Strangeness spin, magnetic moment and strangeness configurations of the proton

Abstract

The implications of the empirical signatures for the positivity of the strangeness magnetic moment $μ_s$, and the negativity of the strangeness contribution to the proton spin $Δ_s$, on the possible $uuds\bar s$ configurations of five quarks in the proton are analyzed. The empirical signs for the values of these two observables can only be obtained in configurations where the $uuds$ system is orbitally excited and the $\bar s$ quark is in the ground state. The configurations, in which the $\bar s$ is orbitally excited, which include the conventional $K^+Λ^0$ congfiguration, with the exception of that, in which the $uuds$ component has spin 2, yield negative values for $μ_s$. Here the strangeness spin $Δ_s$, the strangeness magnetic moment $μ_s$ and the axial coupling constant $G_A^s$ are calculated for all possible configurations of the $uuds\bar s$ component of the proton. In the configuration with $[4]_{FS}[22]_F[22]_S$ flavor-spin symmetry, which is likely to have the lowest energy, $μ_s$ is positive and $Δ_s\simeq G_A^s\simeq -1/3μ_s$.