منابع مشابه
Nucleon Strange Magnetic Moment and Relativistic Covariance
We calculate the corrections to the strange matrix elements of the nucleon resulting from the breaking of rotational invariance on the light-cone. In the meson cloud model, the strange magnetic moment µ S is seen to change sign once the spurious form factors arising from this violation are subtracted. The resulting µ S is small and slightly positive, in agreement with the trend of the recent da...
متن کاملLattice Calculation of the Strangeness Magnetic Moment of the Nucleon
We report on a lattice QCD calculation of the strangeness magnetic moment of the nucleon. Our result is GM (0) = −0.36 ± 0.20. The sea contributions from the u and d quarks are about 80% larger. However, they cancel to a large extent due to their electric charges, resulting in a smaller net sea contribution of −0.097 ± 0.037μN to the nucleon magnetic moment. As far as the neutron to proton magn...
متن کاملPrecise determination of the strangeness magnetic moment of the nucleon.
By combining the constraints of charge symmetry with new chiral extrapolation techniques and recent low mass quenched lattice-QCD simulations of the individual quark contributions to the magnetic moments of the nucleon octet, we obtain a precise determination of the strange magnetic moment of the proton. The result, namely, G(s)(M)=(-0.046 +/- 0.019)mu(N) is consistent with the latest experimen...
متن کاملThe Strangeness Radius and Magnetic Moment of the Nucleon Revisited
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 ...
متن کاملShould the Strange Magnetic Moment of the Nucleon be Positive?
The strange magnetic moment of the nucleon (µ s) is examined as part of the nucleon's isoscalar anomalous moment. The dominant up and down quark effects in the anomalous moment may actually tend to favor µ s > 0, which is contrary to the negative values that generally result from model calculations. The possible origins of this apparent discrepancy are considered. Several years ago, Kaplan and ...
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ژورنال
عنوان ژورنال: Progress of Theoretical Physics
سال: 1949
ISSN: 0033-068X,1347-4081
DOI: 10.1143/ptp/4.4.532