TTbar τ + jets:Tau Selection Efficiency Study

William EdsonSUNY at AlbanyAnirvan Sircar

Efficiency Equation Definitions• Selection Signal Efficiency:

εsig = 100 * Σ matched τ’s passing selection / Σ total matched τ’s

• Selection Background Efficiency:εback = 100 * Σ unmatched τ’s passing selection / Σ total matched τ’s

• ID Signal Efficiency εsig = 100 * Σ matched τ’s passing selection / Σ total matched τ’s prior to ID

• ID Background Efficiency εsig = 100 * Σ unmatched τ’s passing selection / Σ total matched τ’s prior to ID

• When denominator = 0, set it to 1 • Tau matching via getTruthMatch function in TNtupleAnalyzer code

– total matched determined during Object Selection– matched/unmatched during tau cut (C7)

Efficiency Study Results J0 – J3

J3 TauID

True matched

τ’s

Unmatched Selected τ’s

Matched Selected

τ’s

Unmatched/Matched

Background Efficiency

Signal Efficiency

Matched τ’s Prior

to ID

ID Signal Efficiency

ID Background

Efficiency

Amount of Events Passing

Selection

LlhLoose 6 1 0 NA 16.7 0 0 0 100 0

LlhMedium,LlhTight,SigLoose,

SigMedium,SigTight

6 0 0 0 0 0 0 0 0 0

•J0, J1 and J3 events all failed the cutflow prior to cut 7 and exhibited no matched taus during object selection

Efficiency Study Results J4

J4 TauID

True matched

τ’s

Unmatched Selected τ’s

Matched Selected

τ’s

Unmatched/Matched

Background Efficiency

Signal Efficiency

Matched τ’s Prior

to ID

ID Signal Efficiency

ID Background

Efficiency

Amount of Events Passing

Selection

LlhLoose 71 19 0 NA 26.8 0 0 0 1900 0

LlhMedium 71 13 0 NA 18.3 0 0 0 1300 0

LlhTight 71 5 0 NA 7.04 0 0 0 500 0

SigLoose 71 13 0 NA 18.3 0 0 0 1300 0

SigMedium 71 10 0 NA 14.1 0 0 0 1000 0

SigTight 71 8 0 NA 11.3 0 0 0 800 0

Efficiency Study Results J5

J5TauID

True matched

τ’s

Unmatched Selected τ’s

Matched Selected

τ’s

Unmatched/Matched

Background Efficiency

Signal Efficiency

Matched τ’s Prior

to ID

ID Signal Efficiency

ID Background

Efficiency

Amount of Events Passing

Selection

LlhLoose 146 45 0 NA 30.8 0 0 0 4500 0

LlhMedium 146 28 0 NA 19.2 0 0 0 2800 0

LlhTight 146 12 0 NA 8.22 0 0 0 1200 0

SigLoose 146 36 0 NA 24.7 0 0 0 3600 0

SigMedium 146 30 0 NA 20.5 0 0 0 3000 0

SigTight 146 8 0 NA 5.48 0 0 0 800 0

Efficiency Study Results FullHad

FullHadTauID

True matched

τ’s

Unmatched Selected τ’s

Matched Selected

τ’s

Unmatched/Matched

Background Efficiency

Signal Efficiency

Matched τ’s Prior

to ID

ID Signal Efficiency

ID Background

Efficiency

Amount of Events Passing

Selection

LlhLoose 3672 987 5 197 26.9 0.136 14 35.7 7050 20

LlhMedium 3672 636 4 159 17.3 0.109 14 28.6 4542 17

LlhTight 3672 252 0 NA 6.86 0 14 0 1800 6

SigLoose 3672 606 3 202 16.5 0.082 14 21.4 4329 20

SigMedium 3672 406 1 406 11.1 0.027 14 7.14 2900 17

SigTight 3672 166 0 NA 4.52 0 14 0 1186 6

Efficiency Study Results Signal

SignalTauID

True matched

τ’s

Unmatched Selected τ’s

Matched Selected

τ’s

Unmatched/Matched

Background Efficiency

Signal Efficiency

Matched τ’s Prior

to ID

ID Signal Efficiency

ID Background

Efficiency

Amount of Events Passing

Selection

LlhLoose 894800 13525 34100 0.397 1.51 3.81 40850 83.5 33.1 2309

LlhMedium 938021 8218 28819 0.285 0.876 3.07 41629 69.2 19.7 1425

LlhTight 938021 3234 16884 0.192 0.345 1.80 41629 40.6 7.77 773

SigLoose 894800 6775 30250 0.224 0.757 3.38 40850 74.1 16.6 1726

SigMedium 938021 4802 25564 0.188 0.512 2.73 41629 61.4 11.5 1075

SigTight 894800 2000 15050 0.132 0.224 1.68 40850 36.8 4.90 773