30,832 research outputs found

    M\"{o}ller and Bhabha scattering in the noncommutative standard model

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    We study the M\"{o}ller and Bhabha scattering in the noncommutative extension of the standard model(SM) using the Seiberg-Witten maps of this to first order of the noncommutative parameter θμν\theta_{\mu \nu}. We look at the angular distribution dσ/dΩd\sigma/d\Omega to explore the noncommutativity of space-time at around ΛNC\Lambda_{NC} \sim TeV and find that the distribution deviates significantly from the one obtained from the commutative version of the standard model.Comment: 15 pages, 14 eps figures.Text is modified a little and version to appear in Phys.Rev.

    Ionization of hydrogen atoms by electron impact at 1eV, 0.5eV and 0.3eV above threshold

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    We present here triple differential cross sections for ionization of hydrogen atoms by electron impact at 1eV, 0.5eV and 0.3eV energy above threshold, calculated in the hyperspherical partial wave theory. The results are in very good agreement with the available semiclassical results of Deb and Crothers \cite{DC02} for these energies. With this, we are able to demonstrate that the hyperspherical partial wave theory yields good cross sections from 30 eV \cite{DPC03} down to near threshold for equal energy sharing kinematics.Comment: 6 pages, 9 figure

    Nanoscale Magnetic Multilayers : Density Functional Calculations

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