A F Lung

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The HERMES experiment is collecting data on inclusive and semi-inclusive deep inelastic scattering of polarised positrons from polarised targets of H, D, and 3 He. These data give information on the spin structure of the nucleon. This paper describes the forward angle spectrometer built for this purpose. The spectrometer includes numerous tracking chambers(More)
The inclusive A(e,eЈ) cross section for xӍ1 was measured on 2 H, C, Fe, and Au for momentum transfers Q 2 from 1 to 6.8 ͑GeV/c) 2. The scaling behavior of the data was examined in the region of transition from y scaling to x scaling. Throughout this transitional region, the data exhibit ␰ scaling, reminiscent of the Bloom-Gilman duality seen in free nucleon(More)
  • E M Riordan, M W Krasny, K Lang, P De Barbara, A Bodek, S Dasu +21 others
  • 1987
We report results of an electron beam dump search for neutral particles with masses in the range 1 to 15 MeV and lifetimes T between lo-l4 and lo-lo s. No evidence was found for such an object. We rule out the existence of any 1.8 MeV pseudoscalar boson with r > 8.2 x lo-l5 s and an absorption cross section in matter less than 1 mb per nucleon, and exclude(More)
We have measured parity-violating asymmetries in elastic electron-proton scattering over the range of momentum transfers 0.12 < or =Q2 < or =1.0 GeV2. These asymmetries, arising from interference of the electromagnetic and neutral weak interactions, are sensitive to strange-quark contributions to the currents of the proton. The measurements were made at(More)
We present the results of a measurement of the spin-dependent asymmetry in 3 g (i , e ') inelastic scattering at kinematics on the low-energy transfer side of the quasielastic peak, including the region near the breakup threshold. Comparison with existing calculation., based upon the plane wave impulse approximation shows significant deviation between the(More)
We have measured parity violating asymmetries in elastic electron-proton and quasi-elastic electron-deuteron scattering at backward electron angle. These measurements have been done at two momentum transfers : Q 2 = 0.22 and 0.63 (GeV/c) 2. Together with our previous forward angle measurement [1], we can extract strange quark contributions to the(More)
  • N C R Makins, R Ent, M S Chapman, J Hansen, K Lee, R G Milner +40 others
  • 2010
The cross section for quasielastic 12C(e, e'p) scattering has been measured at momentum transfer Q~ = 1, 3, 5 , and 6.8 (Gev/c)'. The results are consistent with scattering from a single nucleon as the dominant process. The nuclear transparency is obtained and compared with theoretical calculations that incorporate color transparency effects. No significant(More)
  • J Arrington, D F Spokesperson, K Geesaman, R Hafidi, D H Holt, P E Potterveld +42 others
  • 2006
Inclusive scattering from nuclei at x > 1 is sensitive to the distribution of high momentum nucleons at low Q 2 values, and high momentum quarks at large Q 2 values. Large x data at 4 and 6 GeV are dominated by quasielastic and resonance production from high-momentum nucleons. With the 11 GeV beam, we propose to make measurements in the DIS region and(More)
Separated longitudinal and transverse cross sections for charged pion electroproduction from (1)H, (2)H, and (3)He were measured at Q(2) = 0.4 (GeV/c)(2) for two values of the invariant mass, W = 1.15 GeV and W = 1.60 GeV, in a search for a mass dependence which would signal the effect of nuclear pions. This is the first such study that includes recoil(More)