mail from Maaijke from 06 Aug 2004 about new FLT maps in 2003
Date: Fri, 06 Aug 2004 19:43:21 +0200 (MEST)
From: Maaijke Mevius 
To: hbanalysis 
Subject: FLT efficiency maps 2003

Dear all,

Due to some misunderstandings ALL 2003 MC has been reconstructed with the
old FLT-efficiency maps. Fortunately, Antonello has written a patch which
can be used to recover the trigger weight from the new FLT efficiency maps
for MC mini's. One should use this code for the 2003 MC to get the
improved FLT-efficiencies.

A description plus the code can be found at the end of the flt analysis
page:
http://www-hera-b.desy.de/subgroup/physics/herab/analysis/cc2003/flt.html

Dima has made a new keybook number, for which the only change is the new
2003 FLT efficiency maps:

MC keybook 14

You should use this keybook in your kumac, and the

run2cnakey -

where  is defined for each period according to the following
scheme:


oct     nov     dec     jan     feb
210210  210211  210212  210301  210302
        211211          211301


(the extra numbers in nov and jan refer to special sub-configurations
within a month (nov.:missing quadrant, jan.: swapped muon optical links) )

More information on KEYBOOK's and CNAKEY's can be found in:

http://www-hera-b.desy.de/subgroup/software/arte/reco/keybook/keybook.html

After calling "FltEventWeightCalc();" in your usevnt.C (as explained by
Antonello) the weight is stored in the ArteTable.eflt[0]

!!!Please do not use the old and obsolete functions

probEtrig()
probMuTrig()
float probtrig(int & ptseeds, int ttype);

from the bbar page, acces the MCIN table directly to get the weight!





If anything is not clear, please let me know (Antonello will be on
holidays the next weeks)


best regards,

        Maaijke