Can the angular momentum of u-quarks in the nucleon be accessed at Hermes?
نویسنده
چکیده
We investigate the possibility to acquire information on the generalized parton distribution E and, through a model for E, also on the u-quark total angular momentum Ju by studying deeply virtual Compton scattering and hard exclusive ρ electroproduction on a transversely polarized hydrogen target at Hermes. It is found that a change in Ju from zero to 0.4 corresponds to a 4σ (2σ) difference in the calculated transverse target-spin asymmetry in deeply virtual Compton scattering (ρ electroproduction), where σ is the total experimental uncertainty. PACS. 1 2.38.Bx – 1 3.60Le
منابع مشابه
Hermes Measurement of the Spin Structure of the Nucleon
The HERMES experiment at the DESY Laboratory in Hamburg, Germany is designed to probe the spin structure of the nucleon by using deep inelastic scattering (DIS) of longitudinally polarized positrons on longitudinally and transversely polarized targets. The HERMES spectrometer has the ability to not only identify the scattered DIS positrons but as well the hadrons in coincidence with the scatter...
متن کاملTransverse Target-spin Asymmetry Associated with Dvcs on the Proton and a Resulting Model-dependent Constraint on the Total Angular Momentum of Quarks in the Nucleon
Results are reported on the transverse target-spin asymmetry associated with deeply virtual Compton scattering on the proton, extracted from the data accumulated by the HERMES experiment in the years 2002-2004. By comparing the HERMES results and theoretical predications based on a phenomenological model of generalized parton distributions, a model-dependent constraint on the total angular mome...
متن کاملHermes results on 3D imaging of the nucleon
The study of the quantum phase-space distribution of quarks and gluons inside nucleons in terms of TMDs and GPDs has become, in the last decade, a cutting-edge research field in hadron physics. These non-perturbative objects, respectively measurable in semi-inclusive deep-inelastic scattering and exclusive processes, allow to obtain 3dimensional representations of the nucleon in the momentum an...
متن کاملSivers Asymmetries for Inclusive Pion and Kaon Production in Deep-Inelastic Scattering
We calculate the Sivers distribution functions induced by the final-state interaction due to one-gluon exchange in diquark models of nucleon structure, treating the cases of scalar and axial-vector diquarks with both dipole and Gaussian form factors. We use these distribution functions to calculate the Sivers single-spin asymmetries for inclusive pion and kaon production in deep-inelastic scatt...
متن کاملHERA DVCS Results
Deeply Virtual Compton Scattering is the simplest interaction that allows access to Generalised Parton Distributions (GPDs), a theoretical framework that can be used to describe nucleon structure. The strong interest in GPDs results from the fact that they offer access to the total angular momentum of quarks inside the nucleon and to a 3-dimensional picture of nucleon structure. The measurement...
متن کامل