1 / 11

PEM8 Efficiency: L1

PEM8 Efficiency: L1. M.Giordani, L.Santi, G.Pauletta, M.Rossi. PEM8 Efficiency. PEM8 @ L1 == L1_EM8 1Trigger Tower ( η x Φ ≈ 0.2x15 º ) >8GeV Had/Em <0.125 (nominally) <0.0625 (according to P.Wilson)

berk-bird
Download Presentation

PEM8 Efficiency: L1

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. PEM8 Efficiency: L1 M.Giordani, L.Santi, G.Pauletta,M.Rossi Exotic Trigger Meeting

  2. PEM8 Efficiency • PEM8 @ L1 == L1_EM8 • 1Trigger Tower (ηxΦ ≈ 0.2x15º) • >8GeV • Had/Em <0.125 (nominally) <0.0625 (according to P.Wilson) • Data Sample collected by SUSY_DILEPTON trigger (Aug2003-Feb2004) • Used all unbiased paths for PEM8 @ L1-L2 • All paths not requiring PEM8 • CEM4_PEM8_L2_CEM12_PT8 { Exotic Trigger Meeting

  3. PEM ID • From Multilepton Page for 4-20 PT (CDF7345) • Had/em<0.05 • PES 5/9 U >0.65 • PES 5/9 V >0.65 • PAD Track • Eop<3 • Z0<60cm • Isolation (optional) • Pem3x3FitTow>0 • Pem3x3Chisq<10 currently used Exotic Trigger Meeting

  4. Conversion Selection • Similar to CDF6257 and CDF7095 • Preselection • |Δcotθ|<0.15 • Sxy<0.1 • ΔR = √(Φ2+η2) >0.1 • Consider 2 sub-samples • Peak |Δcotθ|<0.03 (Signal+Background) • Sideband |Δcotθ|>0.05 (Background) Signal = true electrons Background = fakes Exotic Trigger Meeting

  5. Fake Fraction in PT bin Fakes are ~20% under the Peak region: ntot = nfake + ne εtot x ntot = εfake x nfake + εe x ne Exotic Trigger Meeting

  6. PEM Track • Close to the beamline PEM tracks cross few SL • most of the tracks w. θ<20º have no COT hits • tracks w. θ<20º = 16% • tracks w. θ<20º and 2 SL (5 hits) = 1.5% Tracks 3706 Tracks θ<20º 603 Tracks θ<20º, 2SL (5 hits) 55 We ask PEM tracks with θ>20º (|η|<1.7) work in progress for including forward tracks (Pheonix,Silicon) Exotic Trigger Meeting

  7. Trigger vs. Simulation • Simulation to reproduce trigger decision PEM candidate (all cuts) 3103 L1_EM8 Real bit 1892 100% L1_EM8 Simulation (had/em<0.125) 1904 +0.6% (had/em<0.0625) 1620 -14% Trigger decision seems to be well reproduced when requiring had/em<0.125 in simulation Exotic Trigger Meeting

  8. Efficiency Definition • Cluster–TriggerTower ηxΦmatching • Trigger Tower pointed by the (η,Φ) of the offline Cluster • Triggered PEM • Offline PEM with corresponding trigger tower satisfying all L1_EM8 requirements (Triggered PEM passing all cuts) (PEM passing all CUTS) • Fitting function used for a global likelihood fit of Peak and Sideband Efficiency = _______________________ ε = 0.5 p2 (1+erf(t)) t = (PT –p0)/2p1 Exotic Trigger Meeting

  9. L1_EM8 Efficiency Had/em<0.125, background subtracted χ2/ndf 13.7/16 p0 5.59±0.67 P1 1.59±1.32 P2 0.98±0.06 Exotic Trigger Meeting

  10. L1_EM8 Efficiency Had/em<0.0625, background subtracted χ2/ndf 14.2/16 p0 5.51±0.72 P1 1.56±1.09 P2 0.94±0.09 Exotic Trigger Meeting

  11. Summary • Real L1_EM8 is comparable • with L1_EM8_Sim (had/em<0.125) within 0.6% • much less with L1_EM8_Sim (had/em<0.0625) within 14% • L1_EM8 Plateau Efficiency • (had/em<0.125) = 0.98±0.06 • (had/em<0.0625) = 0.94±0.09 NEXT • Working on PEM8 L2 efficiency • Cross check procedure using CEM4 eff. (CDF7095) Exotic Trigger Meeting

More Related