In an experiment performed at Fermilab, we have observed the weak radiative decay {Xi}{sup 0}{r arrow}{Sigma}{sup 0}{gamma}. From a sample of 85{plus minus}10 events we have preliminary measurement of the decay branching ratio {Gamma}({Xi}{sup 0}{r arrow}{Sigma}{sup 0}{gamma})/{Gamma}({Xi}{sup 0}{r arrow} {Lambda}{pi}{sup 0})=(3.56{plus minus}0.42){times}10{sup {minus}3} and the asymmetry parameter {alpha}{sub {Xi}}=0.20{plus minus}0.28.

A preliminary measurement of the. Xi. sup 0 r arrow. Sigma. sup 0. gamma. branching ratio and asymmetry parameter

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A preliminary measurement of the. Xi. sup 0 r arrow. Sigma. sup 0. gamma. branching ratio and asymmetry parameter