1. Run and Luminosity dependence of p17 NN b-tag
D. Bloch, V. Siccardi (IPHC Strasbourg)
Data sample : full pass3 p pass2 p170901
(note that pass2 p was not used in p17 NN TRFs)
BID sample : 22M muon-jet events
QCD sample : 6M multi-jet events
(taking 1 event / 8 over the full stat)
Trigger lists : roughly (there are some overlaps)
v11 : run ≤ v12 : ≤ run ≤ v13 : ≤ run ≤ v14 : run ≥
D. Bloch (IPHC Strasbourg)
bid meeting October 13, 2006

2. D. Bloch (IPHC Strasbourg)
Run range
in red : data set not used in present p17 NN TRFs
v v v v14
D. Bloch (IPHC Strasbourg)
bid meeting October 13, 2006

3. D. Bloch (IPHC Strasbourg)
Et/η behaviour : vs Run
<Et> (GeV)
Muon
QCD
v11 30 59
v12 53
v13 32 55
v14 34 56
 will distinguish jet with Et < 45 GeV or > 45 GeV in the QCD sample (stat is not large enough to do it in the BID sample)
D. Bloch (IPHC Strasbourg)
bid meeting October 13, 2006

4. Et/η behaviour : vs Lumi
<Et> (GeV)
Muon
QCD
Lumi<20 30 52
20-40 32 55
40-80 33 60
Lumi>80 34 54
more jets at high η and high Lumi in the QCD sample ??
D. Bloch (IPHC Strasbourg)
bid meeting October 13, 2006

5. D. Bloch (IPHC Strasbourg)
NN tag efficiencies
will consider 4 trigger list periods : v11 to v14
and 4 instantaneous Luminosity ranges : < , , , > cm-2s-1
as well as 2 Et ranges for the QCD sample (<, > 45 GeV)
and 3 working points : NN cut >
0.45 (Loose), 0.65 (Medium), 0.90 (UltraTight)
Then :
muon-jet b-tag from System8
and
QCD-jet negative tag rate
D. Bloch (IPHC Strasbourg)
bid meeting October 13, 2006

6. D. Bloch (IPHC Strasbourg)
will estimate Run dependence if Lumi < and Lumi dependence in v13-v14
(the Lumi dependence seems smaller in v11-v12…)
D. Bloch (IPHC Strasbourg)
bid meeting October 13, 2006

7. D. Bloch (IPHC Strasbourg)
similar behaviour for the other working points :
D. Bloch (IPHC Strasbourg)
bid meeting October 13, 2006

8. D. Bloch (IPHC Strasbourg)
similar Run dependence in b-tag and mistag
still some Lumi dependence at low Et
but not really at high Et (if Lumi ≥ in v13-v14)
D. Bloch (IPHC Strasbourg)
bid meeting October 13, 2006

9. D. Bloch (IPHC Strasbourg)
similar behaviour for the other working points :
D. Bloch (IPHC Strasbourg)
bid meeting October 13, 2006

10. Summary : Run dependence
Observed decrease of efficiency between runs and :
Loose
Medium
UltraTight
b-tag eff.
-10.1 ± 2.6 %
-12.2 ± 2.8 %
-15.1 ± 3.1 %
mistag eff.
-9.6 ± 0.9 %
-13.0 ± 1.3 %
-21.2 ± 2.6 %
Ageing of silicon tracker ?
D. Bloch (IPHC Strasbourg)
bid meeting October 13, 2006

11. Summary : Lumi dependence
Observed decrease of efficiency in v13-v14 trigger lists (for jets with Et < 45 GeV) :
But no significant effect at higher Et if Lumi ≥
in (% / 1031)
Loose
Medium
UltraTight
b-tag eff.
-0.64 ± 0.32
-1.05 ± 0.34
-1.49 ± 0.38
mistag eff.
-0.59 ± 0.24
-0.85 ± 0.36
-2.40 ± 0.79
D. Bloch (IPHC Strasbourg)
bid meeting October 13, 2006