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Showing 1 to 18 of 18 for “"Nucleon spin"”.
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Nucleon-Nucleon Spin Dependent Scattering Amplitudes to Describe Final State Interactions in Electromagnetic and Electroweak Nuclear Processes
… no models readily available that provide nucleon-nucleon spin dependent scattering amplitudes at high energies (<em> s</em> ≥ 6 GeV<sup>2)</sup>. This work aims to provide a model for calculating these high-energy scattering amplitudes. The foundation of the model is Regge theory since it …
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Measuring the Neutron Spin Asymmetry A1n in the Valence Quark Region in Hall C at Jefferson Lab
The quest to understand how the nucleon spin is decomposed into its constituent quark and gluon spin and orbital angular momentum (OAM) components has been at the forefront of nuclear physics for decades. Due to the non-perturbative nature of Quantum Chromodynamics (QCD) - the theory describing how …
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Precision Measurement of the Spin Structure of the Proton and the Deuteron
… Stanford Linear Accelerator Center measured the spin structure functions <em>g</em>1 and <em>g</em>2 of the proton and deuteron using deep inelastic scattering of 50 GeV polarized electrons from dynamically polarized, solid <sup>15</sup>NH<sub>3</sub> and <sup>6</sup>LiD targets. Three …
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A Precision Measurement of the Neutron d2: Probing the Color Force
The g2 nucleon spin-dependent structure function measured in electron deep inelastic scattering contains information beyond the simple parton model description of the nucleon. It provides insight into quark-gluon correlations and a path to access the confining local color force a struck quark …
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Deeply Virtual Compton Scattering off unpolarised deuterium at HERMES
… successfully increased understanding of the “spin puzzle”, the spin structure of the nucleon, by providing high precision measurements of ∆Σ in the Quark Parton Model, the fraction of the spin carried by the current quarks. Following the link of another piece of the puzzle, the orbital angular …
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Measurement of the Deeply Virtual Compton Scattering Cross Section from the Proton at 10.6 GeV using the CLAS12 Detector
… when a lepton scatters from a quark inside a nucleon or a nucleus. Measurement of the DVCS cross section enables the study of the Generalized Parton Distributions (GPD), which plays a central role in understanding the QCD dynamics inside a hadron. Thus, the quark and gluon origin of the …
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Precision measurement of neutron spin asymmetry An1 at large xBj using CEBAF at 5.7 GeV
Nucleon spin structure has remained one of the key issues of hadronic physics since the 1980's. Among the unsolved questions, the neutron spin structure in the valence quark region (the large Bjorken variable XBj region) is of particular interest. The few data that existed in the large XBj region …
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Spin Structure Functions of the Deuteron Measured with CLAS in and Above the Resonance Region
<p>Spin structure functions of the nucleon in the region of large <em>x</em> and small to moderate <em>Q</em><sup>2</sup> continue to be of high current interest. The first moment of the spin structure function <em>g</em><sub>1</sub>, Γ<sub>1</sub>, goes through a rapid transition from the photon …
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Neutrino-nucleus neutral current elastic interactions measurement in MiniBooNE
… in turn, allow to improve the knowledge of nucleon structure. This thesis is devoted to the study of NCE interactions. Neutrino-nucleus neutral current elastic scattering accounts for about 18% of all neutrino interactions in MiniBooNE. Using a high-statistics, high purity sample of NCE …
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Transverse Spin Structure of the Proton Studied in Semi–inclusive DIS
The quark structure of the nucleon can be described by three fundamental quark distributions: the quark number density (giving the probability to find a quark with a certain momentum inside the nucleon), the quark helicity distribution and the quark transversity distribution. The latter two are the …
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Modeling quasi-free neutrino-nucleus reactions for accelerator-based experiments
… nuclear response is dominated by quasi-elastic nucleon-knockout processes and Delta-mediated one-pion production. To compute the corresponding cross sections, a fully relativistic framework based on hadronic degrees of freedom is developed. The weak hadron couplings are modeled through weak …
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Measurement of Generalized GDH Integrand for the Neutron and 3He at Low Q2
… quarks and gluons, the nuclear forces, and the nucleon mass and structure, still remain in the non-perturbative regime. Dispersive sum rules, based on universal principles, provide a data-driven approach to study the nucleon structure without model-dependencies. Among those sum rules, the well …
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Shining a Light on the Nucleus: Photonuclear Measurements from Correlations to Charmonium
… atomic nucleus is comprised of a collection of nucleons (protons and neutrons), which are bound together by the nucleon-nucleon (NN) interaction that originates from Quantum Chromodynamics (QCD). While most nucleons experience the force from the rest of the nucleus as a single net “mean-field” …
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Measurement of the Spin Structure Function GD1 of the Deuteron and Its Moments at Low Q2
… the deuteron were used to extract the deuteron's spin structure function <em>g</em>1 as well as the product <em>A</em>1<em>F</em>1 of the virtual photon asymmetry <em>A</em>1 and the unpolarized structure function <em>F</em>1. These extracted quantities, in turn, were used to evaluate three …
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A Measuremetn of Nucleon Quark Spin Distributions at HERMES
Submitted by Jesse Garrison (jagarris@illinois.edu) on 2012-01-12T21:22:54Z No. of bitstreams: 1 2000_bains.pdf: 3640816 bytes, checksum: 50b242b0fae08cc7b4e97a277a2f5cf5 (MD5)
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UNRAVELING THE NUCLEON 3D STRUCTURE FROM EXPERIMENT, LATTICE, AND GLOBAL ANALYSIS
In this work, we study the nucleon spin structures and derive a new twist-3 partonic sum rule for the transverse spin of the proton, which involves the well-known quark spin structure function $g_T(x)$, the less-studied but known transverse gluon polarization density $\Delta G_T(x)$, and quark and …
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Studying the Quark Structure of the Proton in High Energy Proton-Proton Collisions at RHIC
… thesis presents the first measurement of single spin asymmetries from inclusive di-hadron production in polarized proton-proton collisions at Relativistic Heavy Ion Collider. This measurement combines the transversity distribution function and a polarized di-hadron fragmentation function, …