Timelike nucleon electromagnetic form factors: All about interference of isospin amplitudes

Cao, Xu; Dai, J. P.

doi:10.1103/physrevd.105.l071503

Cited by 16 publications

(4 citation statements)

References 35 publications

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“…In 2015, Lorenz et al analyzed the EMFFs ratio and the effective FF of the proton from both TL and SL regions, and discussed possible contributions to the nucleon FFs from the vector meson φ(2170) or from final-state interaction (FSI) at the N ∆ + c.c and ∆ ∆ thresholds [54]. A recent phenomenology study, by Cao and Dai, has a joint discussion of the effective FF of proton and neutron, where the periodic structures could be explained by the contributions from pure isoscalar or isovector, or their orthogonal interference [55].…”

Section: Phenomenology Studies On the Proton Emffsmentioning

confidence: 99%

Time-like Proton Form Factors with Initial State Radiation Technique

2022

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Electromagnetic form factors are fundamental quantities describing the internal structure of hadrons. They can be measured with scattering processes in the space-like region and annihilation processes in the time-like region. The two regions are connected by crossing symmetry. The measurements of the proton electromagnetic form factors in the time-like region using the initial state radiation technique are reviewed. Recent experimental studies have shown that initial state radiation processes at high luminosity electron-positron colliders can be effectively used to probe the electromagnetic structure of hadrons. The BABAR experiment at the B-factory PEP-II in Stanford and the BESIII experiment at BEPCII (an electron positron collider in the τ-charm mass region) in Beijing have measured the time-like form factors of the proton using the initial state radiation process e+e−→pp¯γ. The two kinematical regions where the photon is emitted from the initial state at small and large polar angles have been investigated. In the first case, the photon is in the region not covered by the detector acceptance and is not detected. The Born cross section and the proton effective form factor have been measured over a wide and continuous range of the the momentum transfer squared q2 from the threshold up to 42 (GeV/c)2. The ratio of electric and magnetic form factors of the proton has been also determined. In this report, the theoretical aspect and the experimental studies of the initial state radiation process e+e−→pp¯γ are described. The measurements of the Born cross section and the proton form factors obtained in these analyses near the threshold region and in the relatively large q2 region are examined. The experimental results are compared to the predictions from theory and models. Their impact on our understanding of the nucleon structure is discussed.

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Section: Phenomenology Studies On the Proton Emffsmentioning

confidence: 99%

Time-like Proton Form Factors with Initial State Radiation Technique

2022

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“…An analysis of the constraint posed by the present data on this mixing has been carried out in Ref. [29] under the assumption that the isoscalar, I = 0, and isovector, I = 1, states are independently formed in the electromagnetic initial part of the process and not later remixed. Although the confirmation of a channel mixing would be a relevant phenomenon in itself, expressing pp and nn in terms of other states does not explain the origin of the pp and nn irregularities.…”

Section: Proton and Neutron Time-like Form Factorsmentioning

confidence: 99%

Compared analysis of time-like hyperon form factors

Bianconi,

Tomasi-Gustafsson

2022

Preprint

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Data on hyperon form factors recently obtained from annihilation reactions are compared each other, and to proton and neutron form factors, in terms of two kinematical variables: the transferred momentum square, q 2 , and the modulus P of the relative momentum between the outgoing baryons. They are critically discussed in terms of possible correlated structures. The present status of the time-like form factor data for baryons is described and suggestions are given on the reactions and the kinematical range where data are desirable in order to clarify the arisen questions.

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“…In the pioneering [11] and subsequent works [15][16][17], the oscillating behavior was explained as an interference of two mechanisms, acting at the hadron and at the quark scales, demonstrating the complex dynamical nature of the proton. More recently, different explanations have been put forward [18,19].…”

Section: Introductionmentioning

confidence: 99%

At the heart of the proton

Tomasi-Gustafsson,

Pacetti

2024

EPJ Web Conf.

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Two main findings on electromagnetic hadron form factors focussed a large interest of the hadron physics community in the recent years. One is the decrease of the electric to magnetic form factor ratio when the momentum transfer in electron proton elastic scattering increases. The second is the discovery of regular oscillations of the generalized proton form factors in the annihilation process electron-positron into proton-antiproton. In this talk we propose a coherent interpretation of these findings giving a general, dynamical description of the proton in the space-time frame which is based on the presence of a quantum vacuum at very small distances.

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Timelike nucleon electromagnetic form factors: All about interference of isospin amplitudes

Cited by 16 publications

References 35 publications

Time-like Proton Form Factors with Initial State Radiation Technique

Time-like Proton Form Factors with Initial State Radiation Technique

Compared analysis of time-like hyperon form factors

At the heart of the proton

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