Spin Structure Functions of the Deuteron Measured with Clas in and Above the Resonance Region PDF Download
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Author: Kahanawita G. Vipuli G. Dharmawardane
Publisher:
ISBN:
Category : Lepton-nucleon scattering
Languages : en
Pages : 382
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Book Description
Author: Kahanawita G. Vipuli G. Dharmawardane
Publisher:
ISBN:
Category : Lepton-nucleon scattering
Languages : en
Pages : 382
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
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.
Author: Nevzat Guler
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659301766
Category :
Languages : en
Pages : 436
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Book Description
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.
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Category :
Languages : en
Pages :
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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.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 52303
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Book Description
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.
Author: Erhard Steffens
Publisher: Springer Science & Business Media
ISBN: 9401001650
Category : Science
Languages : en
Pages : 273
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Book Description
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.
Author: Junho Yun
Publisher:
ISBN:
Category : Deuterons
Languages : en
Pages : 212
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Author: Paul Edgar Raines
Publisher:
ISBN:
Category :
Languages : en
Pages : 207
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Author:
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ISBN:
Category :
Languages : en
Pages :
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Book Description
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
Author: G. E. Dodge
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
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.
