Djamel, Thanks for posting; A few extra questions I assume the centrality is 0-5 ? Is the protons/anti really at 2.98 and 3.05 i.e. .07 difference. To help understand where the losses are (yes the pions are too low) it could be useful to summarize this in a table where eff's are multipled on - tracking eff (per chamber) - multiplied tracking eff - matching effeciencies assumed. - RICH effeciencies - target cuts.. The rationale for this is to identify which one are likely to be missed. What is the final deciding fiducial volumes ? A useful check might be to comnpare the accepted phi-range in the data sample with that of the MC accepted phi-range. e.g. a similar plot to the one used for comparing y-pt accepted vs y-pt measured. It could even be done in phi-theta (calc- measured) good luck Flemming ------------------------------------------------------ Flemming Videbaek Physics Department Brookhaven National Laboratory
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