Abstract

Direct CP violation in nonleptonic hyperon decays can be established by comparing the decays of hyperons and anti-hyperons. For Ξ decay to Λπ followed by Λ to pπ, the proton distribution in the rest frame of Lambda is governed by the product of the decay parameters αΞα Λ . The asymmetry Λ ΞΛ , proportional to the difference of αΞα Λ 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. The preliminary measurement of the assymmetry is A ΞΛ = [−7±12(stat)±6.2(sys)] × 10 −4, an order of magnitude better than the present limit.

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