Michel
informed us that Peter Jenni has been re-elected as
spokesperson of ATLAS.
Margret
reported that she has been preparing for the G4tutorial at SLAC.
She is also working on compiling a stand-alone version of LArG4
at UVic (which appears to be a little tedious).
She has also given some help to Richard and Tayfun, trying to track
down what might be plaguing Tayfun's beam chamber information.
Richard
pointed out to the group that there is a nice review article on Calorimeters
written by Chris Fabian and Fabiola Gianotti in Rev. Mod. Phys, Oct 2003, vol.75 no.4, p1243.
He says it looks good and is very readable.
Tamara
is continuing her pursuit of the timing problems in the pion runs.
She has now looked at events where the timing comes from only the
HEC or only the EMEC, and she finds that there is a still a bias in
the energy vs time distributions - although less severe than it was
when the timing was based on signals obtained by any of the two calorimeters.
A possible explanation could be that the remaining bias is due to
the start of the showers: The earlier a shower starts, the easier it is
to get a good EMEC time.
In order to follow this up, one of the next things to do is to look
at runs, where the TDC was working and see whether the timing information
can be correlated.
Richard thinks that there is a possibility that there could be timing
differences for runs, where the F and B trigger counters were or-ed.
Tayfun
presented several plots of his attempt to track down the poor position
correlation between the wire-chambers and the EMEC. There is a small
portion of the events in the runs where the F and B counters were or-ed
that are well correlated and a large portion where the MWPCs and the EMEC
position appears to be totally uncorrelated - although largely limited to
a "blob" of about 3cm x 3cm in MWPC vs EMEC coordinates (x or y respectively).
There appears to be nothing wrong with the clusters in the EMEC and the
wire-chamber fits don't have large errors. What keeps us all flummoxed
is: Why does this seem to happen throughout the runs where F and B were or-ed?
For the good correlated events, Tayfun finds that the spacial resolution is about 0.09cm,
improved by a factor of 10 compared to what he obtained when he looked at the
uncorrelated events only.