Polarization transfer in the d(epol,e' ppol)n reaction up to Q^2=1.61 (GeV/c)^2

Abstract

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

6 pages, 4 figures; updated text, figures and tables

References in corpus (12)

• The ratio of proton's electric to magnetic form factors measured by polarization transfer
• Measurement of GEp/GMp in ep -> ep to Q2 = 5.6 GeV2
• Proton elastic form factor ratios to $Q^2$ = 3.5 GeV${}^2$ by polarization transfer
• Two-photon exchange in elastic electron-nucleon scattering
• The Charge Form Factor of the Neutron from the Reaction \pol{2H}(\pol{e},e'n)p
• Measurements of GEn/GMn from the ^2H(vec{e},e'vec{n})^1H Reaction to Q^2=1.45 (GeV/c)^2
• Measurement of the Electric Form Factor of the Neutron at Q^2=0.5 and 1.0 (GeV/c)^2
• Measurement of the Electric Form Factor of the Neutron at Q^2 = 0.3-0.8 (GeV/c)^2
• Polarization Transfer in the ^4He(\vec e,e'\vec p)^3H Reaction up to Q^2 = 2.6 (GeV/c)^2
• Polarization transfer in the ${}^4$He$(\vec{e},e^{\prime }{\vec{p}}^3$H reaction
• Effect of recent R_p and R_n measurements on extended Gari-Krumpelmann model fits to nucleon electromagnetic form factors
• Measurements of the neutron electric to magnetic form factor ratio GEn/GMn via the ^2H(\vec{e},e'\vec{n})^1H reaction to Q^2 = 1.45 (GeV/c)^2

Cited by in corpus (28)

• Nucleon Electromagnetic Form Factors
• Low Q^2 measurements of the proton form factor ratio $m{u}_p{G}_E/G_M$
• Hard Two-Photon Contribution to Elastic Lepton-Proton Scattering: Determined by the OLYMPUS Experiment
• Electromagnetic form factors of the nucleon: new fit and analysis of uncertainties
• Generalized Parton Distributions and Description of Electromagnetic and Graviton form factors of nucleon
• Electric form factors of the octet baryons from lattice QCD and chiral extrapolation
• The Proton Elastic Form Factor Ratio at Low Momentum Transfer
• An experimental program with high duty-cycle polarized and unpolarized positron beams at Jefferson Lab
• The OLYMPUS Experiment
• Effects of a spin-flavour dependent interaction on the baryon mass spectrum
• Medium Modifications of Hadron Properties and Partonic Processes
• Crossing the phantom divide with Ricci-like holographic dark energy
• Strong Interaction Physics at the Luminosity Frontier with 22 GeV Electrons at Jefferson Lab
• Measurement of polarization-transfer to bound protons in carbon and its virtuality dependence
• Ejectile Polarization for ${}^{2}H(e,e^{\prime }\vec{p})n$ at GeV energies
• Proton Form Factor Ratio, ${\mu }_p{G}_E^p/G_M^p$ from Double Spin Asymmetry
• Momentum transfer dependence of generalized parton distributions
• Measurement of the Charge-Averaged Elastic Lepton-Proton Scattering Cross Section by the OLYMPUS Experiment
• Polarization transfer to bound protons measured by quasi-elastic electron scattering on ${}^{12}$C
• Comparison of recoil polarization in the ${}^{12}\mathrm{C}(\vec{e},e^{\prime }\vec{p})$ process for protons extracted from $s$ and $p$ shell
• Nuclear Density Dependence of In-Medium Polarization
• Quasi-elastic polarization-transfer measurements on the deuteron in anti-parallel kinematics
• The influence of Fermi motion on the comparison of the polarization transfer to a proton in elastic $\vec{e}p$ and quasi-elastic $\vec{e}A$ scattering
• Electromagnetic and Axial-Vector Form Factors of the Quarks and Nucleon
• Measurement of polarization transfer in the quasi-elastic ${}^{40}\mathrm{Ca}(\vec{e},e^{\prime }\vec{p})$ process
• Electromagnetic nucleon form factors in the extended vector meson dominance model
• Factorization Breaking of $A_d^T$ for polarized deuteron targets in a relativistic framework
• Polar polarization: a new method for polarimetry analysis