These are some HBT pictures from NA44 pipi data sets in PbPb collisions. The
thing I want to draw attention to is the fact that the size parameters seen
here are of order 5-7 fm. This contrasts with what NA44 was designed for: when
plans were drawn up, expected sizes in PbPb were much larger, up to 20 fm.
What happened?
Reference: (John Sullivan, preliminary)
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