How to access the corrected jet chunk after d0correct (starting from version p18)
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corrected Jet chunk:
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create a JetAlgoInfo for either JCCA or JCCB jets and access the corresponding
CorrJetChunk via a JetAlgoInfo. From this chunk, we will get a vector of
CorrJet. Each of those CorrJet contains all the needed informations (good
quality flags, JES corrections, ...). There is a one to one correspondance 
between the Jet out of d0reco and the CorrJet out of d0correct.


    string jetType = rcp.getString("JetAlgo_type");
    std::vector<float> jetValues = rcp.getVFloat("JetAlgo_values");
    std::vector<std::string> jetNames = rcp.getVString("JetAlgo_names");
    if ( jetNames.size() > 0 )
      while ( *jetNames.rbegin() == "" ) jetNames.pop_back();
    if ( jetValues.size() < jetNames.size() ) {
      cout << "D0ChunkAnalyze: inconsistent RCP values for the jet selection, disable it" << endl;
      jetNames.clear();
      jetValues.clear();
    }
    JetAlgoInfo jetAlgoInfo(jetType,jetValues,jetNames);
    CorrJetChunkSelector jsel(jetAlgoInfo);
    edm::TKey<CorrJetChunk>* keyJet = new edm::TKey<CorrJetChunk>(jsel);


with for JCCA, in your RCP:
  string JetAlgo_type = "PreSCilcone"
  string JetAlgo_names = ( "towers" "coneSize" "Radius_of_Cone" "Min_Jet_ET")
  float JetAlgo_values = (    0.       0.3          0.7             6.      )
   

To select only certified jets (as you got from the certified jet chunk for
d0correct before p18), we have to specify CorrJet.isGood() && !CorrJet.isEM().

For more infos, see:
http://www-d0.hef.kun.nl///askArchive.php?base=agenda&categ=a05727&id=a05727s1t5/transparencies/csg_20APR05_jets.pdf