Data Sets

Run Range	Data Set	Trigger	JSON
138564-139459, 140160-140401	EG_Run2010A-PromptReco-v4	Photon15_Cleaned_L1R	subset of:Cert_132440-144114_7TeV_StreamExpress_Collisions10_JSON_v2.txt
139779-140159	EG_Run2010A-Jul16thReReco	Photon15_Cleaned_L1R	Cert_139779-140159_7TeV_ July16thReReco_Collisions10_JSON.txt
141956-144114	EG_Run2010A-PromptReco-v4	Ele15_SW_CaloEleId_L1R	subset of:Cert_132440-144114_7TeV_StreamExpress_Collisions10_JSON_v2.txt

Tag Selection

Tag electrons are selected using tight criteria. We use two different "Tag" definitions, i.e. WP80_Tag and WP95_Tag. The conditions are defined below:

• WP80_Tag
  • Should be gsfElectron with supercluster |η| < 2.5, and et > 10 GeV.
  • Should have hadronicOverEm fraction < 0.15.
  • Should pass combined relative isolation criteria:
    • Barrel: combRelIso <0.07
    • Endcap: combRelIso <0.06
  • Should pass electron Identification Criteria:
    • Barrel: MissingHits ≤ 0, σ_iηiη<0.01, |Δ&phi|<0.06, |Δη|<0.004, HoE <0.04.
    • Endcap: MissingHits ≤ 0, σ_iηiη<0.03, |Δ&phi|<0.03, HoE<0.025.
  • Shoud Pass the HLT path of our interest
• WP95_Tag
  • Should be gsfElectron with supercluster |η| < 2.5, and et > 10 GeV.
  • Should have hadronicOverEm fraction < 0.15.
  • Should pass combined relative isolation criteria:
    • Barrel: combRelIso <0.15
    • Endcap: combRelIso <0.1
  • Should pass electron Identification Criteria:
    • Barrel: MissingHits ≤ 1, σ_iηiη<0.01, |Δ&phi|<0.08, |Δη|<0.007, HoE<0.15.
    • Endcap: MissingHits ≤ 1, σ_iηiη<0.03, |Δ&phi|<0.07, HoE<0.07.
  • Shoud Pass the HLT path of our interest

Probe Selection

• To obtain the denominator for the efficiency calculation, we use a probe collection (also called "AllProbes" collection) defined as follows:
  • All Probes
    • AllProbes_WP95 : Same as "WP95_Tag", but HLT conditions not applied.
    • AllProbes_WP80 : Same as "WP80_Tag", but HLT conditions not applied.
• To obtain the numerator for the efficiency calculation, we have to define "passingProbes" and "failingProbes".
  • passing Probes
    • WP95 : Subset of the AllProbes_WP95 which PASS HLT conditions.
    • WP80 : Subset of the AllProbes_WP80 which PASS HLT conditions.
  • failingProbes
    • WP95 : Subset of the AllProbes_WP95 which FAIL HLT conditions.
    • WP80 : Subset of the AllProbes_WP80 which FAIL HLT conditions.

Variables and Binning

Variables used for plotting are gsfElectrons_Pt, SC_Et, SC_Eta with binning as:

------------------------------------------------------------------------------
Pt/Et binned in (0,10,15,20,25,40,60,120)
|Eta| binned in (0,1.5,2.5)
Eta binned in   (-2.5, -2.0, -1.5, -1.0, -0.5, 0.0, 0.5, 1.0, 1.5, 2.0,  2.5) 
------------------------------------------------------------------------------

Here, I am showing efficiency in the bins of Et and Eta (taken from likelihood fit of Z mass).

Efficiency For HLT_Photon15_Cleaned_L1R

WP80	WP95

Efficiency For HLT_Ele15_SW_CaloEleId_L1R

WP80	WP95

Tabulated values for efficiencies

WP80

Trigger Name	Barrel			Endcap
SC Et Range	20-25	25-60	60-120	20-25	25-60	60-120
HLT_Ele15_SW_CaloEleId_L1R	0.979 ± 0.021	0.989 ± 0.003	1 ± 0.026	1 ± 0.035	0.99 ± 0.006	1 ± 0.052
HLT_Photon15_Cleaned_L1R	1 ± 0.185	0.989 ± 0.010	1 ± 0.241	1 ± 0.023	1 ± 0.027	----

WP95

Trigger Name	Barrel			Endcap
SC Et Range	20-25	25-60	60-120	20-25	25-60	60-120
HLT_Ele15_SW_CaloEleId_L1R	0.988 ± 0.012	0.987 ± 0.003	0.982 ± 0.018	1 ± 0.020	0.986 ± 0.009	1 ± 0.044
HLT_Photon15_Cleaned_L1R	1 ± 0.103	0.992 ± 0.008	1 ± 0.137	1 ± 0.184	1 ± 0.021	1 ± 0.421

Conclusions

• Used the official tag and probe software to obtain the electron trigger efficiency.
• We observed that the results for the both the paths studied are statistically consistent.
• We want to confirm that the results won't change much, if we take OR of both the paths to define the passing/failing probe collections. Still we are working on it.

-- LovedeepKaurSaini - 05-Oct-2010