Towards an improved description of SiDIS by a polarized 3He target

The possibility of improving the description of the semi-inclusive deep inelastic electron scattering off polarized 3He, that provides information on the neutron single spin asymmetries, is illustrated. In particular, the analysis at finite momentum transfers in a Poincare' covariant framework is outlined and a generalized eikonal approach to include final state interaction is presented.Comment: 4 pages, 2 figures, presented at The 22nd European Conference on Few Body Problems in Physics, Krakow, Poland, 9 - 13 September 201

označavanje EMC učinaka i mehanizama hadronizacije poluinkluzivnim duboko-neelastičnim raspršenjem na jezgrama

The semi-inclusive deep inelastic scattering of electrons off a nucleus A with detection of a slow nucleus (A−1) in the ground or low excitation states, i.e. the process A(e,e′(A−1))X, can provide useful information on the origin of the EMC effect and the mechanisms of hadronization. The theoretical description of the process is reviewed and the results of several calculations on few-body systems and complex nuclei are presented.Poluinkluzivno duboko-neelastično raspršenje elektrona na jezgri A uz detekciju spore jezgre (A − 1) u osnovnom ili nisko-uzbudnom stanju, tj. proces A(e, e′ (A − 1))X, pruža vrijedne podatke o nastanku EMC učinka i mehanizama hadronizacije. Daje se teorijski opis procesa i predstavljaju ishodi više računa za malonukleoske sustave i za veće jezgre

označavanje EMC učinaka i mehanizama hadronizacije poluinkluzivnim duboko-neelastičnim raspršenjem na jezgrama

The semi-inclusive deep inelastic scattering of electrons off a nucleus A with detection of a slow nucleus (A−1) in the ground or low excitation states, i.e. the process A(e,e′(A−1))X, can provide useful information on the origin of the EMC effect and the mechanisms of hadronization. The theoretical description of the process is reviewed and the results of several calculations on few-body systems and complex nuclei are presented.Poluinkluzivno duboko-neelastično raspršenje elektrona na jezgri A uz detekciju spore jezgre (A − 1) u osnovnom ili nisko-uzbudnom stanju, tj. proces A(e, e′ (A − 1))X, pruža vrijedne podatke o nastanku EMC učinka i mehanizama hadronizacije. Daje se teorijski opis procesa i predstavljaju ishodi više računa za malonukleoske sustave i za veće jezgre

Pseudo-scalar mesons at finite temperatures from a Dyson-Schwinger-Bethe-Salpeter approach

The truncated Dyson-Schwinger–Bethe-Salpeter equations are employed at non-zero temperature. The truncations refer to a rainbow-ladder approximation augmented with an interaction kernel which facilitates a special temperature dependence. At low temperatures, T → 0, we recover a quark propagator from the Dyson-Schwinger (gap) equation smoothly interpolating to the T = 0 results. Utilizing that quark propagator we evaluate the Bethe-Salpeter vertex function in the pseudo-scalar qq̅ channel for the lowest boson Matsubara frequencies and find a competition of qq̅ bound states and quasi-free two-quark states at T = O (100 MeV)

Pseudo-scalar mesons at finite temperatures from a Dyson-Schwinger-Bethe-Salpeter approach

The truncated Dyson-Schwinger–Bethe-Salpeter equations are employed at non-zero temperature. The truncations refer to a rainbow-ladder approximation augmented with an interaction kernel which facilitates a special temperature dependence. At low temperatures, T → 0, we recover a quark propagator from the Dyson-Schwinger (gap) equation smoothly interpolating to the T = 0 results. Utilizing that quark propagator we evaluate the Bethe-Salpeter vertex function in the pseudo-scalar qq̅ channel for the lowest boson Matsubara frequencies and find a competition of qq̅ bound states and quasi-free two-quark states at T = O (100 MeV)

Transverse momentum distributions and nuclear effects

Abstract. A distorted spin-dependent spectral function for 3He is considered to take care of the final state interaction in the extraction of the quark transverse-momentum distributions in the neutron from semi-inclusive deep inelastic electron scattering off polarized 3He at finite momentum transfers. The generalization of the analysis in a Poincaré covariant framework within the light-front dynamics is outlined. The definition of the light-front spin-dependent spectral function for a J=1/2 system, as the nucleon, allows us to show that within the light-front dynamics and in the valence approximation only three of the six leading twist T-even transverse-momentum distributions are independent.

Transverse momentum distributions and nuclear effects

A distorted spin-dependent spectral function for 3He is considered to take care of the final state interaction in the extraction of the quark transverse-momentum distributions in the neutron from semi-inclusive deep inelastic electron scattering off polarized 3He at finite momentum transfers. The generalization of the analysis in a Poincaré covariant framework within the light-front dynamics is outlined. The definition of the light-front spin-dependent spectral function for a J=1/2 system, as the nucleon, allows us to show that within the light-front dynamics and in the valence approximation only three of the six leading twist T-even transverse-momentum distributions are independent