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THE STRANGENESS RADIUS AND MAGNETIC MOMENT OF THE NUCLEON REVISITED #1
, 1995
"... We update Jaffe’s estimate of the strange isoscalar radius and magnetic moment of the nucleon. We make use of a recent dispersion–theoretical fit to the nucleon electromagnetic form factors and an improved description of symmetry breaking in the vector nonet. We find µs = −0.24 ± 0.03 n.m. and r2 s ..."
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We update Jaffe’s estimate of the strange isoscalar radius and magnetic moment of the nucleon. We make use of a recent dispersion–theoretical fit to the nucleon electromagnetic form factors and an improved description of symmetry breaking in the vector nonet. We find µs = −0.24 ± 0.03 n.m. and r2 s = 0.21 ± 0.03 fm2. The strange formfactor F s 2 (t) follows a dipole with a cut–off mass of 1.46 GeV, F s 2 (t) = µs(1 − t/2.14GeV 2) −2. These numbers should be considered as upper limits on the strange vector current matrix–elements in the nucleon. #1
TRI-PP-98-41 K ¯ K-Continuum and Isoscalar Nucleon Form Factors
, 1999
"... We analyse the isoscalar vector current form factors of the nucleon using dispersion relations. In addition to the usual vector meson poles, we account for the K ¯ K-continuum contribution by drawing upon a recent analytic continuation of KN scattering amplitudes. For the Pauli form factor all stren ..."
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We analyse the isoscalar vector current form factors of the nucleon using dispersion relations. In addition to the usual vector meson poles, we account for the K ¯ K-continuum contribution by drawing upon a recent analytic continuation of KN scattering amplitudes. For the Pauli form factor all strength in the φ region is already given by the continuum contribution, whereas for the Dirac form factor additional strength in the φ region is required. The pertinent implications for the leading strangeness moments are demonstrated as well. We derive a reasonable range for the leading moments which is free of assumptions about the asymptotic behavior of the form factors. We also determine the φNN coupling constants from the form factor fits and directly from the K ¯ K → N ¯ N partial waves and compare the resulting values.
