Bose-Einstein correlations and the transition time from QCD plasma to   hadrons
  It is pointed out that the size of the interaction region, as determined from HBT analyses, is increased due to the transition time necessary the convert the quarks and gluons into hadrons. A rough estimate yields an increase of R_HBT by about 15%. 
A. Bialas and K. Zalewski
hep-ph nucl-th