Minutes of the "Discussion on Event Size" meeting, 25/05/2000

1. Present event size on DST1 of more than 2 Mbytes/eventscauses problems in production (especially at Lyon, stageing and analysis. Moreover it will increase:

on DST2

with full RICH pattern

foreseen changes in Geant description of the Tracker (4xnr Tracker RAWH banks)

2. Dropping of all RAWH banks has been considered:

no reconstruction (tuning) on DST level
would need a rewriting of the code related to the link to ATMC banks in Gaudi, which is done for almost all subdetectors via RAWH banks,except for CALOs.

Decision taken: only CALOs RAWH banks will be dropped on standard DST,immediately after RICH TDR production. In future, going to the physical cells in Geant is also considered for calorimeters.

3. Adding an additional reference to ATMC (overpassing RAWH banks) in SICB has been proposed and rejected.

4. A pending problem of understanding the difference between the calculated and the measured event size (~0.3Mbytes) should be clarified as soon as possible.

5. A proposal for the Analysis Minidst (in view of millions of bbars) has been discussed.It would contain: AXTK,ATMC,AVMC,PGEN and maybe some RICH related banks. Dropping of MC information for secondaries which do not endup in AXTK banks should be considered. This is a new project and a proposal will be elaborated and presented first in a Physics meeting (provisionally end June). The Minidst will be fully readable in SICB and Gaudi.

May 26,Y2K, Agnieszka.