Determination of theΣ+Magnetic Moment Using the ReactionK−+p→Σ++π−at 1.15 BeV/c

Abstract

A sample of 52 $\Sigma p$ decays satisfying hydrogen-like production kinematics yields ${\mu }_{{\Sigma }^{+}}=+3.5\mathrm{}\pm 1.5{\mu }_N$ and $\alpha \overline{P}=-0.69\mathrm{}\pm 0.15$ relative to ${\hat{P}}_K\times {\hat{P}}_{\Sigma }$. The effect of all magnetic field components along the ${\Sigma }^{+}$ path has been included, as well as that of the c.m. decay angle on detection efficiency. The measurement of ${\mu }_{{\Sigma }^{+}}$ can be averaged with an earlier result to give ${\mu }_{{\Sigma }^{+}}=+3.2\mathrm{}\pm 0.9{\mu }_N$, consistent with the prediction by SU(3).