Precision measurements of $g_1$ of the proton and the deuteron with 6 GeV electrons

Abstract

The inclusive polarized structure functions of the proton and deuteron, g1p and g1d, were measured with high statistical precision using polarized 6 GeV electrons incident on a polarized ammonia target in Hall B at Jefferson Laboratory. Electrons scattered at lab angles between 18 and 45 degrees were detected using the CEBAF Large Acceptance Spectrometer (CLAS). For the usual DIS kinematics, Q^2>1 GeV^2 and the final-state invariant mass W>2 GeV, the ratio of polarized to unpolarized structure functions g1/F1 is found to be nearly independent of Q^2 at fixed x. Significant resonant structure is apparent at values of W up to 2.3 GeV. In the framework of perturbative QCD, the high-W results can be used to better constrain the polarization of quarks and gluons in the nucleon, as well as high-twist contributions.

References in corpus (4)

• The Deuteron Spin-dependent Structure Function g1d and its First Moment
• Empirical Fit to Inelastic Electron-Deuteron and Electron-Neutron Resonance Region Transverse Cross Sections
• Impact of CLAS and COMPASS data on Polarized Parton Densities and Higher Twist
• Proton Spin Structure in the Resonance Region

Cited by in corpus (33)

• Iterative Monte Carlo analysis of spin-dependent parton distributions
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• The Spin Structure of the Nucleon
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• New analysis concerning the strange quark polarization puzzle
• Novel approaches in Hadron Spectroscopy
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• Measurements of $d_2^n$ and $A_1^n$: Probing the neutron spin structure
• First analysis of world polarized DIS data with small-$x$ helicity evolution
• Nucleon resonance contributions to unpolarised inclusive electron scattering
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• Small- and large-x nucleon spin structure from a global QCD analysis of polarized Parton Distribution Functions
• Longitudinal double-spin asymmetry for inclusive jet and dijet production in polarized proton collisions at $\sqrt{s}=200$ GeV
• Polarized electron-deuteron deep-inelastic scattering with spectator nucleon tagging
• The Role of Nucleon Strangeness in Supernova Explosions
• Deep inelastic scattering from polarized spin-$1/2$ hadrons at low $x$ from string theory
• Resonant contributions to inclusive nucleon structure functions from exclusive meson electroproduction data
• Polarised parton distribution functions and proton spin
• Semi-Inclusive ${\pi }_0$ target and beam-target asymmetries from 6 GeV electron scattering with CLAS
• QCD evolution of the orbital angular momentum of quarks and gluons: Genuine twist-three part
• Nucleon form factors and parton distributions in nonlocal chiral effective theory
• Resonant contributions to polarized proton structure functions
• Target and beam-target spin asymmetries in exclusive pion electroproduction for $Q^2>1$ GeV${}^2$. II. $ep\to e{\pi }^{0}p$
• Target and Beam-Target Spin Asymmetries in Exclusive Pion Electroproduction for $Q^2>1$ GeV${}^2$. I. $ep\to e{\pi }^{+}n$
• Strange quark helicity in the proton from chiral effective theory
• Spin Orbit Correlations and the Structure of the Nucleon
• Beam-target double spin asymmetry in quasi-elastic electron scattering off the deuteron with CLAS
• Deciphering Twist-3 Chiral-Even GPDs in the Light-Front Quark-Diquark Model
• Can sea quark asymmetry shed light on the orbital angular momentum of the proton?
• Measurement of the nucleon spin structure functions for 0.01<$Q^2$<1 GeV${}^2$ using CLAS
• Toward Precision Helicity PDFs from Global DIS and SIDIS Fits with Projected EIC Measurements
• Polarized proton structure in the resonance region
• Helicity-dependent distribution of strange quarks in the proton from nonlocal chiral effective theory