factors in the time-like region of momentum transfer squared, as well as to their first determination in the unphysical region (below the kinematical threshold), through the reactionp + p → e + + e − + π 0 . From the discussion on feasibility studies at PANDA, we focus on the consequences of such measurements in view of an unified description of form factors in the full kinematical region. We present models which have the necessary analytical requirements and apply to the data in the whole kinematical region.

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Section: The Panda Contributionsupporting

confidence: 73%

Proton electromagnetic form factors: present status and future perspectives at PANDA

Tomasi–Gustafsson

2015

EPJ Web of Conferences

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“…It has been noted in [19] that it is possible to define an angular asymmetry, R, which can be measured from the differential cross section at θ = π/2. This measurement does not require polarised particles and R is defined in terms of the form factors as…”

Section: Asymmetries With Lepton Massmentioning

confidence: 99%

Polarisation observables in lepton-antilepton-to-proton-antiproton reactions including lepton mass

Buttimore

Jennings

2007

Eur. Phys. J. A

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General expressions, including the lepton mass, for the spin averaged differential cross section for the annihilation reaction lepton antilepton to proton antiproton are given, as well as general formulae for the single and double spin asymmetries in the centre of mass frame. In particular we discuss the single spin asymmetry, normal to the scattering plane, which measures the relative phase difference between nucleon electromagnetic form factors G E and G M . Recent experimental investigations of these form factors in the space and time like region are reviewed. It is thought that measurements of the phase of these form factors will provide fundamental information on the internal nucleon structure. The phases between G E and G M are accessible through polarisation observables measured in the antiproton proton to lepton antilepton reaction, or in its time reversed process.

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“…The curves are theoretical predictions from vector dominance model (solid green line), extended Gary-Krümpelmann (dash-dotted blue line), and a naive quark model (dashed red line) where the parameters have been adjusted as in ref. [75], and ref. [3] (dotted black line).…”

Section: Efficiency Correction and Fitmentioning

confidence: 92%

Feasibility studies of time-like proton electromagnetic form factors at $\overline{\rm P}$ P ¯ ANDA at FAIR

Singh¹,

Erni²,

Krusche³

et al. 2016

Eur. Phys. J. A

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Nucleon electromagnetic form factors and polarization observables in space-like and time-like regions

Cited by 73 publications

References 65 publications

Proton electromagnetic form factors: present status and future perspectives at PANDA

Proton electromagnetic form factors: present status and future perspectives at PANDA

Polarisation observables in lepton-antilepton-to-proton-antiproton reactions including lepton mass

Feasibility studies of time-like proton electromagnetic form factors at $\overline{\rm P}$ P ¯ ANDA at FAIR

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