An Overview Of Longitudinal Spin Structure Measurements From Jlab PDF Download
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| Release | : 2013 |
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Download An Overview of Longitudinal Spin Structure Measurements from JLab Book in PDF, ePub and Kindle
Jefferson Lab is currently one of the facilities leading the investigation of the spin structure of the nucleon. Over the past 15 years, several high precision measurements have been completed, extending our knowledge of the polarized structure functions g1 and g2 down to Q2 = 0.02 GeV2. In particular, the low-Q2 range (≤ 0.1 GeV2) from these data allows us to make a benchmark-check of Chiral Perturbation theory ([chi]PT). Previous results for the moments of the spin structure functions in this region have shown mixed agreement. For [Gamma]1, the first moment of g1, we find good consistency between data and theory. However, we have seen a surprisingly large discrepancy with [chi]PT calculations for the [delta]{sub LT} spin polarizability on the neutron, which is significantly less sensitive to the [Delta]-resonance contribution. These proceedings will discuss the recent experimental effort at low Q2 from Jefferson Lab, including a discussion of preliminary results on the neutron. The new results on the neutron still show a sizeable discrepancy between data and theory. However, new calculations show improved agreement with data for some observables. In addition, new proton data for g2 is also expected to help resolve the disagreement for [delta]{sub LT}.
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| Release | : 2007 |
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Download The Resonance Spin Structure Measurement at Hall-C and the Future JLab Physics Program Book in PDF, ePub and Kindle
We discuss the preliminary results of the Resonant Spin Structure experiment and outline a future spin-dependent measurement in JLab's experimental Hall C.
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| Release | : 2012 |
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Download Spin Structure with JLab 6 and 12 GeV. Book in PDF, ePub and Kindle
Highlights of JLab 6 GeV results on spin structure study and plan for 12 GeV program. Spin structure study is full of surprises and puzzles. A decade of experiments from JLab yield these exciting results: (1) valence spin structure; (2) precision measurements of g2/d2 - high-twist; (3) spin sum rules and polarizabilities; and (4) first neutron transversity. There is a bright future as the 12 GeV Upgrade will greatly enhance our capability: (1) Precision determination of the valence quark spin structure flavor separation; (2) Precision measurements of g2/d2; and (3) Precision extraction of transversity/tensor charge.
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| Release | : 2011 |
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Download Nucleon Spin Structure Book in PDF, ePub and Kindle
Inclusive Deep-Inelastic Scattering (DIS) experiments have provided us with the most extensive information on the unpolarized and longitudinal polarized parton (quark and gluon) distributions in the nucleon. It has becoming clear that transverse spin and transverse momentum dependent distributions (TMDs) study are crucial for a more complete understanding of the nucleon structure and the dynamics of the strong interaction. The transverse spin structure and the TMDs are the subject of increasingly intense theoretical and experimental study recently. With a high luminosity electron beam facility, JLab has played a major role in the worldwide effort to study both the longitudinal and transverse spin structure. Highlights of recent results will be presented. With 12-GeV energy upgrade, JLab will provide the most precise measurements in the valence quark region to close a chapter in longitudinal spin study. JLab will also perform a multi-dimensional mapping of the transverse spin structure and TMDs in the valence quark region through Semi-Inclusive DIS (SIDIS) experiments, providing a 3-d partonic picture of the nucleon in momentum space and extracting the u and d quark tensor charges of the nucleon. The precision mapping of TMDs will also allow a detailed study of the quark orbital motion and its dynamics.
| Author | : Dieter Drechsel |
| Publisher | : World Scientific |
| Total Pages | : 430 |
| Release | : 2001-02-05 |
| Genre | : Science |
| ISBN | : 9814491381 |
Download Gdh 2000 - The Gerasimov-drell-hearn Sum Rule & The Nucleon Spin Structure In The Resonance Region Book in PDF, ePub and Kindle
The history of spin in general, and of the nucleon spin structure in particular, has been full of surprises. For the past 25 years deep inelastic lepton scattering has been studied to determine the carriers of the nucleon spin. However, it was realized only recently that a full understanding of the nucleon spin will also require detailed information on the helicity structure in the resonance region, i.e. in the realm of nonperturbative QCD.This volume gives a status report on the spin structure in the nucleon resonance region, focusing on: new experimental results from SLAC and HERMES; a first glance at the JLab experiments to map out the spin structure functions at low and intermediate four-momentum transfers; the pioneering experiment at MAMI (Mainz) to determine the Gerasimov-Drell-Hearn sum rule for real photons; and recent theoretical concepts and investigations to describe the spin structure in the frameworks of higher twist expansion, phenomenological models and chiral perturbation theory.
| Author | : D. Drechsel |
| Publisher | : World Scientific |
| Total Pages | : 432 |
| Release | : 2001 |
| Genre | : Science |
| ISBN | : 9789810245740 |
Download GDH 2000 Book in PDF, ePub and Kindle
The history of spin in general, and of the nucleon spin structure in particular, has been full of surprises. For the past 25 years deep inelastic lepton scattering has been studied to determine the carriers of the nucleon spin. However, it was realized only recently that a full understanding of the nucleon spin will also require detailed information on the helicity structure in the resonance region, i.e. in the realm of nonperturbative QCD.This volume gives a status report on the spin structure in the nucleon resonance region, focusing on: new experimental results from SLAC and HERMES; a first glance at the JLab experiments to map out the spin structure functions at low and intermediate four-momentum transfers; the pioneering experiment at MAMI (Mainz) to determine the Gerasimov-Drell-Hearn sum rule for real photons; and recent theoretical concepts and investigations to describe the spin structure in the frameworks of higher twist expansion, phenomenological models and chiral perturbation theory.
| Author | : Jian-Ping Chen |
| Publisher | : AIP Conference Proceedings (Nu |
| Total Pages | : 196 |
| Release | : 2009-08-04 |
| Genre | : Science |
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Download Spin Structure at Long Distance Book in PDF, ePub and Kindle
Theoretical developments -- Experimental developments -- Future experiments and active analyses.
| Author | : Ian Brock |
| Publisher | : John Wiley & Sons |
| Total Pages | : 437 |
| Release | : 2011-05-04 |
| Genre | : Science |
| ISBN | : 3527634975 |
Download Physics at the Terascale Book in PDF, ePub and Kindle
Written by authors working at the forefront of research, this accessible treatment presents the current status of the field of collider-based particle physics at the highest energies available, as well as recent results and experimental techniques. It is clearly divided into three sections; The first covers the physics -- discussing the various aspects of the Standard Model as well as its extensions, explaining important experimental results and highlighting the expectations from the Large Hadron Collider (LHC). The second is dedicated to the involved technologies and detector concepts, and the third covers the important - but often neglected - topics of the organisation and financing of high-energy physics research. A useful resource for students and researchers from high-energy physics.
| Author | : Marco Anghinolfi |
| Publisher | : World Scientific |
| Total Pages | : 447 |
| Release | : 2003 |
| Genre | : Science |
| ISBN | : 9812383972 |
Download GDH 2002 Book in PDF, ePub and Kindle
This volume contains the proceedings of the GDH 2002 symposium. It is a review of the most recent results on the nucleon spin structure and related sum rules using real and virtual photons. The latest theoretical developments and the new high precision data from different laboratories are presented and discussed. The book provides a comprehensive picture of the nucleon spin studies from the perturbative domain down to the resonance and low momentum transfer region.
| Author | : Steven A. Dytman |
| Publisher | : World Scientific |
| Total Pages | : 413 |
| Release | : 2003 |
| Genre | : Science |
| ISBN | : 9812705171 |
Download NSTAR 2002 Book in PDF, ePub and Kindle
This book covers recent advances in the physics of nucleon resonances, including new experimental results from laboratories in the USA, Europe, and Asia, and new developments in effective field theories, quark models, and lattice gauge theory.
