Full Production Analysis so far…

Saminder Dhaliwal

24th August 2005

Resolution Z-> e+ e-

Formula: (Reconstructed E – True E) / (0.1)*(sqrt [True E])

Resolution at different Energy’s

40GeV < E <

50GeV

70GeV < E <

150GeV

50GeV < E <

70GeV

150GeV < E

RMS and Sigma

Full range of E

40GeV < E < 70GeV

50GeV < E < 70GeV

70GeV < E < 150GeV

E > 150GeV

Entries 35376 1684 1776 3056 1612

RMS 4.349 2.195 2.901 5.616 5.403

sigma 1.342 1.118 1.216 1.83 1.565

Producution so far

Filtering events, asking for Lead Jet Pt > 30GeV, Second Jet Pt >

15GeV and eta gap between jets > 3.0 Generate about 10 000 events (with filters)

daily Using about 40GB/day Expect about 52 electrons of which 4-5

have Pt > 20GeV to be generated daily.

No Cuts

Reconstruced: 1 317 437

Matched Truth: 855 811

First Cut: Pt > 20GeV, and “hasTrack”

Reconstruced: 87 971

Matched Truth: 74 680

Second Cut: is egamma object

Reconstruced: 13 890

Matched Truth: 11 595

Third Cut: isEM with TRT

Reconstruced: 179

Matched Truth: 154

Fake rate

Cut 1Pt > 20GeV and hasTrack

Cut 2

egamma

Cut 3

isEM

% of Candidates

6.67 1.05 0.014

% of Fakes 84.9

(15.1% fakes)

83.5

(16.5 % fakes)

86.0

(14.0% fakes)

Conclusions

Need to explore etcone and EoverP cuts further.

Compare isEM analysis with and without TRT