MET Object corrections
- Effect of the corrections :
Sample WZ, Z->ee , 117pb-1 , 12000 evts, p14TMBfixer01 + d0correct
MET corrections for JCCA (blue) and JCCB (red) for respectively CH, JES, bad jets,
em-scale and muons
Requiring no jets
METC (black), METD (green), METE
(purple) with METE = METC -T42 corrected
META (blue) and METB (red)
Uncorrected Corrected
Luminosity block
selection
334
runs
studied between 178309 and 180956
- 47490 lumi blocks => 106.9
Mevts (52.6 pb-1)
* In the « official» Physics Runs database ? 337 runs listed
* 326 in common
* 11 are in the db but are zeroB or not in tmb
* 24 runs are excluded because flagged bad by Slava or after reading the logbook
(43698 lumi blocks / 98.0 Mevts / 48.5 pb-1)
* Studies done at cc-in2p3 on thumbnails
For each lumi block we run on all
events and get the mean values and RMS of METBx, METBy,SETB and MET-T42x,
MET-T42y,SET-T42 distributions.
Definitions :
METB = MET computed with cells
not belonging to the CH (Ecell>0, layer<15) and with the CH fraction
of JCCB jets.
MET-T42 = METC (Ecell>0) - T42
cells
Variables computed with mean values
of distributions of all events in a run:
SHIFT-metbxy = sqrt (<metbx>**2 + <metby>**2)
RMS-metbxy = sqrt (RMS-metbx**2 + RMS-metby**2)
Mean-setb
Cuts at the lumi block level :
SHIFT-metbxy < 4 GeV
RMS-metbxy < 22 GeV
Mean-setb > 80 GeV
Nevts > 500
With this selection we
keep 40597
lumi blocks / 93.2 Mevts
and we save 92.9
% of lumi bks or 95.1 % of evts.
The luminosity block selection has
not been done for previous data. If you need
a similar selection for p13 data,
let
us know.
METBx
for each lumi block
METBy for each lumi block
Before selection
Before selection
After selection
After selection
<METB> for each lumi block after selection RMS METB for each lumi block after selection
6 oct 03 : MET status
21 oct 03 : MissingET corrections
18 nov 03 : Status of MET certification
3 dec 03 : MET Certification
3 dec 03 : MET and d0correct
Patrice Verdier and Sophie Trincaz Duvoid: last update 4 dec 2003