Publications [#246743] of Calvin R. Howell

Papers Published
  1. al, VPE; Churchwell, JH-ACIS; Howell, CR; Macri, RA, Proton Elastic Form Factor Ratios to Q2 = 3.5 GeV2 by Polarization Transfer, Phy. Rev. C, vol. 71 no. 5 (2005), pp. 069902, American Physical Society (APS) [doi] .

    Abstract:
    The ratio of the proton elastic electromagnetic form factors, GEp/GMp, was obtained by measuring Pt and P, the transverse and longitudinal recoil proton polarization components, respectively, for the elastic e→p→ep→ reaction in the four-momentum transfer squared range of 0.5 to 3.5GeV2. In the single-photon exchange approximation, GEp/GMp is directly proportional to Pt/P. The simultaneous measurement of Pt and P in a polarimeter reduces systematic uncertainties. The results for GEp/GMp show a systematic decrease with increasing Q2, indicating for the first time a definite difference in the distribution of charge and magnetization in the proton. The data have been reanalyzed and their systematic uncertainties have become significantly smaller than those reported previously. © 2005 The American Physical Society.

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