Agenda 10-Aug-2006 Telephone Meeting
- Notes from 18-Jul-2006 meeting
- Reports from the CERN run (hopefully).
Power failure/storm damage over weekend 29-July, in particular to
failure of PS injection septum meant that most of scheduled ~2 weeks beam
time from 31-Jul was lost. Injection attempted p.m. of 7-Aug,
data taken on 8-9 Aug, up to 40 GeV e-, and 60 GeV
pions. Beam size is large, ~8x8cm. Data may be difficult to
obtain in next few days.
- Reports on data analysis from the May'06 DESY running
estimate of energy resolution - David Hadley
Reduced background following David Ward approach of previous
meeting using several variables in likelihood, then fitted single
and double electon peaks to determine energy resolution of
~17%/sqrt(E). Slightly larger than expected resolution attributed
to Small leakage, no correction for missing layers event-by-event
and no weighting for differing absorber thicknesses.
- Digisim and noise studies
- Anne-Marie Magnan
- Physics analysis /Pflow studies
- MAPS clustering -
Plans to start working on clustering specifically for MAPS, based
on position/density of clusters alone
of particle flow with PandoraPFA - Mark Thomson
Summarised current performance and plans to distribute code in
near future. Noted change in approach for case where a
energy/track momentum are not in agreement: will now attempt to
split up the cluster by reapplying whole clustering until
acceptable agreement with track momentum obtained. If not
possible, the track itself will be dropped leaving cluster
Significant efforts at optimisation (but not much room for
improvement found), reclustering most important at higher energies.
Current version of code available at: http://www.hep.phy.cam.ac.uk/~thomson/pandoraPFA,
performance as documented in LCWS06 writeup, and today's
Suggestion was that now code is available several of us should try
to use it and evaluate performance in different applications and
with e.g. variation of hadronic interaction modelling, etc.
- ee->vvWW and ee->vvZZ (.pdf, .ps) - Wenbiao Yan
Summary of ongoing WW/ZZ analysis work, comparing di-jet mass
resolutions of W and Z at each of parton level, hadron level and
detector level (using PandoraPFA). Found parton shower increases
fitted BW width by x2.5 relative to natural W/Z width, while
hadronisation/undetected particles are ~10% effects. Have obtained
results for WW/ZZ separation through entire analysis chain now.
- MC Production (RHUL, Bham, Manch. 1, Manch. 1) - Fab/Dave
Had met at UCL recently, agreed various details e.g. naming
conventions for MC production files for grid storage elements,
versions of G4/Mokka and dependant packages for purposes of testing
MC generation at each of the three institutes. Testing with same
simple test job on each farm using Fab's TBdesy0506 driver. Dave had
made some changes to simplify setting of random number seeds with
Geant, code distributed and being tested.