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EG1

Spokespersons
P. Stoler, V. Burkert, R. Minehart
Year
2000
Abstract
An extensive experimental program to measure the spin structure of the nucleons is carried out in Hall B with the CLAS detector at Jefferson Lab using a polarized electron beam incident on a polarized target. Spin degrees of freedom offer the possibility to test, in an independent way, existing models of resonance electroproduction. The most accessible resonance is the Delta(1232) since it does not overlap with other states and decays strongly via pi emission. The present analysis selects the Delta(1232) and the higher W region in the exclusive channel vec p(vec e,e',p)pi0 from data taken in 2000-2001, to extract single and double asymmetries in a Q2 range from 0.2 to 0.75 GeV2. Results of the asymmetries will be presented as a function of the center of mass decay angles of the pi0.
Publication
  1. A. S. Biselli, V. D. Burkert, and CLAS Collaboration First measurement of target and double spin asymmetries for polarized e- polarized p → e p π0 in the nucleon resonance region above the Δ(1232) // PRC 78, 045204 (2008)
Quantities
Aet   At

Measurements

ID Quantity Beam Target Final state Q2min,
GeV2 		Q2max,
GeV2 		Wmin,
GeV 		Wmax,
GeV
E40M1 Aet e p π0p 0.187 0.317 1.1 1.15
E40M2 Aet e p π0p 0.187 0.317 1.15 1.2
E40M3 Aet e p π0p 0.187 0.317 1.2 1.25
E40M4 Aet e p π0p 0.187 0.317 1.25 1.3
E40M5 Aet e p π0p 0.187 0.317 1.3 1.4
E40M6 Aet e p π0p 0.187 0.317 1.4 1.5
E40M7 Aet e p π0p 0.187 0.317 1.5 1.6
E40M8 Aet e p π0p 0.187 0.317 1.6 1.7
E40M9 Aet e p π0p 0.317 0.452 1.1 1.15
E40M10 Aet e p π0p 0.317 0.452 1.15 1.2
E40M11 Aet e p π0p 0.317 0.452 1.2 1.25
E40M12 Aet e p π0p 0.317 0.452 1.25 1.3
E40M13 Aet e p π0p 0.317 0.452 1.3 1.4
E40M14 Aet e p π0p 0.317 0.452 1.4 1.5
E40M15 Aet e p π0p 0.317 0.452 1.5 1.6
E40M16 Aet e p π0p 0.317 0.452 1.6 1.7
E40M17 Aet e p π0p 0.452 0.77 1.1 1.15
E40M18 Aet e p π0p 0.452 0.77 1.15 1.2
E40M19 Aet e p π0p 0.452 0.77 1.2 1.25
E40M20 Aet e p π0p 0.452 0.77 1.25 1.3
E40M21 Aet e p π0p 0.452 0.77 1.3 1.4
E40M22 Aet e p π0p 0.452 0.77 1.4 1.5
E40M23 Aet e p π0p 0.452 0.77 1.5 1.6
E40M24 At e p π0p 0.187 0.317 1.1 1.15
E40M25 At e p π0p 0.187 0.317 1.15 1.2
E40M26 At e p π0p 0.187 0.317 1.2 1.25
E40M27 At e p π0p 0.187 0.317 1.25 1.3
E40M28 At e p π0p 0.187 0.317 1.3 1.4
E40M29 At e p π0p 0.187 0.317 1.4 1.5
E40M30 At e p π0p 0.187 0.317 1.5 1.6
E40M31 At e p π0p 0.187 0.317 1.6 1.7
E40M32 At e p π0p 0.317 0.452 1.1 1.15
E40M33 At e p π0p 0.317 0.452 1.15 1.2
E40M34 At e p π0p 0.317 0.452 1.2 1.25
E40M35 At e p π0p 0.317 0.452 1.25 1.3
E40M36 At e p π0p 0.317 0.452 1.3 1.4
E40M37 At e p π0p 0.317 0.452 1.4 1.5
E40M38 At e p π0p 0.317 0.452 1.5 1.6
E40M39 At e p π0p 0.317 0.452 1.6 1.7
E40M40 At e p π0p 0.452 0.77 1.1 1.15
E40M41 At e p π0p 0.452 0.77 1.15 1.2
E40M42 At e p π0p 0.452 0.77 1.2 1.25
E40M43 At e p π0p 0.452 0.77 1.25 1.3
E40M44 At e p π0p 0.452 0.77 1.3 1.4
E40M45 At e p π0p 0.452 0.77 1.4 1.5
E40M46 At e p π0p 0.452 0.77 1.5 1.6
Created in SINP MSU, CLAS Collaboration