We propose a precision extraction of the neutron spin structure function g 1 and the virtual photon asymmetry An1 in the resonance region over a moderate Q 2 range (up to Q = 4:2(GeV=c)) using a polarized He target. The Bloom-Gilman duality has been experimentally demonstrated for the spin independent structure functions down to small values of Q. The proposed experiment combined with Deep-Inel...

We study the factorization of quasi generalized quark distributions with twist-2 parton distributions. use an approach which is different than that used in literature. Using we derive relations all at one-loop. The contributions from gluon are included. Our results apply not only to a spin-1/2 hadron but also those any spin.

Predictions for the single transverse spin asymmetry AN in semi-inclusive DIS processes are given; non negligible values of AN may arise from spin effects in the fragmentation of a polarized quark into a final hadron with a transverse momentum k⊥ with respect to the jet axis, the so-called Collins effect. The elementary single spin asymmetry of the fragmenting quark has been fixed in a previous...

Soft diffraction phenomena in elastic nucleon scattering are considered from the viewpoint of spin dependence interaction potential. Spin-dependent pomeron effects analyzed for pp scattering, and spin-dependent differential cross sections correlation parameters calculated. The parameter AN is examined on basis experimental data s=4.9 GeV up to 23.4GeV framework extended High Energy Generalized ...

A bstract Using an effective field theory approach for higher-spin fields, we derive the interactions of colour singlet and electrically neutral particles with a spin higher than unity, concentrating on spin-3/2, spin-2, spin-5/2 spin-3 cases. We compute decay rates production cross sections in main channels spin-3/2 spin-2 states at both electron-positron hadron colliders, identify most promis...

We report on our recent work on electroweak corrections to tt̄ production at hadron colliders. Specifically, we discuss the weak-interaction contributions to the top quark transverse momentum and tt̄ invariant mass distributions and an induced parity-violating top-spin asymmetry. PACS number(s): 12.15.Lk, 12.38.Bx, 13.88.+e, 14.65.Ha

I discuss inclusive and semi-inclusive lepton-hadron scattering emphasizing the importance of polarization in order to study various single or double spin asymmetries and the importance of particle identification and angular resolution in the dectection of final state particles to study azimuthal asymmetries. The observables obtained in this way enable a detailed study of quark and gluon correl...

The universality of single-spin asymmetry on inclusive π-meson production is discussed. This universality can be related to the hadron substructure— constituent quarks in the frame of the quark model for U-matrix. Polarization experiments give us an unique opportunity to probe the nucleon internal structure. While spin averaged cross-sections can be calculated within acceptable accuracy, curren...

We recently used a new ferrite rf dipole to study spin flipping of a 2.1 GeV/c vertically polarized proton beam stored in the COSY Cooler Synchrotron in Jülich, Germany. We swept the rf dipole's frequency through an rf-induced spin resonance to flip the beam's polarization direction. After determining the resonance's frequency, we varied the frequency range, frequency ramp time, and number of f...