6533b7d7fe1ef96bd1268eb3
RESEARCH PRODUCT
Sivers Asymmetry for the proton and the neutron
S. ScopettaA. CourtoyF. FratiniV. VentoSigfrido BoffiClaudio Ciofi Degli AttiMauro GianniniDaniele Treleanisubject
PhysicsQuantum chromodynamicsParticle physicsProtonNuclear Theorymedia_common.quotation_subjectNuclear TheoryConstituent quarkFOS: Physical sciencesDeep inelastic scatteringAsymmetryNuclear Theory (nucl-th)High Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)NeutronSum rule in quantum mechanicsmedia_commonSpin-½Particle Physics - Phenomenologydescription
A formalism is presented to evaluate the Sivers function in constituent quark models. A non-relativistic reduction of the scheme is performed and applied to the Isgur-Karl model. The results obtained are consistent with a sizable Sivers effect and the signs for the u and d flavor contributions turn out to be opposite. The Burkardt Sum Rule is fulfilled to a large extent. After the estimate of the QCD evolution of the results from the momentum scale of the model to the experimental one, a reasonable agreement with the available data is obtained. A calculation of nuclear effects in the extraction of neutron single spin asymmetries in semi-inclusive deep inelastic scattering off 3He is also described. In the kinematics of forth-coming experiments at JLab, it is found that the nuclear effects arising within an Impulse Approximation approach are under control.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2008-07-14 |