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Spin Structure Functions Of The Deuteron Measured With Clas In And Above The Resonance Region
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Book Synopsis Spin Structure Functions of the Deuteron Measured with Clas in and Above the Resonance Region by : Kahanawita G. Vipuli G. Dharmawardane
Download or read book Spin Structure Functions of the Deuteron Measured with Clas in and Above the Resonance Region written by Kahanawita G. Vipuli G. Dharmawardane and published by . This book was released on 2004 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spin Structure Functions of the Deuteron Measured with CLAS in and Above the Resonance Region by :
Download or read book Spin Structure Functions of the Deuteron Measured with CLAS in and Above the Resonance Region written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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, [Gamma]1, 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 for deuterium as part of the ''EG1'' run group in Jefferson Lab's Hall B. We used a highly polarized electron beam with energies from 1.6 GeV to 5.7 GeV and a cryogenic polarized ND3 target together with the CEBAF Large Acceptance Spectrometer (CLAS) to accumulate over 11 billion events. In this thesis, we present results for the spin structure function g1{sup d} (x, Q2), as well as its first moment, [Gamma]1{sup d}(Q2) in and above the resonance region over a Q2 range from 0.05 to 5 Gev2, based on the data taken with beam energies of 1.6 and 5.7 GeV. We also extract the behavior of A1{sup d}(x) at large x. Our data are consistent with the Hyperfine-perturbed quark model calculation which predicts that A1{sup d} (x 2!1) 2!1. We also see evidence for duality in g1{sup d} (x, Q2) at Q2> GeV2.
Book Synopsis Spin Structure of the Deuteron by : Nevzat Guler
Download or read book Spin Structure of the Deuteron written by Nevzat Guler and published by LAP Lambert Academic Publishing. This book was released on 2013-01 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: The physics program with CLAS at Jefferson Lab has collected a large amount of data on the spin structure functions of the nucleon by using polarized electron beam directed on polarized NH3 and ND3 targets. In these experiments, the virtual photon asymmetry and the spin structure functions were measured with an unprecedented precision in a large kinematic range. The data help us to better understand the spin structure of the nucleon, especially in the transition region between hadronic and quark-gluon degrees of freedom. Therefore, it will be possible to put limits on quark-hadron duality, test pQCD predictions for the quark polarization at large Bjorken x, perform more precise calculations of higher-twist matrix elements in the framework of the Operator Product Expansion and get a glimpse of A1 at high x. In addition, using available proton and deuteron data together and utilizing a new unfolding technique, the spin structure functions for the neutron in the resonance region are extracted.
Book Synopsis Measurement of Inclusive Spin Structure Functions of the Deuteron with CLAS. by :
Download or read book Measurement of Inclusive Spin Structure Functions of the Deuteron with CLAS. written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report the results of a new measurement of spin structure functions of the deuteron in the region of moderate momentum transfer (Q2 = 0.27 -- 1.3 (GeV/c)2) and final hadronic state mass in the nucleon resonance region (W = 1.08 -- 2.0 GeV). We scattered a 2.5 GeV polarized continuous electron beam at Jefferson Lab off a dynamically polarized cryogenic solid state target (15ND3) and detected the scattered electrons with the CEBAF Large Acceptance Spectrometer (CLAS). From our data, we extract the longitudinal double spin asymmetry A{sub {parallel}} and the spin structure function g1{sup d}. Our data are generally in reasonable agreement with existing data from SLAC where they overlap, and they represent a substantial improvement in statistical precision. We compare our results with expectations for resonance asymmetries and extrapolated deep inelastic scaling results. Finally, we evaluate the first moment of the structure function g1{sup d} and study its approach to both the deep inelastic limit at large Q2 and to the Gerasimov-Drell-Hearn sum rule at the real photon limit (Q2−°. We find that the first moment varies rapidly in the Q2 range of our experiment and crosses zero at Q2 between 0.5 and 0.8 (GeV/c)2, indicating the importance of the [Delta] resonance at these momentum transfers.
Book Synopsis Proton and Neutron Spin Structure Functions in and Near the Resonance Region by :
Download or read book Proton and Neutron Spin Structure Functions in and Near the Resonance Region written by and published by . This book was released on 2004 with total page 52303 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present an overview of the measurements for polarized electron scattering from polarized NH_3, ND_3, and ^3He targets at JLab. All three experimental halls are involved in this program. The data span a range in Q^2 up to about 3.5 GeV^2 and a range in the gamma*N invariant mass W up to 3.5 GeV. The photon absorption function A_1 and the spin structure function g1 for the proton and deuteron have been extracted from data obtained with the CLAS spectrometer. The photon absorption functions, A_1 and A_2, and the spin structure functions g_1 and g_2 for ^3He have been obtained from Hall A data.
Book Synopsis Spin Structure of the Nucleon by : Erhard Steffens
Download or read book Spin Structure of the Nucleon written by Erhard Steffens and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive survey of the most recent results from the field of quark-gluon structure of the nucleon, in particular how the spin of the nucleon is shared by its constituents. After very intriguing results from CERN and SLAC at the end of the 1980s, the last decade has seen a set of second-generation experiments at high energy accelerators that have yielded precise information on the solution of the 'Spin Crisis' - as well as opening up new questions. The articles are written by experts from the leading collaboration and theory groups as well as providing an expert summary of the state of the art, the book points the way to future research directions. Its main focus is on semi-inclusive and exclusive measurements of deep inelastic lepton scattering, which enables for the first time the determination of the flavor-separated quark spin distributions. Future developments on generalized parton distributions and their interpretation as well as the transverse spin structure are also covered. An indispensable volume for all working in hadronic physics.
Book Synopsis Spin Structure Functions of the Deuteron by : Junho Yun
Download or read book Spin Structure Functions of the Deuteron written by Junho Yun and published by . This book was released on 2002 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of Spin Structure Function G1 for the Proton and Deuteron in the Resonance Region by : Paul Edgar Raines
Download or read book Measurement of Spin Structure Function G1 for the Proton and Deuteron in the Resonance Region written by Paul Edgar Raines and published by . This book was released on 1996 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of Spin Structure Function G(1) for Proton and Deuteron in the Resonance Region by :
Download or read book Measurement of Spin Structure Function G(1) for Proton and Deuteron in the Resonance Region written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiment E143 at SLAC measured the proton and deuteron spin structure functions g[sub 1][sup p], g[sub 2][sup p], g[sub 1][sup d] and g[sub 2][sup d] using polarized electrons at beam energies of 29, 16, and 9.7 GeV incident on polarized [sup 15]NHY[sub 3] and [sup 15]ND[sub 3] targets. Two spectrometers detected the scattered electrons at the angles 4.5[sup o] and 7.0[sup o], covering a kinematic range of x> 0.03 and 0.3
Book Synopsis Inclusive and Exclusive Spin Structure Measurements in the Resonance Region by : G. E. Dodge
Download or read book Inclusive and Exclusive Spin Structure Measurements in the Resonance Region written by G. E. Dodge and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A program of spin structure function measurements is underway in Jefferson Lab's Hall B. We use polarized electrons incident on polarized NH3 and ND3 targets to study proton and deuteron spin observables in and above the resonance region. Results from the first set of data taken in 1998 will be presented for the first moment of g1 and for the double polarization asymmetry for exclusive pion production, which is sensitive to the spin structure of the nucleon resonances.
Book Synopsis Gdh 2000 - The Gerasimov-drell-hearn Sum Rule & The Nucleon Spin Structure In The Resonance Region by : Dieter Drechsel
Download or read book Gdh 2000 - The Gerasimov-drell-hearn Sum Rule & The Nucleon Spin Structure In The Resonance Region written by Dieter Drechsel and published by World Scientific. This book was released on 2001-02-05 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Precise Determination of the Deuteron Spin Structure at Low to Moderate [math][msup][mi]Q[/mi][mn]2[/mn][/msup][/math] with CLAS and Extraction of the Neutron Contribution by :
Download or read book Precise Determination of the Deuteron Spin Structure at Low to Moderate [math][msup][mi]Q[/mi][mn]2[/mn][/msup][/math] with CLAS and Extraction of the Neutron Contribution written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, we present the final results for the deuteron spin structure functions obtained from the full data set collected with Jefferson Lab's CLAS in 2000-2001. Polarized electrons with energies of 1.6, 2.5, 4.2 and 5.8 GeV were scattered from deuteron (15ND3) targets, dynamically polarized along the beam direction, and detected with CLAS. From the measured double spin asymmetry, the virtual photon absorption asymmetry Ad1 and the polarized structure function gd1 were extracted over a wide kinematic range (0.05 GeV2
Book Synopsis Measurement of the Spin Structure Function G1(x, Q2) of the Proton in the Resonance Region by : Yelena Alexandrovna Prok
Download or read book Measurement of the Spin Structure Function G1(x, Q2) of the Proton in the Resonance Region written by Yelena Alexandrovna Prok and published by . This book was released on 2004 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spin Structure Functions written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A large program of spin structure measurements is underway in Jefferson Lab's Hall B. Of particular interest is the first moment of the spin structure function g1, which 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. One can then study the transition from hadronic to quark degrees of freedom over the whole range of Q2. It is also interesting to look for the onset of quark-hadron duality in spin structure functions. We use longitudinally polarized electrons with energies from 1.6 to 5.7 GeV incident upon polarized NH3 and ND3 targets to investigate proton and deuteron spin observables in and above the resonance region. We present the GDH and Bjorken integrals using the 1.6 and 5.7 GeV data and comment on the validity of local quark-hadron duality over the wide kinematical range (0.05? Q2? 4.5 GeV2 and W
Book Synopsis Measurement of Spin Structure Functions at Moderate Q{sup 2} Using CLAS. by : Volker Burkert
Download or read book Measurement of Spin Structure Functions at Moderate Q{sup 2} Using CLAS. written by Volker Burkert and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Spin structure functions of the nucleon in the region of large z and small to moderate Q{sup 2} continue to be of high current interest. Among the topics one can study in this kinematic regime are spin-dependent resonance transition amplitudes and their interference with each other and the non-resonant background, the behavior of the asymmetry A{sub 1} at large x, and the presence or absence of local duality in spin structure functions. The first moment of the spin structure function g{sub 1} goes through a rapid transition from the photon point (Q{sup 2} = 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. This opens up the possibility to study the transition from hadronic to quark degrees of freedom over the whole range of Q{sup 2}. Recently, we concluded a large experimental program to measure these observables with polarized proton and deuteron targets at Jefferson Lab. A highly polarized electron beam, solid polarized NH{sub 3} and ND{sub 3} targets and the CEBAF Large Acceptance Spectrometer (CLAS) in Hall B were used to accumulate over 23 billion events with 4 different beam energies of 1.6, 2.5, 4.2 and 5.7 GeV. We present an overview of the experiment, its kinematic coverage and its statistical power. We show final results from the first run at 2.5 GeV and 4 GeV and preliminary results from the 5.7 GeV and the 1.6 GeV data sets.
Book Synopsis The First Moment of G1 Measured with the CLAS Detector by : G. E. Dodge
Download or read book The First Moment of G1 Measured with the CLAS Detector written by G. E. Dodge and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A large program of spin structure function measurements is underway in Jefferson Lab's Hall B. Of particular interest is the first moment of the spin structure function g1, which 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. One can then study the transition from hadronic to quark degrees of freedom over the whole range of Q2. We use polarized electrons incident on polarized NH3 and ND3 targets to study proton and deuteron spin observables in and above the resonance region. Using the Cebaf Large Acceptance Spectrometer (CLAS) and beam energies of 1.6, 2.4, 4.2 and 5.7 GeV, we are able to cover a wide kinematic range: 0.05 GeV2
Book Synopsis The Spin Structure of the Proton in the Resonance Region by :
Download or read book The Spin Structure of the Proton in the Resonance Region written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Inclusive double spin asymmetries have been measured for $\vec{p}$($\vec{e}$,e') using the CLAS detector and a polarized 15NH3 target at Jefferson Lab in 1998. The virtual photon asymmetry A1, the longitudinal spin structure function, g1 (x, Q2), and the first moment [Gamma]$1\atop{p}$, have been extracted for a Q2 range of 0.15-2.0 GeV2. These results provide insight into the low Q2 evolution of spin dependent asymmetries and structure functions as well as the transition of [Gamma]$1\atop{p}$ from the photon point, where the Gerasimov, Drell and Hearn Sum Rule is expected to be satisfied, to the deep inelastic region.
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