Measurement of the Single Spin Asymmetry and Polarized Structure Function Sigma(Lt') in the Exclusive P(e(pol), E' K+)lambda Reaction PDF Download
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Author: B. A. Raue Publisher: ISBN: Category : Languages : en Pages :
Book Description
The single spin beam asymmetry, A{sub LT'}, and the polarized structure function, {sigma}{sub LT'}, for the p({rvec e}, e'K{sup +}){Lambda} reaction in the resonance region have been measured and extracted using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. Data were taken at an electron beam energy of 2.57 GeV. The large acceptance of CLAS allows for full azimuthal angle coverage over a large range of kaon center-of-mass angles. Preliminary results are presented that span a range in Q{sup 2} from 0.4 to 1.4 (GeV){sup 2} and in W from threshold up to 2.1 GeV. Comparison to existing theoretical calculations are also presented. The fifth structure function is sensitive to the interferences between resonant and non-resonant amplitudes. This measurement is part of a larger CLAS program to measure cross sections and polarization observables for kaon electroproduction in the nucleon resonance region.
Author: B. A. Raue Publisher: ISBN: Category : Languages : en Pages :
Book Description
The single spin beam asymmetry, A{sub LT'}, and the polarized structure function, {sigma}{sub LT'}, for the p({rvec e}, e'K{sup +}){Lambda} reaction in the resonance region have been measured and extracted using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. Data were taken at an electron beam energy of 2.57 GeV. The large acceptance of CLAS allows for full azimuthal angle coverage over a large range of kaon center-of-mass angles. Preliminary results are presented that span a range in Q{sup 2} from 0.4 to 1.4 (GeV){sup 2} and in W from threshold up to 2.1 GeV. Comparison to existing theoretical calculations are also presented. The fifth structure function is sensitive to the interferences between resonant and non-resonant amplitudes. This measurement is part of a larger CLAS program to measure cross sections and polarization observables for kaon electroproduction in the nucleon resonance region.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The single spin beam asymmetry, ALTÃ?Â?Ã?Â?Ã?Â?Ã?Â[cent]Ã?Â?Ã?Â?Ã?Â?Ã?Â?Ã?Â?Ã?Â?Ã?Â?Ã?Â2, and the polarized structure function, Ã?Â?Ã?Â?Ã?Â?Ã?Â[8F]Ã?Â?Ã?Â?Ã?Â?Ã?Â?LTÃ?Â?Ã?Â?Ã?Â?Ã?Â[cent]Ã?Â?Ã?Â?Ã?Â?Ã?Â?Ã?Â?Ã?Â?Ã?Â?Ã?Â2, for the reaction in the resonance region have been measured and extracted using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. Data were taken at an electron beam energy of 2.57 GeV. The large acceptance of CLAS allows for full azimuthal angle coverage over a large range of kaon center-of-mass angles. Preliminary results are presented that span a range in Q2 from 0.4 to 1.4 (GeV)2 and in W from threshold up to 2.1 GeV. Comparison to existing theoretical calculations are also presented. The fifth structure function is sensitive to the interferences between resonant and non-resonant amplitudes. This measurement is part of a larger CLAS program to measure cross sections and polarization observables for kaon electroproduction in the nucleon resonance region.
Author: Publisher: ISBN: Category : Languages : en Pages : 220
Book Description
The single spin asymmetry, ALT', and the polarized structure function, ?LT', for the p($\vec{e}$, e' K+) reaction in the resonance region have been measured and extracted using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. Data were taken at an electron beam energy of 2.567 GeV. The large acceptance of CLAS allows for full azimuthal angle coverage over a large range of center-of-mass scattering angles. Results were obtained that span a range in Q2 from 0.5 to 1.3 GeV2 and W from threshold up to 2.1 GeV and were compared to existing theoretical calculations. The polarized structure function is sensitive to the interferences between various resonant amplitudes, as well as to resonant and non-resonant amplitudes. This measurement is essential for understanding the structure of nucleons and searching for previously undetected nucleon excited states (resonances) predicted by quark models. The W dependence of the ?LT' in the kinematic regions dominated by s and u channel exchange (cos ?$cm\atop{k}$ = -0.50, -0.167, 0.167) indicated possible resonance structures not predicted by theoretical calculations. The ?LT' behavior around W = 1.875 GeV could be the signature of a resonance predicted by the quark models and possibly seen in photoproduction. In the very forward angles where the reaction is dominated by the t-channel, the average ?LT' was zero. There was no indication of the interference between resonances or resonant and non-resonant amplitudes. This might be indicating the dominance of a single t-channel exchange. Study of the sensitivity of the fifth structure function data to the resonance around 1900 MeV showed that these data were highly sensitive to the various assumptions of the models for the quantum number of this resonance. This project was part of a larger CLAS program to measure cross sections and polarization observables for kaon electroproduction in the nucleon resonance region.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The target and double spin asymmetry measurements of exclusive p0 electroproduction were performed for the first time in DIS region at Jefferson Lab using the CEBAF Large Acceptance Spectrometer (CLAS) and longitudinally polarized proton target. The wide kinematic coverage and good resolution of CLAS allowed measurements in full azimuthal range providing an opportunity to extract single and double spin asymmetries proportional to polarized structure functions. Their angular dependencies in hadronic center-of-mass system were analyzed, and extracted moments are compared to recent theoretical handbag-based calculations based on chiral-even and chiral-odd GPDs contributions. The interpretation of present results within the framework of the modified perturbative approach and their use as a constraint for models of the t behavior will be discussed.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The polarized longitudinal-transverse structure function [sigma]{sub LT'} has been measured for the first time in the [Delta](1232) resonance region at Q2 = 0.40 and 0.65 GeV2. Data for the p{rvec e}, e'p [pi]° reaction were taken at Jefferson Lab with the CEBAF Large Acceptance Spectrometer (CLAS) using longitudinally polarized electrons at an energy of 1.515 GeV. Evidence for interference between resonant and non-resonant amplitudes is discussed using a partial wave analysis. Comparison with previous beam asymmetry measurements at MAMI indicate a deviation from the predicted Q2 dependence of [sigma]{sub LT'} using recent phenomenological models.
Author: B. A. Raue
Author: B. A. Raue
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