Measurement Of The Target Normal Single Spin Asymmetry In Quasielastic Scattering From The Reaction Math Display PDF Download
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Release | : 2015 |
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Download Measurement of the Target-normal Single-spin Asymmetry in Quasielastic Scattering from the Reaction [math Display Book in PDF, ePub and Kindle
We report the first measurement of the target single-spin asymmetry, Ay, in quasi-elastic scattering from the inclusive reaction 3He1!(e, e') on a 3He gas target polarized normal to the lepton scattering plane. Assuming time-reversal invariance, this asymmetry is strictly zero for one-photon exchange. A non-zero Ay can arise from the interference between the one- and two-photon exchange processes which is sensitive to the details of the sub-structure of the nucleon. An experiment recently completed at Jefferson Lab yielded asymmetries with high statistical precision at Q2= 0.13, 0.46 and 0.97 GeV2. These measurements demonstrate, for the first time, that the 3He asymmetry is clearly non-zero and negative with a statistical significance of (8-10)[sigma]. Using measured proton-to-3He cross-section ratios and the effective polarization approximation, neutron asymmetries of -(1-3)% were obtained. The neutron asymmetry at high Q2 is related to moments of the Generalized Parton Distributions (GPDs). Our measured neutron asymmetry at Q2=0.97 GeV2 agrees well with a prediction based on two-photon exchange using a GPD model and in addition provides a new independent constraint on these distributions.
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Release | : 2015 |
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Download Measurement of the Target-normal Single-spin Asymmetry in Quasielastic Scattering from the Reaction He3{u2191}(e,e'). Book in PDF, ePub and Kindle
We report the first measurement of the target single-spin asymmetry, Ay, in quasi-elastic scattering from the inclusive reaction 3He↑ (e,e') on a 3He gas target polarized normal to the lepton scattering plane. Assuming time-reversal invariance, this asymmetry is strictly zero for one-photon exchange. A non-zero Ay can arise from the interference between the one- and two-photon exchange processes which is sensitive to the details of the sub-structure of the nucleon. An experiment recently completed at Jefferson Lab yielded asymmetries with high statistical precision at Q2= 0.13, 0.46 and 0.97 GeV2. These measurements demonstrate, for the first time, that the 3He asymmetry is clearly non-zero and negative with a statistical significance of (8-10)?. Using measured proton-to-3He cross-section ratios and the effective polarization approximation, neutron asymmetries of -(1-3)% were obtained. The neutron asymmetry at high Q2 is related to moments of the Generalized Parton Distributions (GPDs). Our measured neutron asymmetry at Q2=0.97 GeV2 agrees well with a prediction based on two-photon exchange using a GPD model and in addition provides a new independent constraint on these distributions.
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Release | : 2014 |
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Download Measurement of the Target-Normal Single-Spin Asymmetry in Deep-Inelastic Scattering from the Reaction 3He{uparrow}(e, E')X. Book in PDF, ePub and Kindle
We report the first measurement of the target single-spin asymmetry in deep-inelastic scattering from the inclusive reaction 3He{uparrow}(e, e')X on a 3He gas target polarized normal to the lepton plane. Assuming time-reversal invariance, this asymmetry is strictly zero in the Born approximation. The experiment, conducted at Jefferson Lab using a 5.89 GeV electron beam, covers a range of 1.7W
Author | : Joseph M. Katich |
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Total Pages | : 384 |
Release | : 2011 |
Genre | : Electrons |
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Download Measurement of the Target-normal Single-spin Asymmetry A[superscript N Over Subscript Y] in the Deep Inelastic Region from the Reaction 3He[up Arrow](e,eʹ) Book in PDF, ePub and Kindle
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Download Single and Double Spin Asymmetries for Deeply Virtual Compton Scattering Measured with CLAS and a Longitudinally Polarized Proton Target Book in PDF, ePub and Kindle
Single-beam, single-target, and double-spin asymmetries for hard exclusive photon production on the proton e→p→e'p'[gamma] are presented. The data were taken at Jefferson Lab using the CLAS detector and a longitudinally polarized 14NH3 target. The three asymmetries were measured in 165 4-dimensional kinematic bins, covering the widest kinematic range ever explored simultaneously for beam and target-polarization observables in the valence quark region. The kinematic dependences of the obtained asymmetries are discussed and compared to the predictions of models of Generalized Parton Distributions. As a result, the measurement of three DVCS spin observables at the same kinematic points allows a quasi-model-independent extraction of the imaginary parts of the H and H~ Compton Form Factors, which give insight into the electric and axial charge distributions of valence quarks in the proton.
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Total Pages | : 5 |
Release | : 2004 |
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Download Single Spin Asymmetries in Semi-inclusive Deep Inelastic Scattering on a Transversely Polarized Hydrogen Target Book in PDF, ePub and Kindle
Author | : Robert Evans Donaldson |
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Total Pages | : 40 |
Release | : 1956 |
Genre | : Neutrons |
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Download Detection of Azimuthal Asymmetry in Quasi-elastic Double-scattering Experiments Book in PDF, ePub and Kindle
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Total Pages | : 6 |
Release | : 2005 |
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Download Subleading-twist Effects in Single-spin Asymmetries in Semi-inclusive Deep-inelastic Scattering on a Longitudinally Polarized Hydrogen Target Book in PDF, ePub and Kindle
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Release | : 2006 |
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Download Azimuthal and Single Spin Asymmetry in Deep-inelasticlepton-nucleon Scattering Book in PDF, ePub and Kindle
The collinear expansion technique is generalized to thefactorization of unintegrated parton distributions and other higher twistparton correlations from the corresponding collinear hard parts thatinvolve multiple parton final state interaction. Such a generalizedfactorization provides a consistent approach to the calculation ofinclusive and semi-inclusive cross sections of deep-inelasticlepton-nucleon scattering. As an example, the azimuthal asymmetry iscalculated to the order of 1/Q in semi-inclusive deeply inelasticlepton-nucleon scattering with transversely polarized target. Anon-vanishing single-spin asymmetry in the "triggered inclusive process"is predicted to be 1/Q suppressed with a part of the coefficient relatedto a moment of the Sivers function.
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Total Pages | : 1808 |
Release | : 1979 |
Genre | : Nuclear energy |
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