124 research outputs found

    Nuclear transparency and effective kaon-nucleon cross section from the A(e, e'K+) reaction

    Full text link
    We have determined the transparency of the nuclear medium to kaons from A(e,eK+)A(e,e^{'} K^{+}) measurements on 12^{12}C, 63^{63}Cu, and 197^{197}Au targets. The measurements were performed at the Jefferson Laboratory and span a range in four-momentum-transfer squared Q2^2=1.1 -- 3.0 GeV2^2. The nuclear transparency was defined as the ratio of measured kaon electroproduction cross sections with respect to deuterium, (σA/σD\sigma^{A}/\sigma^{D}). We further extracted the atomic number (AA) dependence of the transparency as parametrized by T=(A/2)α1T= (A/2)^{\alpha-1} and, within a simple model assumption, the in-medium effective kaon-nucleon cross sections. The effective cross sections extracted from the electroproduction data are found to be smaller than the free cross sections determined from kaon-nucleon scattering experiments, and the parameter α\alpha was found to be significantly larger than those obtained from kaon-nucleus scattering. We have included similar comparisons between pion- and proton-nucleon effective cross sections as determined from electron scattering experiments, and pion-nucleus and proton-nucleus scattering data.Comment: 7 pages, 5 figure

    Measurement of Nuclear Transparency for the A(e,e' pi^+) Reaction

    Full text link
    We have measured the nuclear transparency of the A(e,e' pi^+) process in ^{2}H,^{12}C, ^{27}Al, ^{63}Cu and ^{197}Au targets. These measurements were performed at the Jefferson Laboratory over a four momentum transfer squared range Q^2 = 1.1 - 4.7 (GeV/c)^2. The nuclear transparency was extracted as the super-ratio of (σA/σH)(\sigma_A/\sigma_H) from data to a model of pion-electroproduction from nuclei without pi-N final state interactions. The Q^2 and atomic number dependence of the nuclear transparency both show deviations from traditional nuclear physics expectations, and are consistent with calculations that include the quantum chromodynamical phenomenon of color transparency.Comment: 5 pages, 3 figs Changes to figure 2 and 3 (error band updated and theory curves updated

    Correlated Strength in Nuclear Spectral Function

    Full text link
    We have carried out an (e,e'p) experiment at high momentum transfer and in parallel kinematics to measure the strength of the nuclear spectral function S(k,E) at high nucleon momenta k and large removal energies E. This strength is related to the presence of short-range and tensor correlations, and was known hitherto only indirectly and with considerable uncertainty from the lack of strength in the independent-particle region. This experiment confirms by direct measurement the correlated strength predicted by theory.Comment: 4 pages, 2 figures, accepted by Phys. Rev. Let

    Longitudinal-Transverse Separations of Structure Functions at Low Q2Q^{2} for Hydrogen and Deuterium

    Get PDF
    We report on a study of the longitudinal to transverse cross section ratio, R=σL/σTR=\sigma_L/\sigma_T, at low values of xx and Q2Q^{2}, as determined from inclusive inelastic electron-hydrogen and electron-deuterium scattering data from Jefferson Lab Hall C spanning the four-momentum transfer range 0.06 <Q2<2.8 < Q^{2} < 2.8 GeV2^{2}. Even at the lowest values of Q2Q^{2}, RR remains nearly constant and does not disappear with decreasing Q2Q^{2}, as expected. We find a nearly identical behaviour for hydrogen and deuterium.Comment: 4 pages, 2 gigure

    Study of the A(e,e'π+\pi^+) Reaction on 1^1H, 2^2H, 12^{12}C, 27^{27}Al, 63^{63}Cu and 197^{197}Au

    Full text link
    Cross sections for the p(e,eπ+e,e'\pi^{+})n process on 1^1H, 2^2H, 12^{12}C, 27^{27}Al, 63^{63}Cu and 197^{197}Au targets were measured at the Thomas Jefferson National Accelerator Facility (Jefferson Lab) in order to extract the nuclear transparencies. Data were taken for four-momentum transfers ranging from Q2Q^2=1.1 to 4.8 GeV2^2 for a fixed center of mass energy of WW=2.14 GeV. The ratio of σL\sigma_L and σT\sigma_T was extracted from the measured cross sections for 1^1H, 2^2H, 12^{12}C and 63^{63}Cu targets at Q2Q^2 = 2.15 and 4.0 GeV2^2 allowing for additional studies of the reaction mechanism. The experimental setup and the analysis of the data are described in detail including systematic studies needed to obtain the results. The results for the nuclear transparency and the differential cross sections as a function of the pion momentum at the different values of Q2Q^2 are presented. Global features of the data are discussed and the data are compared with the results of model calculations for the p(e,eπ+e,e'\pi^{+})n reaction from nuclear targets.Comment: 28 pages, 19 figures, submited to PR

    Strange Quark Contributions to Parity-Violating Asymmetries in the Backward Angle G0 Electron Scattering Experiment

    Get PDF
    We have measured parity-violating asymmetries in elastic electron-proton and quasi-elastic electron-deuteron scattering at Q^2 = 0.22 and 0.63 GeV^2. They are sensitive to strange quark contributions to currents in the nucleon, and to the nucleon axial current. The results indicate strange quark contributions of < 10% of the charge and magnetic nucleon form factors at these four-momentum transfers. We also present the first measurement of anapole moment effects in the axial current at these four-momentum transfers.Comment: 5 pages, 2 figures, changed references, typo, and conten

    Scaling study of the pion electroproduction cross sections and the pion form factor

    Full text link
    The 1^{1}H(e,eπ+e,e^\prime \pi^+)n cross section was measured for a range of four-momentum transfer up to Q2Q^2=3.91 GeV2^2 at values of the invariant mass, WW, above the resonance region. The Q2Q^2-dependence of the longitudinal component is consistent with the Q2Q^2-scaling prediction for hard exclusive processes. This suggests that perturbative QCD concepts are applicable at rather low values of Q2Q^2. Pion form factor results, while consistent with the Q2Q^2-scaling prediction, are inconsistent in magnitude with perturbative QCD calculations. The extraction of Generalized Parton Distributions from hard exclusive processes assumes the dominance of the longitudinal term. However, transverse contributions to the cross section are still significant at Q2Q^2=3.91 GeV2^2.Comment: 6 pages, 3 figure

    Scaling of the F_2 structure function in nuclei and quark distributions at x>1

    Full text link
    We present new data on electron scattering from a range of nuclei taken in Hall C at Jefferson Lab. For heavy nuclei, we observe a rapid falloff in the cross section for x>1x>1, which is sensitive to short range contributions to the nuclear wave-function, and in deep inelastic scattering corresponds to probing extremely high momentum quarks. This result agrees with higher energy muon scattering measurements, but is in sharp contrast to neutrino scattering measurements which suggested a dramatic enhancement in the distribution of the `super-fast' quarks probed at x>1. The falloff at x>1 is noticeably stronger in ^2H and ^3He, but nearly identical for all heavier nuclei.Comment: 5 pages, 4 figures, to be submitted to physical revie
    corecore