Cross section ratios for deep-inelastic scattering from {sup 14}N and {sup 3}He with respect to {sup 2}H have been measured by the HERMES experiment at DESY using a 27.5 GeV positron beam. The data ...cover a range in the Bjorken scaling variable x between 0.013 and 0.65, while the negative squared four-momentum transfer Q{sup 2} varies from 0.5 to 15 GeV{sup 2}. The data are compared to measurements performed by NMC, E665, and SLAC on {sup 4}He and {sup 12}C, and are found to be different for x<0.06 and Q{sup 2}<1.5 GeV{sup 2}. The observed difference is attributed to an A-dependence of the ratio R={sigma}{sub L}/{sigma}{sub T} of longitudinal to transverse deep-inelastic scattering cross sections at low x and low Q{sup 2}.
Evidence for a positive longitudinal double-spin asymmetry 〈
A
1
ρ
〉=0.24±0.11
stat±0.02
syst in the cross section for exclusive diffractive
ρ
0(770) vector–meson production in polarised ...lepton–proton scattering was observed by the HERMES experiment. The longitudinally polarised 27.56 GeV HERA positron beam was scattered off a longitudinally polarised pure hydrogen gas target. The average invariant mass of the photon–proton system has a value of 〈
W〉=4.9 GeV, while the average negative squared four-momentum of the virtual photon is 〈
Q
2〉=1.7 GeV
2. The ratio of the present result to the corresponding spin asymmetry in inclusive deep-inelastic scattering is in agreement with an early theoretical prediction based on the generalised vector–meson dominance model.
Phys.Rev.Lett.93:152301,2004 The generalized forward spin polarizabilities $\gamma_0$ and $\delta_{LT}$ of
the neutron have been extracted for the first time in a $Q^2$ range from 0.1 to
0.9 GeV$^2$. ...Since $\gamma_0$ is sensitive to nucleon resonances and
$\delta_{LT}$ is insensitive to the $\Delta$ resonance, it is expected that the
pair of forward spin polarizabilities should provide benchmark tests of the
current understanding of the chiral dynamics of QCD. The new results on
$\delta_{LT}$ show significant disagreement with Chiral Perturbation Theory
calculations, while the data for $\gamma_0$ at low $Q^2$ are in good agreement
with a next-to-lead order Relativistic Baryon Chiral Perturbation theory
calculation. The data show good agreement with the phenomenological MAID model.
The influence of amyxin, the Russian oral analog of tilorone, on the human interferon and immune status has been evaluated. As revealed by this investigation the administration of amyxin has produced ...a rise in the content of serum interferon, an increase in the capacity of leukocytes and lymphocytes for synthesizing alpha- and gamma-interferon, the activation of NK and phagocytizing cells of peripheral blood. No essential influence of amyxin on the amount of B and T lymphocytes, their subpopulations and the levels of the main classes of immunoglobulins has been established.
Results are reported from the HERMES experiment at HERA on a measurement of the neutron spin structure function g{sup n}{sub 1} (x, Q{sup 2}) in deep inelastic scattering using 27.5 GeV ...longitudinally polarized positrons incident on a polarized {sup 3}He internal gas target. The data cover the kinematic range 0.023 < x < 0.6 and 1 (GeV/c){sup 2} < Q{sup 2} < 15 (GeV/c){sup 2}. The integral {sup 0.6}{integral}{sub 0.023} g{sup n}{sub 1} (x) dx evaluated at a fixed Q2 of 2.5 (GeV/c)2 is -0.034 {+-} 0.013 (stat.){+-}0.005(syst.). Assuming Regge behavior at low x, the first moment {Gamma}{sup n}{sub 1} = {sup 1}{integral}{sub 0} g{sup n}{sub 1} (x) dx is -0.037{+-}0.013(stat.){+-}0.005(syst.){+-}0.006(extrapol.).
The generalized forward spin polarizabilities \(\gamma_0\) and \(\delta_{LT}\) of the neutron have been extracted for the first time in a \(Q^2\) range from 0.1 to 0.9 GeV\(^2\). Since \(\gamma_0\) ...is sensitive to nucleon resonances and \(\delta_{LT}\) is insensitive to the \(\Delta\) resonance, it is expected that the pair of forward spin polarizabilities should provide benchmark tests of the current understanding of the chiral dynamics of QCD. The new results on \(\delta_{LT}\) show significant disagreement with Chiral Perturbation Theory calculations, while the data for \(\gamma_0\) at low \(Q^2\) are in good agreement with a next-to-lead order Relativistic Baryon Chiral Perturbation theory calculation. The data show good agreement with the phenomenological MAID model.
The paper gives the data from studies of the physical development, health status, and immunity of 6- and 11-year-old children and 15-year-old adolescents. Correlations between the physical ...development and immune status of children and adolescents were studied. Negative immunological changes were more profound in children with severe physical developmental abnormalities.
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