Bose-Einstein correlation of kaons in Si+Au collisions at 14.6AGeV/c

The E-802 spectrometer at the Brookhaven Alternating Gradient Synchrotron, enhanced by a trigger for selection of events with one or more specified particles, has been used to measure the momentum-space correlation between pairs of ${\mathit{K}}^{+}$’s emitted in central Si+Au collisions at 14.6 A GeV/c. This correlation has been projected onto the Lorentz-invariant relative four-momentum axis. Fits to this correlation function yield a size for the kaon source that is comparable to that found using ${\mathrm{\pi }}^{+}$ pairs from a similar rapidity range, once a transformation from the particle-pair frames to a single source frame is made.