2,566 research outputs found
Nuclear effects and higher twists in F3 structure function
We analyze the CCFR collaboration iron target data on the xF3 structure
function making particular emphasis on the extraction of the higher twist
contributions from data. Corrections for nuclear effects are applied in order
to extract data on the structure function of the isoscalar nucleon. Our
analysis confirms the observation made earlier, that the higher twist terms
depend strongly on the level to which QCD perturbation theory analysis is
applied. We discuss the impact of nuclear effects on the higher twist term as
well as on the QCD scale parameter Lambda_{\bar{MS}} extracted from the fit to
data.Comment: 16 pages, 2 figure
Determination of Polarized PDFs from a QCD Analysis of Inclusive and Semi-inclusive Deep Inelastic Scattering Data
A new combined next to leading order QCD analysis of the polarized inclusive
and semi-inclusive deep inelastic lepton-hadron scattering (DIS) data is
presented. In contrast to previous combined analyses, the terms
(kinematic - target mass corrections, and dynamic - higher twist corrections)
in the expression for the nucleon spin structure function are taken into
account. The new COMPASS data are included in the analysis. The impact of the
semi-inclusive data on the polarized parton densities (PDFs) and on the higher
twist corrections is discussed. The new results for the PDFs are compared to
our (Leader, Sidorov, Stamenov) LSS'06 PDFs, obtained from the fit to the
inclusive DIS data alone, and to those obtained from the de Florian, Sassot,
Stratmann, and Vogelsang global analysis.Comment: 11 pages, 8 figures, a version to be published in Phys. Rev.
Condensate splitting in an asymmetric double well for atom chip based sensors
We report on the adiabatic splitting of a BEC of Rb atoms by an
asymmetric double-well potential located above the edge of a perpendicularly
magnetized TbGdFeCo film atom chip. By controlling the barrier height and
double-well asymmetry the sensitivity of the axial splitting process is
investigated through observation of the fractional atom distribution between
the left and right wells. This process constitutes a novel sensor for which we
infer a single shot sensitivity to gravity fields of . From a simple analytic model we propose improvements
to chip-based gravity detectors using this demonstrated methodology.Comment: 4 pages, 5 figure
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