The Spin Structure of &lt;sup&gt;3&lt;/sup&gt;He and the Neutron at Low Q&lt;sup&gt;2&lt;/sup&gt;: A Measurement of the Generalized GDH Integrand

Sulkosky, V.

doi:10.2172/913561

Cited by 9 publications

(26 citation statements)

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“…However, a new set of high precision experiments has recently been completed at JLab with an emphasis on extending the data to lower Q 2 to make a bench-mark check of χPT predictions. This section will briefly discuss new g 1 measurements on the proton and deuteron from Hall B [29] and present the preliminary Hall A results on the neutron [30] from a polarized 3 He target. A new measurement on the proton δ LT polarizability [31] from Hall A was also presented at this conference by C. Gu and P. Zhu.…”

Section: Recent Experimental Progress and Preliminary Resultsmentioning

confidence: 99%

“…From these data, the polarized structure functions were extracted to form the integrals at Q 2 between 0.04 and 0.24 GeV 2 . The experimental details and data analysis can be found in [30]. The experiment made a high precision measurement of the moments of the spin structure functions in a previously unmeasured region of kinematics to test χPT calculations.…”

Section: Pos(cd12)023mentioning

confidence: 99%

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An Overview of Longitudinal Spin Structure Measurements at Jefferson Lab

Sulkosky¹

2013

Proceedings of the 7th International Workshop on Chiral Dynamics — PoS(CD12)

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is currently one of the facilities leading the investigation of the spin structure of the nucleon. Over the past 15 years, several high precision measurements have been completed, extending our knowledge of the polarized structure functions g 1 and g 2 down to Q 2 = 0.02 GeV 2. In particular, the low-Q 2 range ≤ 0.1 GeV 2 from these data allows us to make a benchmark-check of Chiral Perturbation theory (χPT). Previous results for the moments of the spin structure functions in this region have shown mixed agreement. For Γ 1 , the first moment of g 1 , we find good consistency between data and theory. However, we have seen a surprisingly large discrepancy with χPT calculations for the δ LT spin polarizability on the neutron, which is significantly less sensitive to the ∆-resonance contribution. These proceedings will discuss the recent experimental effort at low Q 2 from Jefferson Lab, including a discussion of preliminary results on the neutron. The new results on the neutron still show a sizeable discrepancy between data and theory. However, new calculations show improved agreement with data for some observables. In addition, new proton data for g 2 is also expected to help resolve the disagreement for δ LT .

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Section: Recent Experimental Progress and Preliminary Resultsmentioning

confidence: 99%

Section: Pos(cd12)023mentioning

confidence: 99%

An Overview of Longitudinal Spin Structure Measurements at Jefferson Lab

Sulkosky¹

2013

Proceedings of the 7th International Workshop on Chiral Dynamics — PoS(CD12)

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“…All the data used for this analysis were taken during the E97-110 experiment that ran in 2003 in Hall A [66]. The experiment consisted of scattering polarized electrons on a polarized 3 He gas target (see figure 6.1).…”

Section: Experiments Detailsmentioning

confidence: 99%

“…In order to obtain the generalized GDH sum rule at low Q 2 . As discussed in the introduction, this is another approach to understand non-perturbative QCD, because the GDH sum rule is a quantity defined and calculable at any Q 2 value [66]. Because of the small angles of the scattered electrons of 6 • and 9 • , a "Septum" magnet (small dipole magnet) was inserted between the target and the HRS to steer the scattered electrons to the HRS (otherwise, the minimal detection angle of the HRS pair is 15 • ).…”

Section: Experiments Detailsmentioning

confidence: 99%

Polarimetry of the polarized hydrogen deuteride HDice target under an electron beam

Lainé

2013

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The study of the nucleon structure has been a major research focus in fundamental physics in the past decades and still is the main research line of the Thomas Jefferson National Accelerator Facility (Jefferson Lab). For this purpose and to obtain statistically meaningful results, having both a polarized beam and a highly efficient polarized target is essential. For the target, this means high polarization and high relative density of polarized material. Retrospectively, I am really happy and feel lucky that I had the chance to meet and work with such great people. I know I have a lot of ups and downs, and that I am not easy to live with every day, thus I would like to thank everybody I have met until now for putting up with me. viii

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“…At Jefferson Lab, the 3 He polarized target has been used successfully in six experiments prior to E02-013 [80,81,82,83,84].…”

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confidence: 99%

A Measurement of the neutron electric form factor at very large momentum transfer using polaried electrions scattering from a polarized helium-3 target

Kelleher

2010

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Knowledge of the electric and magnetic elastic form factors of the nucleon is essential for an understanding of nucleon structure. Of the form factors, the electric form factor of the neutron has been measured over the smallest range in Q 2 and with the lowest precision. Jefferson Lab experiment 02-013 used a novel new polarized 3 He target to nearly double the range of momentum transfer in which the neutron form factor has been studied and to measure it with much higher precision. Polarized electrons were scattered off this target, and both the scattered electron and neutron were detected. G n E was measured to be 0.0242 ± 0.0020(stat) ± 0.0061(sys) and 0.0247 ± 0.0029(stat) ± 0.0031(sys) at Q 2 = 1.7 and 2.5 GeV 2 , respectively.

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The Spin Structure of <sup>3</sup>He and the Neutron at Low Q<sup>2</sup>: A Measurement of the Generalized GDH Integrand

Cited by 9 publications

References 40 publications

An Overview of Longitudinal Spin Structure Measurements at Jefferson Lab

An Overview of Longitudinal Spin Structure Measurements at Jefferson Lab

Polarimetry of the polarized hydrogen deuteride HDice target under an electron beam

A Measurement of the neutron electric form factor at very large momentum transfer using polaried electrions scattering from a polarized helium-3 target

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