Polarization transfer in the {sup 2}H(e-vector,e{sup '}p-vector)n reaction up to Q{sup 2}=1.61 (GeV/c){sup 2}

Journal Article · Thu Jun 15 04:00:00 EDT 2006 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.73.064004· OSTI ID:20771576

Hu, B; Baker, O K; Cochran, A; Keppel, C ^[1]; Jones, M K; Ulmer, P E; Klein, A; Kuhn, S; Todor, L; Weinstein, L B ^[2]; Arenhoevel, H ^[3]; Bertozzi, W; Gilad, S; Liyanage, N; Rowntree, D ^[4]; Brash, E J; Dumalski, S; Hovebo, J; Kozlov, A; Lolos, G J ^[5]

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1. Hampton University, Hampton, Virginia 23668 (United States)
2. Old Dominion University, Norfolk, Virginia 23529 (United States)
3. Johannes Gutenberg-Universitaet, D-55099 Mainz (Germany)
4. Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
5. University of Regina, Regina, SK, S4S 0A2 (Canada)

The recoil proton polarization was measured in the {sup 2}H(e-vector,e{sup '}p-vector)n reaction in Hall A of the Thomas Jefferson National Accelerator Facility. The electron kinematics were centered on the quasielastic peak (x{sub Bj}{approx_equal}1) and included three values of the squared four-momentum transfer, Q{sup 2}=0.43,1.00 and 1.61 (GeV/c){sup 2}. For Q{sup 2}=0.43 and 1.61 (GeV/c){sup 2}, the missing momentum, p{sub m}, was centered at zero, whereas for Q{sup 2}=1.00 (GeV/c){sup 2} two values of p{sub m} were chosen: 0 and 174 MeV/c. At low p{sub m}, the Q{sup 2} dependence of the longitudinal polarization, P{sub z}{sup '}, is not well described by a state-of-the-art calculation. Further, at higher p{sub m}, a 3.5{sigma} discrepancy was observed in the transverse polarization, P{sub x}{sup '}. Understanding the origin of these discrepancies is important to confidently extract the neutron electric form factor from the analogous {sup 2}H(e-vector,e{sup '}n-vector)p experiment.

• OSTI ID: 20771576
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 73; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CEBAF ACCELERATOR
DEUTERIUM TARGET
ELECTROMAGNETIC FORM FACTORS
ELECTRON BEAMS
ELECTRON REACTIONS
ELECTRONS
FOUR MOMENTUM TRANSFER
GEV RANGE
MEV RANGE
NEUTRONS
POLARIZATION
POLARIZED BEAMS
PROTONS