Susy dilepton trigger calibration of l1 electron primitives
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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.

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Susy dilepton trigger calibration of l1 electron primitives

SUSY_DILEPTON TRIGGER:Calibration of L1 electron primitives

M.Giordani,G.Pauletta,M.Rossi,L.Santi

Udine University

Exotics Meeting – M.Rossi


Electron efficiency
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

DATA SAMPLE

  • SUSY_DILEPTON dataset (Aug’03-June’04) ~140pb-1

  • Unbiased for PEM8

    • paths not requiring PEM

  • Unbiased for CEM4

    • paths not requiring CEM

Exotics Meeting – M.Rossi


Id cuts
ID Cuts

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

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

Exotics Meeting – M.Rossi


Conversion selection
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)

Exotics Meeting – M.Rossi


Offline online matching
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

Exotics Meeting – M.Rossi


Efficiency definition
Efficiency definition

  • Unbinned likelihood fit of Peak & Sidebands

  • Likelihood definition

Exotics Meeting – M.Rossi


Efficiency definition1
Efficiency definition

  • Fitting function (CDF6257)

Exotics Meeting – M.Rossi


Fake fraction
Fake Fraction

PEM

nf ~ 0.15%

CEM

nf ~ 0.05%

Exotics Meeting – M.Rossi


L1 em8 efficiency
L1_EM8 Efficiency

ET0 10.54±0.20

σET 0.13±0.01

K∞ 1.00±0.01

Exotics Meeting – M.Rossi


L1 cem4 pt4 efficiency
L1_CEM4_PT4 Efficiency

ET0 3.85±0.21

σET 0.06±0.02

K∞ 0.89±0.02

Exotics Meeting – M.Rossi


2 dim fit results
2 Dim Fit Results

  • L1_EM8

  • L1_CEM4_PT4

ET0 10.12±0.36

σET 0.13±0.02

PT0 3.53±0.36

σPT 0.03±0.02

K∞ 1.00±0.01

ET0 3.85±0.21

σET 0.06±0.02

PT0 2.29±1.97

σPT 0.01±0.10

K∞ 0.89±0.02

Exotics Meeting – M.Rossi


Back up
Back-up

PEM

CEM

Exotics Meeting – M.Rossi


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