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Full-Text Articles in Physical Sciences and Mathematics
Nuclear Chiral Axial Currents And Applications To Few-Nucleon Systems, Alessandro Baroni
Nuclear Chiral Axial Currents And Applications To Few-Nucleon Systems, Alessandro Baroni
Physics Theses & Dissertations
This Thesis is divided into three main parts. The first part discusses basic aspects of chiral effective field theory and the formalism, based on time ordered perturbation theory, used to to derive the nuclear potentials and currents from the chiral Lagrangians. The second part deals with the actual derivation, up to one loop, of the two-nucleon potential and one- and two-nucleon weak axial charge and current. In both derivations ultraviolet divergences generated by loop corrections are isolated using dimensional regularization. The resulting axial current is finite and conserved in the chiral limit, while the axial charge requires renormalization. A complete …
Electroproduction Of Neutral Pion Off Helium-4, Bayram Torayev
Electroproduction Of Neutral Pion Off Helium-4, Bayram Torayev
Physics Theses & Dissertations
Deeply virtual exclusive processes offer a unique opportunity to study the internal structure of the nucleon and nuclei. The goal of this work is to extract the beam-spin asymmetry in deeply virtual coherent neutral pion electroproduction, e4He → e′4He′π0, using the CLAS detector in the experimental Hall B at Thomas Jefferson National Accelerator Facility. The data were collected in 2009 with a 6 GeV longitudinally polarized electron beam impinging on a 30 cm long, 6 atm Helium-4 gaseous target. In order to ensure that the process is coherent, a new Radial Time Projection Chamber …
Spin Structure Functions Of The Deuteron Measured With Clas In And Above The Resonance Region, Kahanawita G. Vipuli G. Dharmawardane
Spin Structure Functions Of The Deuteron Measured With Clas In And Above The Resonance Region, Kahanawita G. Vipuli G. Dharmawardane
Physics Theses & Dissertations
Spin structure functions of the nucleon in the region of large x and small to moderate Q2 continue to be of high current interest. The first moment of the spin structure function g1, Γ1, goes through a rapid transition from the photon point (Q2 = 0), where it is constrained by the Gerasimov-Drell-Hearn sum rule, to the deep inelastic limit where it is sensitive to the nucleon spin fraction carried by quarks. The interesting behavior in the transition region is dominated by baryon resonance excitations. We concluded an experiment to measure these observables …