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Showing 1 to 20 of 46 for “"Spin structure"”.
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Spin Structure of the Deuteron
<p>Double spin asymmetries for the proton and the deuteron have been measured in the EG1b experiment using the CLAS detector at Jefferson Lab. Longitudinally polarized electrons at energies 1.6, 2.5, 4.2 and 5.7 GeV were scattered from longitudinally polarized NH3 and ND3 targets. The double spin …
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Spin structure of nucleon in the asymptotic limit
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1996.
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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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Transverse Spin Structure of the Proton Studied in Semi-inclusive DIS
… zijn de verschillen in het aantal quarks met een spin parallel en antiparallel met de nucleonspin waarvan de richting respectievelijk longitudinaal of transversaal is t.o.v. zijn impuls. De eerste twee distributies zijn in het verleden uitgebreid gemeten. De transversale distributie is evenwel aan …
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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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Neutron Scattering Studies of Unusual Spin Structure and Local Correlation in Complex Oxides
… coupling between charge, lattice, orbital, and spin degrees of freedom, which can be tuned by chemical substitution, strain induction, or by the application of external stimulus (e.g. pressure, temperature, electric, or magnetic fields). Interest in CEMs is fueled by the richness of their novel …
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The proton's longitudinal spin structure studied through the weak interaction in pp collisions
… years there has been limited knowledge of the spin structure of the proton. The degree to which the antiquarks and gluons of radiative origin inside the proton contribute to the total spin is particularly not well confined. The PHENIX experiment at RHIC has made measurements that have, and …
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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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Spin structure of the proton and the Q² evolution of the Gerasimov-Drell-Hearn integral
… electron beam. For the first time, proton spin structure functions were studied with precision in the resonance region. The data indicate that a dramatic change in the spin structure occurs between the deep inelastic high Q2 region and the region of low Q2 where photons become nearly real.
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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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The radiance of the gluon spin : constraining the proton spin structure with the direct photon double helicity asymmetry
… experiments which first investigated the proton structure in detail revealed the importance of the vacuum. In particular, polarized DIS measurements uncovered a surprisingly inadequate quark polarization, necessitating significant contributions to the proton spin from elsewhere. The total spin of …
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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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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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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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Microscopic Calculations in Diffractive Deep Inelastic Scattering
… find higher twist corrections to the transverse structure functions and predict the diffractive slope and azimuthal asymmetries. We establish duality correspondence between diffraction into low-mass continuum and vector meson production, and calculate the diffractive contribution to the spin …
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On the super Mumford form in the presence of Ramond and Neveu-Schwarz punctures
… of the moduli space corresponding to an odd spin structure. The super Mumford form can be used to create a measure whose integral computes scattering amplitudes of superstring theory. We express it in terms of local bases of global sections of tensor powers of the Berezinian line bundle of a …
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Measurement of Generalized GDH Integrand for the Neutron and 3He at Low Q2
… 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 known …
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Measurement of the Proton A1 and A2 Spin Asymmetries: Probing Color Forces
The Spin Asymmetries of the Nucleon Experiment (SANE) measured the proton spin structure function g2 in a range of Bjorken x, 0.3 < x < 0.8, where extraction of the twist-3 matrix element dp2 (an integral of g2 weighted by x2) is most sensitive. The data was taken from Q2 equal to 2.5 GeV 2 up to …
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The landscape of free fermionic gauge models.
… brisk introduction to heterotic strings and the spin-structure construction of free fermionic models. Three systematic surveys are then presented, and we conjecture that these surveys are exhaustive modulo redundancies. Finally we present a collection of metaheuristic algorithms for searching the …
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Spinors, embeddings and gravity
This thesis is concerned with the theory of spinors, embeddings and everywhere invariance with applications to general relativity. The approach is entirely geometric with particular emphasis on the use of natural structures. A clear indication of the interaction between the above topics is given; …
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