1. Validation of valid3 samples Zee(106050) and Jpsiee(105751)
FredD., Nicolas K.,R.D S., Fany D., Lydia F.
Lydia Fayard July 17th

2. 14.2-15.3.0.1 : Main differences Rel15 has a better track choice
”Photon conversions” move from Photon to Electron container
Electron energy is replaced by a combined E&P information
New isEM definition with optimized cuts in more (η, pt) bins, starting from Pt>~3GeV
The valid3 sample is a reprocessing of mc08 starting from redoing digitisation to include xtalk
Lydia Fayard July 17th

3. The Zee sample (1) Efficiency in Container Efficiency for Loose
Efficiency for Medium
Rel 14
86.3%
84.3%
73.6%
Rel valid3
95.9%
91.3%
86.5%
Matching with truth: DR<0.2
REMARKS :
Efficiency in Container increases by 9.5% in absolute : better track choice and “photon conversions” are now in electron container
Loose efficiency in Rel15 increases by 7% in absolute
Medium efficiency in Rel15 increases by 12.9% in absolute
Current Medium Efficiency ~= Rel14 Container efficiency!
Lydia Fayard July 17th

4. The Zee sample (2)
Lydia Fayard July 17th

5. The new Electron Energy (electron.e())
Before Rel15.3 :
electron.e()=electron.cluster.e()
From on, the electron energy
variable contains a combined E & P value.
(see Tulay+Thomas+Teddy in eg meeting
held on 03/06/09).
This gives an e/p variable much thinner in
Rel than in Rel14. Attract lowPt
electrons under the peak
newE(elec)-E(cluster)=f(Ept)
Explains new linearity/uniformity shapes
(shown in next slide)
For Id purposes , one has to re-
compute by hand e/p a sclusterE/trackP
JPsiee
Lydia Fayard July 17th

6. Zee (3): Uniformity/Linearity
E=electron.e()
Open dots: Rel14 AODs read with Rel15.3
Triangles: Rel15 valid3
E=electron.cluster.e()
Lydia Fayard July 17th

7. The Z invariant mass Because the new E&Pcombined electron energy
the invariant Zee mass computed from electron quadri-vector has changed vs Rel14
Warning:
Pay attention: use
Electron.cluster.e() in current AODs
Thomas replaced the electron.eoverp() variable with the electron.cluster(). E()/electron.trackParticle.p()
(from egammaPIDTools on)
Lydia Fayard July 17th

8. Lower rate of fakes at Loose level in Rel15.3.0.1
Fraction of fakes
Open dots: Rel14 AODs read with Rel15.3
Triangles: Rel15 valid3
Lower rate of fakes at Loose level in Rel
At Medium level : ~= equal rates between Rel14 & rel15
Lydia Fayard July 17th

9. Electron shapes in Calo
A number of ID variables
related to shower shapes have
changed in
Origin: the included Xtalk
during re-digitization.
Not all of them are used to the
new isEM criteria
 Check the new isEM cuts tuning
(bw: thresholds were defined
safely)
W1s: From Evgeny
See ValidationMeeting 14/06/09
Lydia Fayard July 17th

10. Medium efficiency better by +4.5% in Rel15
Direct JPsi sample(1)
Efficiency in Container
Efficiency for Loose
Efficiency for Medium
Rel 14
42.4%
37.0%
29.8%
Rel valid3
42.8%
36.4%
34.2%
RELATED REMARKS :
Number of soft electrons decreases in Rel by ~32% (better track choice).
Efficiency in Container increases slightly (0.4%) : conversion reco is low at low Pt
Loose efficiency in Rel15 for low Pt ~>3GeV ~= Loose Eff Rel14 for Pt>7GeV
Medium efficiency better by +4.5% in Rel15
Lydia Fayard July 17th

11. Gains increase with eta (isEM optimization)
Direct Jpsi sample(2)
Gains increase with eta (isEM optimization)
Lydia Fayard July 17th

12. Direct JPsi sample(3) Duplicates: The new Sliding Window
thresholds ARENOT in (Guillaume).
Duplicate rate should be the same
for Rel14 and Rel valid3 samples.
However: computing duplicate rate
`a la Gaby&Guillaume (see eg07/07/09)
one finds :
Rel14 : 3.1% Rel15: 2.1%
BEWARE : a lot of soft changes can simulate
duplicate fraction change (track choice,
efficiency increase..)
 Clusters energy distribution starts
at ~3GeV in both Rel14 and Rel
valid3 samples
Lydia Fayard July 17th

13. Standard Dphi DphiRescaled
The new deltaPhi
Zee sample
Standard Dphi DphiRescaled
 deltaPhiRescaled :
stored in EMtrackMatch egDetail
Corresponds to the difference in phi
between the cluster and the track at its
origin with the momentum rescaled to
Ecluster
Information correctly stored
Remarks: this new deltaphi can be used
also at the track-cluster match level.
Recovers ~3% of electrons.
Available as an option for
AOD->AOD,DPD use.
Lydia Fayard July 17th

14. Conclusions
The valid3 samples show that optimization in electron reconstruction is effective
Over all Pt spectrum, we have now a medium efficiency of
86.5% ( 73.6% in Rel14) without changing fake rates.
The optimized SW is still off
Need attention to e, e/p and shower shape treatment
Lydia Fayard July 17th