Proton form factor from 0.15 to 0.79<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">fm</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo><mml:mn>2</mml:mn><mml:mn /></mml:mrow></mml:msup></mml:mrow></mml:math>

Murphy, J. J.; Shin, Yong Moon; Skopik, D. M.

doi:10.1103/physrevc.9.2125

Cited by 88 publications

(96 citation statements)

References 22 publications

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“…Ideally we should be able to check the central bending angle from the trajectory determined by the VDCs, when combined with the VDC position survey [165]. However, it's very difficult to define the spectrometer central trajectory 6 . To minimize bias, we cut on a very small region of the central part of the HRS acceptance and treated the events in this region as the central trajectories.…”

Section: Configuration Inputsmentioning

confidence: 99%

High Precision Measurement of the Proton Elastic Form Factor Ratio at Low Q<sup>2</sup>

Zhan

2010

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Experiment E08-007 measured the proton elastic form factor ratio µ p G E /G M in the range of Q 2 = 0.3−0.7(GeV/c) 2 by recoil polarimetry. Data were taken in 2008 at the Thomas Jefferson National Accelerator Facility in Virginia, USA. A 1.2 GeV polarized electron beam was scattered off a cryogenic hydrogen target. The recoil proton was detected in the left HRS in coincidence with the elasticly scattered electrons tagged by the BigBite spectrometer. The proton polarization was measured by the focal plane polarimeter (FPP).In this low Q 2 region, previous measurement from Jefferson Lab Hall A (LEDEX) along with various fits and calculations indicate substantial deviations of the ratio from unity. For this new measurement, the proposed statistical uncertainty (< 1%) was achieved. These new results are a few percent lower than expected from previous world data and fits, which indicate a smaller G Ep at this region. Beyond the intrinsic interest in nucleon structure, the new results also have implications in determining the proton Zemach radius and the strangeness form factors from parity violation experiments.

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Section: Configuration Inputsmentioning

confidence: 99%

High Precision Measurement of the Proton Elastic Form Factor Ratio at Low Q<sup>2</sup>

Zhan

2010

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“…Presented at the Workshop on Heavy Quarks at Fixed Target, Fermilab, Oct. [10][11][12]1998 2) Now at Imperial College, London SW7 2BZ, U.K. 3) …”

Section: )mentioning

confidence: 99%

“…Each event was normalized to its individual beam momentum to eliminate effects of the beam momentum spread. An unbinned maximum likelihood fit using dipole electric and magnetic form factors for the Σ − yields a mean squared charge radius of Sask./Orsay/SLAC [10,11], Mainz [9], dispersion-theoretical fit to all of above [12], and Lamb shift [13]. [16], Soliton: Soliton model [17], CQM+XC : Chiral constituent quark model including exchange currents [18].…”

Section: Charge Radiimentioning

confidence: 99%

Hyperon physics results from SELEX

Eschrich¹

1999

AIP Conference Proceedings

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“…, a e-mail: miham@kph.uni-mainz.de The existing data [7][8][9][10][11] are available only for Q 2 > 0.005 (GeV/c) 2 . Full black line shows results of the Dispersion analysis [12].…”

Section: Introductionmentioning

confidence: 99%

The initial state radiation experiment at MAMI

Mihovilovič¹,

Merkel²,

Weber³

2014

Proceedings of 52 International Winter Meeting on Nuclear Physics — PoS(Bormio2014)

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Abstract. In an attempt to contribute further insight into the discrepancy between the Lamb shift and elastic scattering determinations of the proton charge radius, a new experiment at MAMI is underway, aimed at measuring proton form-factors at very low momentum transfers by using a new technique based on initial state radiation. This paper reports on the conclusions of the pilot measurement performed in 2010, whose main goal was to check the feasibility of the proposed experiment and to recognize and overcome any obstacles before running the full experiment. The modifications to the experimental apparatus are then explained which significantly improved the quality of data collected in the full scale experiment, which was successfully executed in August 2013. At the end first findings of the new experiment are discussed.

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Proton form factor from 0.15 to 0.79fm−2

Cited by 88 publications

References 22 publications

High Precision Measurement of the Proton Elastic Form Factor Ratio at Low Q<sup>2</sup>

High Precision Measurement of the Proton Elastic Form Factor Ratio at Low Q<sup>2</sup>

Hyperon physics results from SELEX

The initial state radiation experiment at MAMI

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