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SUSY_DILEPTON TRIGGER: Calibration of L1 electron primitives. M.Giordani,G.Pauletta, M.Rossi ,L.Santi Udine University. Electron Efficiency. PEM8 L1_EM8 E T (em) ≥ 8 GeV E had /E em ≥ 6.25% CEM4 L1_CEM4_PT4 E T (em) ≥ 4 GeV E had /E em ≤ 12.5% 4-layer XFT track P T ≥ 4.09 GeV/c. - PowerPoint PPT Presentation
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April 7, 2005 Exotics Meeting – M.Rossi 1
SUSY_DILEPTON TRIGGER:Calibration of L1 electron primitives
M.Giordani,G.Pauletta,M.Rossi,L.Santi
Udine University
April 7, 2005 Exotics Meeting – M.Rossi 2
Electron Efficiency
PEM8 L1_EM8
ET(em) ≥ 8 GeV Ehad/Eem ≥ 6.25%
CEM4 L1_CEM4_PT4
ET(em) ≥ 4 GeV Ehad/Eem ≤ 12.5% 4-layer XFT track PT ≥ 4.09 GeV/c
SUSY_DILEPTON dataset (Aug’03-June’04) ~140pb-1
Unbiased for PEM8 paths not requiring PEM
Unbiased for CEM4 paths not requiring CEM
DATA SAMPLE
April 7, 2005 Exotics Meeting – M.Rossi 3
ID Cuts
PEM Ehad/Eem < 0.05 PES 5/9 U > 0.65 PES 5/9 V > 0.65 PAD Track
2 Axial SL w. 5 hits 1 Stereo SL w. 5 hits
Eop < 3 Z0 < 60cm
CEM Ehad/Eem ≤ 0.05
LShr ≤ 0.2 PAD Track
2 Axial SL w. 5 hits 2 Stereo SL w. 5 hits
Eop ≤ 2 -3 ≤ qDx ≤ 1.5 cm Dz ≤ 5 cm Chi2 ≤ 10 Z0 ≤ 60 cm d0 ≤ 0.2 cm Iso ≤ 4 GeV
April 7, 2005 Exotics Meeting – M.Rossi 4
Conversion Selection
Preselection |Δcotθ|<0.15 Sxy<0.1 Conversion tracks in diff TT
Consider 2 sub-samples
Peak |Δcotθ|<0.03
(Signal+Background) Sideband |Δcotθ|>0.05
(Background)
April 7, 2005 Exotics Meeting – M.Rossi 5
Offline-Online matching
Offline Cluster - TriggerTower matching trigger tower pointed by (η,Φ) of the offline cluster
Offline track – XFT track matching SL matching : max 10 pixel between tracks Offline-XFT tracks matched @ 3 XFT SL
XFT track – Trigger Tower matching
April 7, 2005 Exotics Meeting – M.Rossi 6
Efficiency definition
Unbinned likelihood fit of Peak & Sidebands
Likelihood definition
sidebands
peak FIT
f
ssff
nn
ii pL
sidebands1
peak 1TRIG no & ID
sidebands
peak TRIG & ID
f
f
i
i
p
p
April 7, 2005 Exotics Meeting – M.Rossi 7
Efficiency definition
Fitting function (CDF6257)
0
00
22,
TTP
TT
E
TTTT PP
PPfreq
EEfreqKPE
TT
April 7, 2005 Exotics Meeting – M.Rossi 8
Fake Fraction
PEMnf ~ 0.15%
CEMnf ~ 0.05%
April 7, 2005 Exotics Meeting – M.Rossi 9
L1_EM8 Efficiency
ET0 10.54±0.20σET 0.13±0.01K∞ 1.00±0.01
April 7, 2005 Exotics Meeting – M.Rossi 10
L1_CEM4_PT4 Efficiency
ET0 3.85±0.21σET 0.06±0.02K∞ 0.89±0.02
April 7, 2005 Exotics Meeting – M.Rossi 11
2 Dim Fit Results
L1_EM8 L1_CEM4_PT4
ET0 10.12±0.36σET 0.13±0.02PT0 3.53±0.36
σPT 0.03±0.02K∞ 1.00±0.01
ET0 3.85±0.21σET 0.06±0.02PT0 2.29±1.97
σPT 0.01±0.10K∞ 0.89±0.02
April 7, 2005 Exotics Meeting – M.Rossi 12
Back-up
PEM CEM
