A Precise Measurement of the Spin Structure Functions G**P(2) G**D(2) from SLAC Experiment E155X

McNulty, D.

doi:10.2172/826653

Cited by 1 publication

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“…49 This assumes the Gaussian approximation translates to the projection, a valid assumption for angles as small as these. 50 This is an identical calculation, except that C = 0 and He = 1.90. 51 This "spread" is proportional to the inverse square of the beam energy, so it is also worse at lower beam energies.…”

Section: Application and Effects Of Fiducial Cutsmentioning

confidence: 99%

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Measurement of Inclusive Proton Double-Spin Asymmetries and Polarized Structure Functions

Fersch

2008

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PAGEThe scattering of polarized electrons from a polarized proton target provides a means for studying the internal spin structure of the proton. The CLAS (CEBAF Large Acceptance Spectrometer) EG1b experiment in Hall-B at Jefferson Laboratory measured double-spin inclusive and exclusive electron-nucleon scattering asymmetries using longitudinally polarized frozen NH 3 and ND 3 targets and a longitudinally polarized electron beam at 4 different energies (1.6, 2.5, 4.2, 5.6 GeV). Extraction of the virtual photon asymmetry A p 1 (for 0.05 GeV 2 < Q 2 < 5.0 GeV 2 ) provides precision measurements of the polarized proton spin-structure function g p 1 in and above the resonance region. Linear regression of data between the varying energies yields new constraints on the virtual photon asymmetry A p 2 (and thus the structure function g p 2 ) in the resonance region (for 0.3 GeV 2 < Q 2 < 1.0 GeV 2 ). Measurements of these structure functions and their moments allows testing of perturbative Quantum Chromodynamics (pQCD) models and evaluation of moments of the structure functions in the Operator Product Expansion. Testing of Chiral Perturbation Theory (χPT) at Q 2 < 0.2 GeV 2 is enabled by the new data. Other applications of polarized structure functions include measurement of fowardspin polarizability, evaluation of high-order corrections in 1 H hyperfine splitting, and testing of quark-hadron duality.

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Section: Application and Effects Of Fiducial Cutsmentioning

confidence: 99%

“…Twelve new additional error indices (41)(42)(43)(44)(45)(46)(47)(48)(49)(50)(51)(52) were defined, representing perturbations of P b P t by a standard deviation for each individual bracket prior to combination. The analysis was then run 12 more times.…”

Section: Statistical Uncertainty On P B P T (41-52)mentioning

confidence: 99%

Measurement of Inclusive Proton Double-Spin Asymmetries and Polarized Structure Functions

Fersch

2008

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A Precise Measurement of the Spin Structure Functions GP(2) GD(2) from SLAC Experiment E155X

Cited by 1 publication

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Measurement of Inclusive Proton Double-Spin Asymmetries and Polarized Structure Functions

Measurement of Inclusive Proton Double-Spin Asymmetries and Polarized Structure Functions

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