Search for CP Violation in Hyperon Decays
          Piotr Zyla, LBNL (Representing HyperCP Collaboration)

    Direct CP violation in nonleptonic hyperon decays can be established
by comparing the decays of hyperons and anti-hyperons. For Xi decay
to Lambda pi followed by Lambda to p pi, the proton distribution
in the rest frame of Lambda is governed by the product of the decay
parameters alpha_Xi*alpha_L. The asymmetry A_Xi_L, proportional
to the difference of alpha_Xi*alpha_L of the hyperon and anti-hyperon decays,
vanishes if CP is conserved. We report on an analysis of a fraction
of 1997 and 1999 data collected by the HyperCP (E871) collaboration during
the fixed-target runs at Fermilab. This analysis should reach a sensitivity
in A_Xi_L asymmetry an order of magnitude better than the present limit.