We present data on the inclusive scattering of polarized electrons from a polarized 3He target at energies from 0.862 to 5.06 GeV, obtained at a scattering angle of 15.5 degrees. Our data include measurements from the quasielastic peak, through the nucleon resonance region, and beyond, and were used to determine the virtual photon cross-section difference sigma(1/2)-sigma(3/2). We extract the extended Gerasimov-Drell-Hearn integral for the neutron in the range of four-momentum transfer squared Q2 of 0.1-0.9 GeV2.
We have measured the spin structure functions g(1) and g(2) of 3He in a double-spin experiment by inclusively scattering polarized electrons at energies ranging from 0.862 to 5.058 GeV off a polarized 3He target at a 15.5 degrees scattering angle. Excitation energies covered the resonance and the onset of the deep inelastic regions. We have determined for the first time the Q2 evolution of Gamma(1)(Q2)= integral (1)(0)g(1)(x,Q2)dx, Gamma(2)(Q2)= integral (1)(0)g(2)(x,Q2)dx, and d(2)(Q2)= integral (1)(0)x(2)[2g(1)(x,Q2)+3g(2)(x,Q2)]dx for the neutron in the range 0.1< or =Q2< or =0.9 GeV2 with good precision. Gamma(1)(Q2) displays a smooth variation from high to low Q2. The Burkhardt-Cottingham sum rule holds within uncertainties and d(2) is nonzero over the measured range.
We report measurements of cross sections for the reaction 1 H(e,eЈK ϩ )Y , for both the ⌳ and ⌺ 0 hyperon states, at an invariant mass of Wϭ1.84 GeV and four-momentum transfers 0.5ϽQ 2 Ͻ2 (GeV/c) 2 . Data were taken for three values of virtual photon polarization ⑀, allowing the decomposition of the cross sections into longitudinal and transverse components. The ⌳ data are a revised analysis of prior work, whereas the ⌺ 0 results have not been previously reported.
The 1 H͑e, e 0 K 1 ͒L reaction was studied as a function of the squared four-momentum transfer, Q 2 , and the virtual photon polarization,´. For each of four Q 2 settings, 0.52, 0.75, 1.00, and 2.00 ͑GeV͞c͒ 2 , the longitudinal and transverse virtual photon cross sections were extracted in measurements at three virtual photon polarizations. The Q 2 dependence of the s L ͞s T ratio differs significantly from current theoretical predictions. This, combined with the precision of the measurement, implies a need for revision of existing calculations. [S0031-9007 (98) Flavor degrees of freedom provide qualitatively new tests of our understanding of baryon and meson structure. The electromagnetic production of kaons is important for further progress in many fields and subfields of physics such as hypernuclear production and spectroscopy ͑ ͑ ͑providing information complementary to that from hadronic reactions such as ͑K, p͒, ͑p, K͒, and ͑p, p 0 K͒ [1,2]͒ ͒ ͒, and some aspects of QCD model building ͑ ͑ ͑the ͑g, K͒ and the ͑e, e 0 K͒ reactions are important for an improved understanding of the basic coupling constants needed in various nucleon-meson and quark models [3]͒ ͒ ͒ to name only a few. The use of virtual photons (electroproduction) as opposed to real photons (photoproduction) offers access to a much richer body of information because both the virtual photon mass and polarization can be varied independently [4].This Letter is a report on the first results of a study of associated kaon electroproduction on hydrogen using the medium-energy, high-intensity, electron beam at the Jefferson Laboratory (formerly CEBAF). The excellent beam qualities of the CEBAF accelerator combined with precision magnetic spectrometers allowed a detailed 0031-9007͞98͞81(9)͞1805(4)$15.00
We present a measurement of the spin-dependent cross sections for the 3H eẽ; e 0 X reaction in the quasielastic and resonance regions at a four-momentum transfer 0:1 Q 2 0:9 GeV 2 . The spin-PRL 101, 022303 (2008)
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.