Elastic form factor experiments: a serial story

Köhl, M.

doi:10.1007/978-94-007-4023-5_16

Cited by 1 publication

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References 81 publications

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“…MENU 2013 Figure 1. Current experimental status on the Sachs FF's ratio in the proton (black curves are phenomenological fits, the dotted line at R p = 1 represents the dipole model), plot is from [8]; the fit of the measurements by means of the polarization transfer method (referred by the bottom half of the labels in the plot) provides R p (Q 2 ) ≈ 1 − 0.13 Q 2 − 0.29 in evident disagreement with the Rosenbluth data (referred by the upper half of the labels in the plot). The discrepancy has triggered a renewed theoretical and experimental activity: currently the most favorite candidate that could explain it is the two photon exchange (TPE) [9] in the elementary process; in fact the Rosenbluth method is more sensitive to the TPE, while in the experiments that involve the interference term, the effects mainly cancel out.…”

Section: Epj Web Of Conferencesmentioning

confidence: 99%

Overview of nucleon form factor experiments with 12 GeV at Jefferson Lab

Cisbani

2014

EPJ Web of Conferences

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Abstract. Since the R. Hofstadter pioneering experiments in the '50s, the measurements of the electromagnetic space-like nucleon form factors (FF's) have been a precious source of information for the understanding of the internal structure of the nucleons.In the last 15 years, the polarization transfer experiments at the Thomas Jefferson National Accelerator Facility (JLab) have undermined our view of the mechanism of the electron scattering and renewed critical interest in the FF measurements.In the coming years, JLab, with its upgraded 12 GeV polarized, high intensity, electron beam combined to new targets and readout equipments, will offer unprecedented opportunities to extend the current proton and neutron FF's measurements to higher momentum transfer Q 2 and to improve statistical and uncertainties at lower Q 2 , where the nucleon size can be accurately investigated.The measurements at high Q 2 will provide also new insights on the elusive quark orbital angular momenta, will contribute to constraint two of the nucleon Generalized Parton Distributions that are expected to describe more consistently the nucleon structure, and in general will test the validity of quite a few fundamental nucleon models in a region of transition between perturbative and non perturbative regimes.A selection of the relevant properties of the FF's, and the main results of JLab are shortly reviewed; the new proposed and approved experiments on FF's at JLab are presented addressing some key details, the expected experimental achievements and the new equipment designed for them.

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Section: Epj Web Of Conferencesmentioning

confidence: 99%

Overview of nucleon form factor experiments with 12 GeV at Jefferson Lab

Cisbani

2014

EPJ Web of Conferences

View full text Add to dashboard Cite

show abstract

Elastic form factor experiments: a serial story

Cited by 1 publication

References 81 publications

Overview of nucleon form factor experiments with 12 GeV at Jefferson Lab

Overview of nucleon form factor experiments with 12 GeV at Jefferson Lab

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