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7 papers · 1 filter
Polarization Asymmetry Zero in Heavy Quark Photoproduction and Leptoproduction Cross Sections
Stanley J. Brodsky, Ivan Schmidt
We demonstrate two novel features of the sea-quark contributions to the polarized structure functions and photoproduction cross sections, a zero sum rule and a zero crossing point…
New Sum Rules for Nucleon Tensor Charges
Bo-Qiang Ma, Ivan Schmidt
Two new sum rules for the quark tensor charges of the nucleon are proposed, based on a relation connecting the quark transversity distributions to the quark helicity distributions…
The Quark Spin Distributions of the Nucleon
Bo-Qiang Ma, Ivan Schmidt, Jacques Soffer
The quark helicity measured in polarized deep inelastic scattering is different from the quark spin in the rest frame of the nucleon. We point out that the quark spin distributions…
Behavior of excitonic levels in symmetric and asymmetric double quantum wells in a magnetic field
Francisco Vera, Zdenka Barticevic
We studied theoretically the excitonic energy levels and the optical absorption spectra for double quantum wells, both symmetric and asymmetric, in the presece of an homogeneous ma…
3-dimensional Rules for Finite-Temperature Loops
C. Dib, O. Espinosa, I. Schmidt
We present simple diagrammatic rules to write down Euclidean n-point functions at finite temperature directly in terms of 3-dimensional momentum integrals, without ever performing…
Number of Electrons per Collision as a Quark-Gluon Plasma Signal
C. Dib, O. Espinosa, P. D. Morley +1
We investigate whether the total number of electrons per collision, as a function of beam energy, is a potential quark-gluon-plasma (QGP) signature. At high beam energies, we find…