The process $$\bar p$$ p?e ? e + with polarized initial particles and proton form factors in time-like region

Bilenky, S.M.; Giunti, C.; Wataghin, V.

doi:10.1007/bf01498628

Cited by 28 publications

(31 citation statements)

References 19 publications

(26 reference statements)

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“…Results for spin-dependent observables have been also published by other authors [3,33,55,56,57] based on various models, however, in general, for much higher energies.…”

Section: Resultsmentioning

confidence: 75%

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The electromagnetic form factors of the proton in the timelike region

2014

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The reactionspp → e + e − and e + e − →pp are analyzed in the near-threshold region. Specific emphasis is put on the role played by the interaction in the initial-or final antinucleon-nucleon (NN) state which is taken into account rigorously. For that purpose a recently publishedNN potential derived within chiral effective field theory and fitted to results of a new partial-wave analysis ofpp scattering data is employed. Our results provide strong support for the conjecture that the pronounced energy dependence of the e + e − ↔pp cross section, seen in pertinent experiments, is primarily due to thepp interaction. Predictions for the proton electromagnetic form factors G E and G M in the timelike region, close to theNN threshold, and for spin-dependent observables are presented. The steep rise of the effective form factor for energies close to thepp threshold is explained solely in terms of thepp interaction. The corresponding experimental information is quantitatively described by our calculation.

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“…Results for spin-dependent observables have been also published by other authors [3,33,55,56,57] based on various models, however, in general, for much higher energies.…”

Section: Resultsmentioning

confidence: 75%

“…[44,46,55,56]. Our predictions for A y and A i j at the excess energy Q = 45 MeV are depicted in Figs.…”

Section: Resultsmentioning

confidence: 90%

The electromagnetic form factors of the proton in the timelike region

2014

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“…Application of the Phragmén-Lindelhöf theorem [98] to the form factors shows that their asymptotic behavior must be the same, and that their ratio should go to 1 as Q 2 → ∞. The existing time-like proton formfactor data show that this condition is far from being satisfied at Q 2 =13 GeV 2 as discussed by Tomasi-Gustafsson and Rekalo [99].…”

Section: E Generalized Parton Distributions Lattice Qcd and Form Famentioning

confidence: 98%

Proton elastic form factor ratios toQ2=3.5GeV2by polarization transfer

Punjabi¹,

Perdrisat²,

Aniol³

et al. 2005

Phys. Rev. C

348

125

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The ratio of the proton elastic electromagnetic form factors, GEp/GMp, was obtained by measuring Pt and P ℓ , the transverse and longitudinal recoil proton polarization components, respectively, for the elastic ep → e p reaction in the four-momentum transfer squared range of 0.5 to 3.5 GeV 2 . In the single-photon exchange approximation, the ratio GEp/GMp is directly proportional to the ratio Pt/P ℓ . The simultaneous measurement of Pt and P ℓ in a polarimeter reduces systematic uncertainties. The results for the ratio GEp/GMp show a systematic decrease with increasing Q 2 , indicating for the first time a definite difference in the distribution of charge and magnetization in the proton. The data have been re-analyzed and systematic uncertainties have become significantly smaller than previously published results.

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“…The discussion of the constraints and consequences of a description in the full kinematical domain was firstly done in Ref. [14] and more recently in Refs. [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2005

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We perform a global analysis of the experimental data of the electromagnetic nucleon form factors, in space-like and time-like regions. We give the expressions of the observables in annihilation processes, such as p + p → ℓ + + ℓ − , ℓ = e or µ, in terms of form factors. We discuss some of the phenomenological models proposed in the literature for the space-like region, and consider their analytical continuation to the time-like region. After determining the parameters through a fit on the available data, we give predictions for the observables which will be experimentally accessible with large statistics, polarized annihilation reactions.

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The process $$\bar p$$ p?e ? e + with polarized initial particles and proton form factors in time-like region

Cited by 28 publications

References 19 publications

The electromagnetic form factors of the proton in the timelike region

The electromagnetic form factors of the proton in the timelike region

Proton elastic form factor ratios toQ2=3.5GeV2by polarization transfer

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

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