Measurement of ΛΛ spin correlations in the SELEX experiment

We study HBT interferometry of ΛΛ pairs produced in ∑− A interactions using a ΛΛ spin composition measurement with data taken by SELEX, which accumulated data during the 1996–97 fixed target run at Fermilab. While the spin composition of a ΛΛ pair in the range of four-momentum difference of a pair Q 1.5 GeV it was found to be consistent with statistical spin mixture. For the system the spin one fraction was found to be consistent with the expectation for a statistical spin mixture. We also estimated the dimension of the ΛΛ production region.