We analyze the double polarization asymmetry of the ω-meson photoproduction in the vector-meson–dominance model of diffractive production and the one-pion exchange model. We find that the longitudinal beam-target asymmetry is very sensitive to the real part of the diffractive photoproduction amplitude and to the sign of the ωπγ coupling because of the different spin structures of the amplitudes...

The measurement of the polarized gluon distribution function g(x) from photon gluon fusion processes in electron proton deep inelastic scattering producing two jets has been investigated. The study is based on the MEPJET simulation program. The size of the expected spin asymmetry and corresponding statistical uncertainties for a possible measurement with polarized beams of electrons and protons...

Spin–orbit coupling is a manifestation of special relativity. In the reference frame of a moving electron, electric fields transform into magnetic fields, which interact with the electron spin and lift the degeneracy of spin-up and spin-down states. In solid-state systems, the resulting spin–orbit fields are referred to as Dresselhaus and Rashba fields, depending on whether the electric fields ...

042802-1 Precision measurements of the relative analyzing powers of five electron beam polarimeters, based on Compton, Møller, and Mott scattering, have been performed using the CEBAF accelerator at the Thomas Jefferson National Accelerator Facility (Jefferson Laboratory). A Wien filter in the 100 keV beam line of the injector was used to vary the electron spin orientation exiting the injector....

The amplitude for hard exclusive pseudoscalar meson electroproduction off nucleon (nuclear) targets is computed in QCD within the leading αs ln Q/λQCD approximation. We show that the distribution of recoil nucleons depends strongly on the angle between the momentum of the recoil nucleon and the polarization vector of the target (or outgoing nucleon). This dependence is especially sensitive to t...

Once new particles are discovered at the LHC and their masses are measured, it will be of crucial importance to determine their spin, in order to identify the underlying new physics model. We investigate the method first suggested by Barr and later extended by others to distinguish between Supersymmetry and alternative models, e.g. Universal Extra Dimensions, in a certain cascade decay. This me...

We discuss the possibilities of testing of perturbative quantum chromodynamics through azimuthal asymmetries in polarized ep in the context of future collider and fixed target facilities, such as Electron Ion Collider and TESLA-N. It is widely recognized that the study of the distributions in the azimuthal angle φ of the detected hadron in hard scattering processes provide interesting variables...

Measurement of the double longitudinal spin asymmetry in inclusive jet production in polarized p+p collisions at √ s = 200 GeV Abstract We present preliminary results for the first measurements of the double longitudinal spin asymmetry A LL in inclusive jet production at mid-rapidity in polarized proton-proton collisions at √ s = 200 GeV. The data amount to ∼ 0.5 pb −1 collected at RHIC in 2003...

– We studied spin-polarized tunneling through a vacuum barrier using spinpolarized scanning tunneling microscopy on Co(0001). By varying the tip-to-sample distance in a controlled way, the tunneling magnetoresistance, i.e., the tunneling current asymmetry for parallel and antiparallel configuration of tip and sample magnetization, was measured as a function of the gap width. At large gap widths...

Measurement of the double longitudinal spin asymmetry in inclusive jet production in polarized p+p collisions at √ s = 200 GeV Abstract We present preliminary results for the first measurements of the double longitudinal spin asymmetry A LL in inclusive jet production at mid-rapidity in polarized proton-proton collisions at √ s = 200 GeV. The data amount to ∼ 0.5 pb −1 collected at RHIC in 2003...