We have measured the magnetic moments of the Sigmasup + and bar Sigma sup minus hyperons produced by 800-GeV protons incident on a Cu target. We determine the Sigmasup + magnetic moment to be ...(2.4613plus minus0.0034plus minus0.0040)musub ital N where the uncertainties are statistical and systematic, respectively. In this first measurement we determine the magnetic moment of the bar Sigma sup minus to be minus(2.428plus minus0.036plus minus0.007)musub ital N. The magnetic moments of the Sigmasup + and bar Sigma sup minus are consistent with each other in magnitude but opposite in sign as required by ital CPT invariance.
We have measured the branching ratio for the hyperon radiative decay Xisup minusr arrowSigmasup minusgamma from a sample of 211plus minus33 events obtained in the polarized 375 GeV/ital c charged ...hyperon beam at Fermilab. We find ital B(Xisup minusr arrowSigmasup minusgamma/Xisup minusr arrowLambdasup 0pisup minus)=(1.22plus minus0.23plus minus0.06)times10sup minus4 where the quoted errors are statistical and systematic, respectively. We have also obtained an indication that the sign of the asymmetry parameter of this decay is positive.
We have measured the asymmetry parameter ({alpha}{sub {gamma}}) in the hyperon radiative decay {Sigma}{sup +}{r arrow}{ital p}{gamma} with a sample of 34 754{plus minus}212 events obtained in a ...polarized charged hyperon beam experiment at Fermilab. We find {alpha}{sub {gamma}}={minus}0.720{plus minus}0.086{plus minus}0.045, where the quoted errors are statistical and systematic, respectively.
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