2026-09-19T22:19:59Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/532342022-01-13T07:54:41Zcom_1721.1_7582com_1721.1_7581col_1721.1_131022
William Bertozzi.
Xiao, Yuan, Ph. D., 1974-
Massachusetts Institute of Technology. Dept. of Physics.
Massachusetts Institute of Technology. Department of Physics
2010-03-25T15:18:44Z
2010-03-25T15:18:44Z
2009
2009
http://hdl.handle.net/1721.1/53234
535616266
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2009.
In title on title page, "[delta] appear as upper case Greek letter. Cataloged from PDF version of thesis.
Includes bibliographical references (p. 161-165).
This work studies two double polarized pion electroproduction reactions 1(e', e'p)o0 and H(e', e'r+)n near the A region at the MIT-Bates Linear Accelerator Center. With the Bates Large Acceptance Spectrometer Toroid (BLAST) detector package, data were collected simultaneously for both reaction channels, covering an invariant mass range of 1.1 to 1.4 GeV and a squared four momentum transfer range of 0.1 to 0.4 (GeV/c)2. By flipping the target spin direction and the electron beam helicity, the single- (beam only and target only) and double-spin (beam-target) asymmetries were constructed from the measured yields with different spin combinations, covering two kinematic setups: longitudinal and transverse target spin orientations (with respect to the three momentum transfer direction). With a non-zero target spin angle (with respect to the beam direction), this experiment reports for the first time the full angular dependence of asymmetries, compared with theoretical predictions by several pion production models. In some kinematic bins, signs of preference of data to a specific model have been seen, and hints of systematic deviation of data from models have also been observed. Thus, the necessity of new constraints to the pion production models is indicated by this work.
by Yuan Xiao.
Ph.D.
357 p.
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by
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http://dspace.mit.edu/handle/1721.1/7582
Physics.
A study of the spin dependence of pion electroproduction near the [delta] region
Study of the spin dependence of pion electroproduction near the [delta]-excitation region
Thesis
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<Abstract>This work studies two double polarized pion electroproduction reactions 1(e', e'p)o0 and H(e', e'r+)n near the A region at the MIT-Bates Linear Accelerator Center. With the Bates Large Acceptance Spectrometer Toroid (BLAST) detector package, data were collected simultaneously for both reaction channels, covering an invariant mass range of 1.1 to 1.4 GeV and a squared four momentum transfer range of 0.1 to 0.4 (GeV/c)2. By flipping the target spin direction and the electron beam helicity, the single- (beam only and target only) and double-spin (beam-target) asymmetries were constructed from the measured yields with different spin combinations, covering two kinematic setups: longitudinal and transverse target spin orientations (with respect to the three momentum transfer direction). With a non-zero target spin angle (with respect to the beam direction), this experiment reports for the first time the full angular dependence of asymmetries, compared with theoretical predictions by several pion production models. In some kinematic bins, signs of preference of data to a specific model have been seen, and hints of systematic deviation of data from models have also been observed. Thus, the necessity of new constraints to the pion production models is indicated by this work.</Abstract>
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